44 files changed, 741 insertions, 408 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 431f8b439553..7ec7d88c5999 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -266,6 +266,7 @@ config ACPI_DEBUG_FUNC_TRACE
 
 config ACPI_PCI_SLOT
         tristate "PCI slot detection driver"
+        depends on SYSFS
         default n
         help
           This driver creates entries in /sys/bus/pci/slots/ for all PCI
diff --git a/drivers/acpi/acpica/acevents.h b/drivers/acpi/acpica/acevents.h
index 07e20135f01b..0bba148a2c61 100644
--- a/drivers/acpi/acpica/acevents.h
+++ b/drivers/acpi/acpica/acevents.h
@@ -139,7 +139,7 @@ acpi_status acpi_ev_initialize_op_regions(void);
 acpi_status
 acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
                                u32 function,
-                               acpi_physical_address address,
+                               u32 region_offset,
                                u32 bit_width, acpi_integer * value);
 
 acpi_status
diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h
index 16e5210ae936..3d87362d17ed 100644
--- a/drivers/acpi/acpica/acglobal.h
+++ b/drivers/acpi/acpica/acglobal.h
@@ -362,9 +362,6 @@ extern u8 acpi_gbl_method_executing;
 extern u8 acpi_gbl_abort_method;
 extern u8 acpi_gbl_db_terminate_threads;
 
-ACPI_EXTERN int optind;
-ACPI_EXTERN char *optarg;
-
 ACPI_EXTERN u8 acpi_gbl_db_opt_tables;
 ACPI_EXTERN u8 acpi_gbl_db_opt_stats;
 ACPI_EXTERN u8 acpi_gbl_db_opt_ini_methods;
diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
index 2ec394a328e9..ee986edfa0da 100644
--- a/drivers/acpi/acpica/aclocal.h
+++ b/drivers/acpi/acpica/aclocal.h
@@ -205,6 +205,7 @@ struct acpi_namespace_node {
 #define ANOBJ_METHOD_LOCAL              0x08    /* Node is a method local */
 #define ANOBJ_SUBTREE_HAS_INI           0x10    /* Used to optimize device initialization */
 #define ANOBJ_EVALUATED                 0x20    /* Set on first evaluation of node */
+#define ANOBJ_ALLOCATED_BUFFER          0x40    /* Method AML buffer is dynamic (install_method) */
 
 #define ANOBJ_IS_EXTERNAL               0x08    /* i_aSL only: This object created via External() */
 #define ANOBJ_METHOD_NO_RETVAL          0x10    /* i_aSL only: Method has no return value */
@@ -788,11 +789,14 @@ struct acpi_bit_register_info {
 /* For control registers, both ignored and reserved bits must be preserved */
 
 /*
- * The ACPI spec says to ignore PM1_CTL.SCI_EN (bit 0)
- * but we need to be able to write ACPI_BITREG_SCI_ENABLE directly
- * as a BIOS workaround on some machines.
+ * For PM1 control, the SCI enable bit (bit 0, SCI_EN) is defined by the
+ * ACPI specification to be a "preserved" bit - "OSPM always preserves this
+ * bit position", section 4.7.3.2.1. However, on some machines the OS must
+ * write a one to this bit after resume for the machine to work properly.
+ * To enable this, we no longer attempt to preserve this bit. No machines
+ * are known to fail if the bit is not preserved. (May 2009)
  */
-#define ACPI_PM1_CONTROL_IGNORED_BITS           0x0200  /* Bits 9 */
+#define ACPI_PM1_CONTROL_IGNORED_BITS           0x0200  /* Bit 9 */
 #define ACPI_PM1_CONTROL_RESERVED_BITS          0xC1F8  /* Bits 14-15, 3-8 */
 #define ACPI_PM1_CONTROL_PRESERVED_BITS \
                (ACPI_PM1_CONTROL_IGNORED_BITS | ACPI_PM1_CONTROL_RESERVED_BITS)
diff --git a/drivers/acpi/acpica/acnamesp.h b/drivers/acpi/acpica/acnamesp.h
index 46cb5b46d280..94cdc2b8cb93 100644
--- a/drivers/acpi/acpica/acnamesp.h
+++ b/drivers/acpi/acpica/acnamesp.h
@@ -99,10 +99,19 @@ acpi_ns_walk_namespace(acpi_object_type type,
                        acpi_walk_callback user_function,
                        void *context, void **return_value);
 
-struct acpi_namespace_node *acpi_ns_get_next_node(acpi_object_type type, struct acpi_namespace_node
-                                                  *parent, struct acpi_namespace_node
+struct acpi_namespace_node *acpi_ns_get_next_node(struct acpi_namespace_node
+                                                  *parent,
+                                                  struct acpi_namespace_node
                                                   *child);
 
+struct acpi_namespace_node *acpi_ns_get_next_node_typed(acpi_object_type type,
+                                                        struct
+                                                        acpi_namespace_node
+                                                        *parent,
+                                                        struct
+                                                        acpi_namespace_node
+                                                        *child);
+
 /*
  * nsparse - table parsing
  */
diff --git a/drivers/acpi/acpica/amlcode.h b/drivers/acpi/acpica/amlcode.h
index ff851c5df698..067f967eb389 100644
--- a/drivers/acpi/acpica/amlcode.h
+++ b/drivers/acpi/acpica/amlcode.h
@@ -483,7 +483,7 @@ typedef enum {
 
 #define AML_METHOD_ARG_COUNT        0x07
 #define AML_METHOD_SERIALIZED       0x08
-#define AML_METHOD_SYNCH_LEVEL      0xF0
+#define AML_METHOD_SYNC_LEVEL       0xF0
 
 /* METHOD_FLAGS_ARG_COUNT is not used internally, define additional flags */
 
diff --git a/drivers/acpi/acpica/dsobject.c b/drivers/acpi/acpica/dsobject.c
index dab3f48f0b42..02e6caad4a76 100644
--- a/drivers/acpi/acpica/dsobject.c
+++ b/drivers/acpi/acpica/dsobject.c
@@ -734,7 +734,8 @@ acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
 
                         /* Local ID (0-7) is (AML opcode - base AML_LOCAL_OP) */
 
-                        obj_desc->reference.value = opcode - AML_LOCAL_OP;
+                        obj_desc->reference.value =
+                            ((u32)opcode) - AML_LOCAL_OP;
                         obj_desc->reference.class = ACPI_REFCLASS_LOCAL;
 
 #ifndef ACPI_NO_METHOD_EXECUTION
@@ -754,7 +755,7 @@ acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
 
                         /* Arg ID (0-6) is (AML opcode - base AML_ARG_OP) */
 
-                        obj_desc->reference.value = opcode - AML_ARG_OP;
+                        obj_desc->reference.value = ((u32)opcode) - AML_ARG_OP;
                         obj_desc->reference.class = ACPI_REFCLASS_ARG;
 
 #ifndef ACPI_NO_METHOD_EXECUTION
diff --git a/drivers/acpi/acpica/dsopcode.c b/drivers/acpi/acpica/dsopcode.c
index b4c87b5053e6..584d766e6f12 100644
--- a/drivers/acpi/acpica/dsopcode.c
+++ b/drivers/acpi/acpica/dsopcode.c
@@ -1386,14 +1386,19 @@ acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
 
         case AML_BREAK_POINT_OP:
 
-                /* Call up to the OS service layer to handle this */
-
-                status =
-                    acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
-                                   "Executed AML Breakpoint opcode");
+                /*
+                 * Set the single-step flag. This will cause the debugger (if present)
+                 * to break to the console within the AML debugger at the start of the
+                 * next AML instruction.
+                 */
+                ACPI_DEBUGGER_EXEC(acpi_gbl_cm_single_step = TRUE);
+                ACPI_DEBUGGER_EXEC(acpi_os_printf
+                                   ("**break** Executed AML BreakPoint opcode\n"));
 
-                /* If and when it returns, all done. */
+                /* Call to the OSL in case OS wants a piece of the action */
 
+                status = acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
+                                        "Executed AML Breakpoint opcode");
                 break;
 
         case AML_BREAK_OP:
diff --git a/drivers/acpi/acpica/dswstate.c b/drivers/acpi/acpica/dswstate.c
index 40f92bf7dce5..e46c821cf572 100644
--- a/drivers/acpi/acpica/dswstate.c
+++ b/drivers/acpi/acpica/dswstate.c
@@ -102,7 +102,7 @@ acpi_ds_result_pop(union acpi_operand_object **object,
         /* Return object of the top element and clean that top element result stack */
 
         walk_state->result_count--;
-        index = walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
+        index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
 
         *object = state->results.obj_desc[index];
         if (!*object) {
@@ -186,7 +186,7 @@ acpi_ds_result_push(union acpi_operand_object * object,
 
         /* Assign the address of object to the top free element of result stack */
 
-        index = walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
+        index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
         state->results.obj_desc[index] = object;
         walk_state->result_count++;
 
diff --git a/drivers/acpi/acpica/evregion.c b/drivers/acpi/acpica/evregion.c
index 538d63264555..98c7f9c62653 100644
--- a/drivers/acpi/acpica/evregion.c
+++ b/drivers/acpi/acpica/evregion.c
@@ -275,7 +275,7 @@ acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
  *
  * PARAMETERS:  region_obj          - Internal region object
  *              Function            - Read or Write operation
- *              Address             - Where in the space to read or write
+ *              region_offset       - Where in the region to read or write
  *              bit_width           - Field width in bits (8, 16, 32, or 64)
  *              Value               - Pointer to in or out value, must be
  *                                    full 64-bit acpi_integer
@@ -290,7 +290,7 @@ acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
 acpi_status
 acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
                                u32 function,
-                               acpi_physical_address address,
+                               u32 region_offset,
                                u32 bit_width, acpi_integer * value)
 {
         acpi_status status;
@@ -396,7 +396,8 @@ acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
                           "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
                           &region_obj->region.handler->address_space, handler,
-                          ACPI_FORMAT_NATIVE_UINT(address),
+                          ACPI_FORMAT_NATIVE_UINT(region_obj->region.address +
+                                                  region_offset),
                           acpi_ut_get_region_name(region_obj->region.
                                                   space_id)));
 
@@ -412,8 +413,9 @@ acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
 
         /* Call the handler */
 
-        status = handler(function, address, bit_width, value,
-                         handler_desc->address_space.context,
+        status = handler(function,
+                         (region_obj->region.address + region_offset),
+                         bit_width, value, handler_desc->address_space.context,
                          region_obj2->extra.region_context);
 
         if (ACPI_FAILURE(status)) {
diff --git a/drivers/acpi/acpica/evxfevnt.c b/drivers/acpi/acpica/evxfevnt.c
index d0a080747ec3..4721f58fe42c 100644
--- a/drivers/acpi/acpica/evxfevnt.c
+++ b/drivers/acpi/acpica/evxfevnt.c
@@ -51,7 +51,7 @@
 ACPI_MODULE_NAME("evxfevnt")
 
 /* Local prototypes */
-acpi_status
+static acpi_status
 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
                        struct acpi_gpe_block_info *gpe_block, void *context);
 
@@ -785,7 +785,7 @@ ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
  *              block device. NULL if the GPE is one of the FADT-defined GPEs.
  *
  ******************************************************************************/
-acpi_status
+static acpi_status
 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
                        struct acpi_gpe_block_info *gpe_block, void *context)
 {
diff --git a/drivers/acpi/acpica/exconfig.c b/drivers/acpi/acpica/exconfig.c
index 3deb20a126b2..277fd609611a 100644
--- a/drivers/acpi/acpica/exconfig.c
+++ b/drivers/acpi/acpica/exconfig.c
@@ -47,6 +47,7 @@
 #include "acnamesp.h"
 #include "actables.h"
 #include "acdispat.h"
+#include "acevents.h"
 
 #define _COMPONENT          ACPI_EXECUTER
 ACPI_MODULE_NAME("exconfig")
@@ -57,6 +58,10 @@ acpi_ex_add_table(u32 table_index,
                   struct acpi_namespace_node *parent_node,
                   union acpi_operand_object **ddb_handle);
 
+static acpi_status
+acpi_ex_region_read(union acpi_operand_object *obj_desc,
+                    u32 length, u8 *buffer);
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ex_add_table
@@ -91,6 +96,7 @@ acpi_ex_add_table(u32 table_index,
 
         /* Init the table handle */
 
+        obj_desc->common.flags |= AOPOBJ_DATA_VALID;
         obj_desc->reference.class = ACPI_REFCLASS_TABLE;
         *ddb_handle = obj_desc;
 
@@ -229,6 +235,8 @@ acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
                                        walk_state);
                 if (ACPI_FAILURE(status)) {
                         (void)acpi_ex_unload_table(ddb_handle);
+
+                        acpi_ut_remove_reference(ddb_handle);
                         return_ACPI_STATUS(status);
                 }
         }
@@ -254,6 +262,47 @@ acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_ex_region_read
+ *
+ * PARAMETERS:  obj_desc        - Region descriptor
+ *              Length          - Number of bytes to read
+ *              Buffer          - Pointer to where to put the data
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Read data from an operation region. The read starts from the
+ *              beginning of the region.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
+{
+        acpi_status status;
+        acpi_integer value;
+        u32 region_offset = 0;
+        u32 i;
+
+        /* Bytewise reads */
+
+        for (i = 0; i < length; i++) {
+                status = acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
+                                                        region_offset, 8,
+                                                        &value);
+                if (ACPI_FAILURE(status)) {
+                        return status;
+                }
+
+                *buffer = (u8)value;
+                buffer++;
+                region_offset++;
+        }
+
+        return AE_OK;
+}
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_ex_load_op
  *
  * PARAMETERS:  obj_desc        - Region or Buffer/Field where the table will be
@@ -314,18 +363,23 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc,
                         }
                 }
 
-                /*
-                 * Map the table header and get the actual table length. The region
-                 * length is not guaranteed to be the same as the table length.
-                 */
-                table = acpi_os_map_memory(obj_desc->region.address,
-                                           sizeof(struct acpi_table_header));
+                /* Get the table header first so we can get the table length */
+
+                table = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
                 if (!table) {
                         return_ACPI_STATUS(AE_NO_MEMORY);
                 }
 
+                status =
+                    acpi_ex_region_read(obj_desc,
+                                        sizeof(struct acpi_table_header),
+                                        ACPI_CAST_PTR(u8, table));
                 length = table->length;
-                acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+                ACPI_FREE(table);
+
+                if (ACPI_FAILURE(status)) {
+                        return_ACPI_STATUS(status);
+                }
 
                 /* Must have at least an ACPI table header */
 
@@ -334,10 +388,19 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc,
                 }
 
                 /*
-                 * The memory region is not guaranteed to remain stable and we must
-                 * copy the table to a local buffer. For example, the memory region
-                 * is corrupted after suspend on some machines. Dynamically loaded
-                 * tables are usually small, so this overhead is minimal.
+                 * The original implementation simply mapped the table, with no copy.
+                 * However, the memory region is not guaranteed to remain stable and
+                 * we must copy the table to a local buffer. For example, the memory
+                 * region is corrupted after suspend on some machines. Dynamically
+                 * loaded tables are usually small, so this overhead is minimal.
+                 *
+                 * The latest implementation (5/2009) does not use a mapping at all.
+                 * We use the low-level operation region interface to read the table
+                 * instead of the obvious optimization of using a direct mapping.
+                 * This maintains a consistent use of operation regions across the
+                 * entire subsystem. This is important if additional processing must
+                 * be performed in the (possibly user-installed) operation region
+                 * handler. For example, acpi_exec and ASLTS depend on this.
                  */
 
                 /* Allocate a buffer for the table */
@@ -347,17 +410,16 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc,
                         return_ACPI_STATUS(AE_NO_MEMORY);
                 }
 
-                /* Map the entire table and copy it */
+                /* Read the entire table */
 
-                table = acpi_os_map_memory(obj_desc->region.address, length);
-                if (!table) {
+                status = acpi_ex_region_read(obj_desc, length,
+                                             ACPI_CAST_PTR(u8,
+                                                           table_desc.pointer));
+                if (ACPI_FAILURE(status)) {
                         ACPI_FREE(table_desc.pointer);
-                        return_ACPI_STATUS(AE_NO_MEMORY);
+                        return_ACPI_STATUS(status);
                 }
 
-                ACPI_MEMCPY(table_desc.pointer, table, length);
-                acpi_os_unmap_memory(table, length);
-
                 table_desc.address = obj_desc->region.address;
                 break;
 
@@ -454,6 +516,10 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc,
                 return_ACPI_STATUS(status);
         }
 
+        /* Remove the reference by added by acpi_ex_store above */
+
+        acpi_ut_remove_reference(ddb_handle);
+
         /* Invoke table handler if present */
 
         if (acpi_gbl_table_handler) {
@@ -495,13 +561,18 @@ acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 
         /*
          * Validate the handle
-         * Although the handle is partially validated in acpi_ex_reconfiguration(),
+         * Although the handle is partially validated in acpi_ex_reconfiguration()
          * when it calls acpi_ex_resolve_operands(), the handle is more completely
          * validated here.
+         *
+         * Handle must be a valid operand object of type reference. Also, the
+         * ddb_handle must still be marked valid (table has not been previously
+         * unloaded)
          */
         if ((!ddb_handle) ||
             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
-            (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE)) {
+            (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
+            (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
                 return_ACPI_STATUS(AE_BAD_PARAMETER);
         }
 
@@ -509,6 +580,12 @@ acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 
         table_index = table_desc->reference.value;
 
+        /* Ensure the table is still loaded */
+
+        if (!acpi_tb_is_table_loaded(table_index)) {
+                return_ACPI_STATUS(AE_NOT_EXIST);
+        }
+
         /* Invoke table handler if present */
 
         if (acpi_gbl_table_handler) {
@@ -530,8 +607,10 @@ acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
         (void)acpi_tb_release_owner_id(table_index);
         acpi_tb_set_table_loaded_flag(table_index, FALSE);
 
-        /* Table unloaded, remove a reference to the ddb_handle object */
-
-        acpi_ut_remove_reference(ddb_handle);
+        /*
+         * Invalidate the handle. We do this because the handle may be stored
+         * in a named object and may not be actually deleted until much later.
+         */
+        ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
         return_ACPI_STATUS(AE_OK);
 }
diff --git a/drivers/acpi/acpica/excreate.c b/drivers/acpi/acpica/excreate.c
index a57ad2564ab0..02b25d233d99 100644
--- a/drivers/acpi/acpica/excreate.c
+++ b/drivers/acpi/acpica/excreate.c
@@ -502,7 +502,7 @@ acpi_ex_create_method(u8 * aml_start,
                  * ACPI 2.0: sync_level = sync_level in method declaration
                  */
                 obj_desc->method.sync_level = (u8)
-                    ((method_flags & AML_METHOD_SYNCH_LEVEL) >> 4);
+                    ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
         }
 
         /* Attach the new object to the method Node */
diff --git a/drivers/acpi/acpica/exdump.c b/drivers/acpi/acpica/exdump.c
index 89d141fdae0b..ec524614e708 100644
--- a/drivers/acpi/acpica/exdump.c
+++ b/drivers/acpi/acpica/exdump.c
@@ -120,9 +120,11 @@ static struct acpi_exdump_info acpi_ex_dump_event[2] = {
         {ACPI_EXD_POINTER, ACPI_EXD_OFFSET(event.os_semaphore), "OsSemaphore"}
 };
 
-static struct acpi_exdump_info acpi_ex_dump_method[8] = {
+static struct acpi_exdump_info acpi_ex_dump_method[9] = {
         {ACPI_EXD_INIT, ACPI_EXD_TABLE_SIZE(acpi_ex_dump_method), NULL},
-        {ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.param_count), "ParamCount"},
+        {ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.method_flags), "Method Flags"},
+        {ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.param_count),
+         "Parameter Count"},
         {ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.sync_level), "Sync Level"},
         {ACPI_EXD_POINTER, ACPI_EXD_OFFSET(method.mutex), "Mutex"},
         {ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.owner_id), "Owner Id"},
diff --git a/drivers/acpi/acpica/exfldio.c b/drivers/acpi/acpica/exfldio.c
index 99cee61e655d..d4075b821021 100644
--- a/drivers/acpi/acpica/exfldio.c
+++ b/drivers/acpi/acpica/exfldio.c
@@ -222,7 +222,7 @@ acpi_ex_access_region(union acpi_operand_object *obj_desc,
 {
         acpi_status status;
         union acpi_operand_object *rgn_desc;
-        acpi_physical_address address;
+        u32 region_offset;
 
         ACPI_FUNCTION_TRACE(ex_access_region);
 
@@ -243,7 +243,7 @@ acpi_ex_access_region(union acpi_operand_object *obj_desc,
          * 3) The current offset into the field
          */
         rgn_desc = obj_desc->common_field.region_obj;
-        address = rgn_desc->region.address +
+        region_offset =
             obj_desc->common_field.base_byte_offset + field_datum_byte_offset;
 
         if ((function & ACPI_IO_MASK) == ACPI_READ) {
@@ -260,16 +260,18 @@ acpi_ex_access_region(union acpi_operand_object *obj_desc,
                               obj_desc->common_field.access_byte_width,
                               obj_desc->common_field.base_byte_offset,
                               field_datum_byte_offset, ACPI_CAST_PTR(void,
-                                                                     address)));
+                                                                     (rgn_desc->
+                                                                      region.
+                                                                      address +
+                                                                      region_offset))));
 
         /* Invoke the appropriate address_space/op_region handler */
 
-        status = acpi_ev_address_space_dispatch(rgn_desc, function,
-                                                address,
-                                                ACPI_MUL_8(obj_desc->
-                                                           common_field.
-                                                           access_byte_width),
-                                                value);
+        status =
+            acpi_ev_address_space_dispatch(rgn_desc, function, region_offset,
+                                           ACPI_MUL_8(obj_desc->common_field.
+                                                      access_byte_width),
+                                           value);
 
         if (ACPI_FAILURE(status)) {
                 if (status == AE_NOT_IMPLEMENTED) {
diff --git a/drivers/acpi/acpica/exmutex.c b/drivers/acpi/acpica/exmutex.c
index d301c1f363ef..2f0114202b05 100644
--- a/drivers/acpi/acpica/exmutex.c
+++ b/drivers/acpi/acpica/exmutex.c
@@ -83,6 +83,15 @@ void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc)
 
         if (obj_desc->mutex.prev) {
                 (obj_desc->mutex.prev)->mutex.next = obj_desc->mutex.next;
+
+                /*
+                 * Migrate the previous sync level associated with this mutex to the
+                 * previous mutex on the list so that it may be preserved. This handles
+                 * the case where several mutexes have been acquired at the same level,
+                 * but are not released in opposite order.
+                 */
+                (obj_desc->mutex.prev)->mutex.original_sync_level =
+                    obj_desc->mutex.original_sync_level;
         } else {
                 thread->acquired_mutex_list = obj_desc->mutex.next;
         }
@@ -349,6 +358,7 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
                       struct acpi_walk_state *walk_state)
 {
         acpi_status status = AE_OK;
+        u8 previous_sync_level;
 
         ACPI_FUNCTION_TRACE(ex_release_mutex);
 
@@ -373,11 +383,12 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
              walk_state->thread->thread_id)
             && (obj_desc != acpi_gbl_global_lock_mutex)) {
                 ACPI_ERROR((AE_INFO,
-                            "Thread %lX cannot release Mutex [%4.4s] acquired by thread %lX",
-                            (unsigned long)walk_state->thread->thread_id,
+                            "Thread %p cannot release Mutex [%4.4s] acquired by thread %p",
+                            ACPI_CAST_PTR(void, walk_state->thread->thread_id),
                             acpi_ut_get_node_name(obj_desc->mutex.node),
-                            (unsigned long)obj_desc->mutex.owner_thread->
-                            thread_id));
+                            ACPI_CAST_PTR(void,
+                                          obj_desc->mutex.owner_thread->
+                                          thread_id)));
                 return_ACPI_STATUS(AE_AML_NOT_OWNER);
         }
 
@@ -391,10 +402,14 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
         }
 
         /*
-         * The sync level of the mutex must be less than or equal to the current
-         * sync level
+         * The sync level of the mutex must be equal to the current sync level. In
+         * other words, the current level means that at least one mutex at that
+         * level is currently being held. Attempting to release a mutex of a
+         * different level can only mean that the mutex ordering rule is being
+         * violated. This behavior is clarified in ACPI 4.0 specification.
          */
-        if (obj_desc->mutex.sync_level > walk_state->thread->current_sync_level) {
+        if (obj_desc->mutex.sync_level !=
+            walk_state->thread->current_sync_level) {
                 ACPI_ERROR((AE_INFO,
                             "Cannot release Mutex [%4.4s], SyncLevel mismatch: mutex %d current %d",
                             acpi_ut_get_node_name(obj_desc->mutex.node),
@@ -403,14 +418,24 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
                 return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
         }
 
+        /*
+         * Get the previous sync_level from the head of the acquired mutex list.
+         * This handles the case where several mutexes at the same level have been
+         * acquired, but are not released in reverse order.
+         */
+        previous_sync_level =
+            walk_state->thread->acquired_mutex_list->mutex.original_sync_level;
+
         status = acpi_ex_release_mutex_object(obj_desc);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
 
         if (obj_desc->mutex.acquisition_depth == 0) {
 
-                /* Restore the original sync_level */
+                /* Restore the previous sync_level */
 
-                walk_state->thread->current_sync_level =
-                    obj_desc->mutex.original_sync_level;
+                walk_state->thread->current_sync_level = previous_sync_level;
         }
         return_ACPI_STATUS(status);
 }
diff --git a/drivers/acpi/acpica/exstore.c b/drivers/acpi/acpica/exstore.c
index 90d606196c99..6efd07a4f779 100644
--- a/drivers/acpi/acpica/exstore.c
+++ b/drivers/acpi/acpica/exstore.c
@@ -193,10 +193,12 @@ acpi_ex_do_debug_object(union acpi_operand_object *source_desc,
 
                 case ACPI_REFCLASS_TABLE:
 
+                        /* Case for ddb_handle */
+
                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
                                               "Table Index 0x%X\n",
                                               source_desc->reference.value));
-                        break;
+                        return;
 
                 default:
                         break;
diff --git a/drivers/acpi/acpica/hwregs.c b/drivers/acpi/acpica/hwregs.c
index 7b2fb602b5cb..23d5505cb1f7 100644
--- a/drivers/acpi/acpica/hwregs.c
+++ b/drivers/acpi/acpica/hwregs.c
@@ -81,9 +81,9 @@ acpi_status acpi_hw_clear_acpi_status(void)
 
         ACPI_FUNCTION_TRACE(hw_clear_acpi_status);
 
-        ACPI_DEBUG_PRINT((ACPI_DB_IO, "About to write %04X to %0llX\n",
+        ACPI_DEBUG_PRINT((ACPI_DB_IO, "About to write %04X to %8.8X%8.8X\n",
                           ACPI_BITMASK_ALL_FIXED_STATUS,
-                          acpi_gbl_xpm1a_status.address));
+                          ACPI_FORMAT_UINT64(acpi_gbl_xpm1a_status.address)));
 
         lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
 
diff --git a/drivers/acpi/acpica/nsalloc.c b/drivers/acpi/acpica/nsalloc.c
index aceb93111967..efc971ab7d65 100644
--- a/drivers/acpi/acpica/nsalloc.c
+++ b/drivers/acpi/acpica/nsalloc.c
@@ -334,9 +334,7 @@ void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
 
                 /* Get the next node in this scope (NULL if none) */
 
-                child_node =
-                    acpi_ns_get_next_node(ACPI_TYPE_ANY, parent_node,
-                                          child_node);
+                child_node = acpi_ns_get_next_node(parent_node, child_node);
                 if (child_node) {
 
                         /* Found a child node - detach any attached object */
@@ -345,8 +343,7 @@ void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
 
                         /* Check if this node has any children */
 
-                        if (acpi_ns_get_next_node
-                            (ACPI_TYPE_ANY, child_node, NULL)) {
+                        if (child_node->child) {
                                 /*
                                  * There is at least one child of this node,
                                  * visit the node
@@ -432,9 +429,7 @@ void acpi_ns_delete_namespace_by_owner(acpi_owner_id owner_id)
                  * Get the next child of this parent node. When child_node is NULL,
                  * the first child of the parent is returned
                  */
-                child_node =
-                    acpi_ns_get_next_node(ACPI_TYPE_ANY, parent_node,
-                                          child_node);
+                child_node = acpi_ns_get_next_node(parent_node, child_node);
 
                 if (deletion_node) {
                         acpi_ns_delete_children(deletion_node);
@@ -452,8 +447,7 @@ void acpi_ns_delete_namespace_by_owner(acpi_owner_id owner_id)
 
                         /* Check if this node has any children */
 
-                        if (acpi_ns_get_next_node
-                            (ACPI_TYPE_ANY, child_node, NULL)) {
+                        if (child_node->child) {
                                 /*
                                  * There is at least one child of this node,
                                  * visit the node
diff --git a/drivers/acpi/acpica/nsnames.c b/drivers/acpi/acpica/nsnames.c
index ae3dc10a7e81..af8e6bcee07e 100644
--- a/drivers/acpi/acpica/nsnames.c
+++ b/drivers/acpi/acpica/nsnames.c
@@ -149,7 +149,7 @@ char *acpi_ns_get_external_pathname(struct acpi_namespace_node *node)
 
         name_buffer = ACPI_ALLOCATE_ZEROED(size);
         if (!name_buffer) {
-                ACPI_ERROR((AE_INFO, "Allocation failure"));
+                ACPI_ERROR((AE_INFO, "Could not allocate %u bytes", (u32)size));
                 return_PTR(NULL);
         }
 
diff --git a/drivers/acpi/acpica/nsobject.c b/drivers/acpi/acpica/nsobject.c
index 3eb20bfda9d8..60f3af08d28c 100644
--- a/drivers/acpi/acpica/nsobject.c
+++ b/drivers/acpi/acpica/nsobject.c
@@ -213,6 +213,15 @@ void acpi_ns_detach_object(struct acpi_namespace_node *node)
                 return_VOID;
         }
 
+        if (node->flags & ANOBJ_ALLOCATED_BUFFER) {
+
+                /* Free the dynamic aml buffer */
+
+                if (obj_desc->common.type == ACPI_TYPE_METHOD) {
+                        ACPI_FREE(obj_desc->method.aml_start);
+                }
+        }
+
         /* Clear the entry in all cases */
 
         node->object = NULL;
diff --git a/drivers/acpi/acpica/nspredef.c b/drivers/acpi/acpica/nspredef.c
index d9e8cbc6e679..7f8e066b12a3 100644
--- a/drivers/acpi/acpica/nspredef.c
+++ b/drivers/acpi/acpica/nspredef.c
@@ -144,7 +144,7 @@ acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
 
         pathname = acpi_ns_get_external_pathname(node);
         if (!pathname) {
-                pathname = ACPI_CAST_PTR(char, predefined->info.name);
+                return AE_OK;   /* Could not get pathname, ignore */
         }
 
         /*
@@ -230,10 +230,7 @@ acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
         }
 
       exit:
-        if (pathname != predefined->info.name) {
-                ACPI_FREE(pathname);
-        }
-
+        ACPI_FREE(pathname);
         return (status);
 }
 
diff --git a/drivers/acpi/acpica/nssearch.c b/drivers/acpi/acpica/nssearch.c
index f9b4f51bf8f2..7e865639a928 100644
--- a/drivers/acpi/acpica/nssearch.c
+++ b/drivers/acpi/acpica/nssearch.c
@@ -45,6 +45,10 @@
 #include "accommon.h"
 #include "acnamesp.h"
 
+#ifdef ACPI_ASL_COMPILER
+#include "amlcode.h"
+#endif
+
 #define _COMPONENT          ACPI_NAMESPACE
 ACPI_MODULE_NAME("nssearch")
 
diff --git a/drivers/acpi/acpica/nswalk.c b/drivers/acpi/acpica/nswalk.c
index 83e3aa6d4b9b..35539df5c75d 100644
--- a/drivers/acpi/acpica/nswalk.c
+++ b/drivers/acpi/acpica/nswalk.c
@@ -52,8 +52,7 @@ ACPI_MODULE_NAME("nswalk")
  *
  * FUNCTION:    acpi_ns_get_next_node
  *
- * PARAMETERS:  Type                - Type of node to be searched for
- *              parent_node         - Parent node whose children we are
+ * PARAMETERS:  parent_node         - Parent node whose children we are
  *                                    getting
  *              child_node          - Previous child that was found.
  *                                    The NEXT child will be returned
@@ -66,27 +65,68 @@ ACPI_MODULE_NAME("nswalk")
  *              within Scope is returned.
  *
  ******************************************************************************/
-struct acpi_namespace_node *acpi_ns_get_next_node(acpi_object_type type, struct acpi_namespace_node
-                                                  *parent_node, struct acpi_namespace_node
+struct acpi_namespace_node *acpi_ns_get_next_node(struct acpi_namespace_node
+                                                  *parent_node,
+                                                  struct acpi_namespace_node
                                                   *child_node)
 {
-        struct acpi_namespace_node *next_node = NULL;
-
         ACPI_FUNCTION_ENTRY();
 
         if (!child_node) {
 
                 /* It's really the parent's _scope_ that we want */
 
-                next_node = parent_node->child;
+                return parent_node->child;
         }
 
-        else {
-                /* Start search at the NEXT node */
-
-                next_node = acpi_ns_get_next_valid_node(child_node);
+        /*
+         * Get the next node.
+         *
+         * If we are at the end of this peer list, return NULL
+         */
+        if (child_node->flags & ANOBJ_END_OF_PEER_LIST) {
+                return NULL;
         }
 
+        /* Otherwise just return the next peer */
+
+        return child_node->peer;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_get_next_node_typed
+ *
+ * PARAMETERS:  Type                - Type of node to be searched for
+ *              parent_node         - Parent node whose children we are
+ *                                    getting
+ *              child_node          - Previous child that was found.
+ *                                    The NEXT child will be returned
+ *
+ * RETURN:      struct acpi_namespace_node - Pointer to the NEXT child or NULL if
+ *                                    none is found.
+ *
+ * DESCRIPTION: Return the next peer node within the namespace.  If Handle
+ *              is valid, Scope is ignored.  Otherwise, the first node
+ *              within Scope is returned.
+ *
+ ******************************************************************************/
+
+struct acpi_namespace_node *acpi_ns_get_next_node_typed(acpi_object_type type,
+                                                        struct
+                                                        acpi_namespace_node
+                                                        *parent_node,
+                                                        struct
+                                                        acpi_namespace_node
+                                                        *child_node)
+{
+        struct acpi_namespace_node *next_node = NULL;
+
+        ACPI_FUNCTION_ENTRY();
+
+        next_node = acpi_ns_get_next_node(parent_node, child_node);
+
+
         /* If any type is OK, we are done */
 
         if (type == ACPI_TYPE_ANY) {
@@ -186,9 +226,7 @@ acpi_ns_walk_namespace(acpi_object_type type,
                 /* Get the next node in this scope.  Null if not found */
 
                 status = AE_OK;
-                child_node =
-                    acpi_ns_get_next_node(ACPI_TYPE_ANY, parent_node,
-                                          child_node);
+                child_node = acpi_ns_get_next_node(parent_node, child_node);
                 if (child_node) {
 
                         /* Found next child, get the type if we are not searching for ANY */
@@ -269,8 +307,7 @@ acpi_ns_walk_namespace(acpi_object_type type,
                          * function has specified that the maximum depth has been reached.
                          */
                         if ((level < max_depth) && (status != AE_CTRL_DEPTH)) {
-                                if (acpi_ns_get_next_node
-                                    (ACPI_TYPE_ANY, child_node, NULL)) {
+                                if (child_node->child) {
 
                                         /* There is at least one child of this node, visit it */
 
diff --git a/drivers/acpi/acpica/nsxfname.c b/drivers/acpi/acpica/nsxfname.c
index 9589fea24997..f23593d6add4 100644
--- a/drivers/acpi/acpica/nsxfname.c
+++ b/drivers/acpi/acpica/nsxfname.c
@@ -45,6 +45,8 @@
 #include <acpi/acpi.h>
 #include "accommon.h"
 #include "acnamesp.h"
+#include "acparser.h"
+#include "amlcode.h"
 
 #define _COMPONENT          ACPI_NAMESPACE
 ACPI_MODULE_NAME("nsxfname")
@@ -358,3 +360,151 @@ acpi_get_object_info(acpi_handle handle, struct acpi_buffer * buffer)
 }
 
 ACPI_EXPORT_SYMBOL(acpi_get_object_info)
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_install_method
+ *
+ * PARAMETERS:  Buffer         - An ACPI table containing one control method
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install a control method into the namespace. If the method
+ *              name already exists in the namespace, it is overwritten. The
+ *              input buffer must contain a valid DSDT or SSDT containing a
+ *              single control method.
+ *
+ ******************************************************************************/
+acpi_status acpi_install_method(u8 *buffer)
+{
+        struct acpi_table_header *table =
+            ACPI_CAST_PTR(struct acpi_table_header, buffer);
+        u8 *aml_buffer;
+        u8 *aml_start;
+        char *path;
+        struct acpi_namespace_node *node;
+        union acpi_operand_object *method_obj;
+        struct acpi_parse_state parser_state;
+        u32 aml_length;
+        u16 opcode;
+        u8 method_flags;
+        acpi_status status;
+
+        /* Parameter validation */
+
+        if (!buffer) {
+                return AE_BAD_PARAMETER;
+        }
+
+        /* Table must be a DSDT or SSDT */
+
+        if (!ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) &&
+            !ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) {
+                return AE_BAD_HEADER;
+        }
+
+        /* First AML opcode in the table must be a control method */
+
+        parser_state.aml = buffer + sizeof(struct acpi_table_header);
+        opcode = acpi_ps_peek_opcode(&parser_state);
+        if (opcode != AML_METHOD_OP) {
+                return AE_BAD_PARAMETER;
+        }
+
+        /* Extract method information from the raw AML */
+
+        parser_state.aml += acpi_ps_get_opcode_size(opcode);
+        parser_state.pkg_end = acpi_ps_get_next_package_end(&parser_state);
+        path = acpi_ps_get_next_namestring(&parser_state);
+        method_flags = *parser_state.aml++;
+        aml_start = parser_state.aml;
+        aml_length = ACPI_PTR_DIFF(parser_state.pkg_end, aml_start);
+
+        /*
+         * Allocate resources up-front. We don't want to have to delete a new
+         * node from the namespace if we cannot allocate memory.
+         */
+        aml_buffer = ACPI_ALLOCATE(aml_length);
+        if (!aml_buffer) {
+                return AE_NO_MEMORY;
+        }
+
+        method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
+        if (!method_obj) {
+                ACPI_FREE(aml_buffer);
+                return AE_NO_MEMORY;
+        }
+
+        /* Lock namespace for acpi_ns_lookup, we may be creating a new node */
+
+        status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
+        if (ACPI_FAILURE(status)) {
+                goto error_exit;
+        }
+
+        /* The lookup either returns an existing node or creates a new one */
+
+        status =
+            acpi_ns_lookup(NULL, path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
+                           ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND,
+                           NULL, &node);
+
+        (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
+
+        if (ACPI_FAILURE(status)) {     /* ns_lookup */
+                if (status != AE_ALREADY_EXISTS) {
+                        goto error_exit;
+                }
+
+                /* Node existed previously, make sure it is a method node */
+
+                if (node->type != ACPI_TYPE_METHOD) {
+                        status = AE_TYPE;
+                        goto error_exit;
+                }
+        }
+
+        /* Copy the method AML to the local buffer */
+
+        ACPI_MEMCPY(aml_buffer, aml_start, aml_length);
+
+        /* Initialize the method object with the new method's information */
+
+        method_obj->method.aml_start = aml_buffer;
+        method_obj->method.aml_length = aml_length;
+
+        method_obj->method.param_count = (u8)
+            (method_flags & AML_METHOD_ARG_COUNT);
+
+        method_obj->method.method_flags = (u8)
+            (method_flags & ~AML_METHOD_ARG_COUNT);
+
+        if (method_flags & AML_METHOD_SERIALIZED) {
+                method_obj->method.sync_level = (u8)
+                    ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
+        }
+
+        /*
+         * Now that it is complete, we can attach the new method object to
+         * the method Node (detaches/deletes any existing object)
+         */
+        status = acpi_ns_attach_object(node, method_obj, ACPI_TYPE_METHOD);
+
+        /*
+         * Flag indicates AML buffer is dynamic, must be deleted later.
+         * Must be set only after attach above.
+         */
+        node->flags |= ANOBJ_ALLOCATED_BUFFER;
+
+        /* Remove local reference to the method object */
+
+        acpi_ut_remove_reference(method_obj);
+        return status;
+
+error_exit:
+
+        ACPI_FREE(aml_buffer);
+        ACPI_FREE(method_obj);
+        return status;
+}
+ACPI_EXPORT_SYMBOL(acpi_install_method)
diff --git a/drivers/acpi/acpica/nsxfobj.c b/drivers/acpi/acpica/nsxfobj.c
index 1c7efc15225f..4071bad4458e 100644
--- a/drivers/acpi/acpica/nsxfobj.c
+++ b/drivers/acpi/acpica/nsxfobj.c
@@ -162,6 +162,7 @@ ACPI_EXPORT_SYMBOL(acpi_get_type)
 acpi_status acpi_get_parent(acpi_handle handle, acpi_handle * ret_handle)
 {
         struct acpi_namespace_node *node;
+        struct acpi_namespace_node *parent_node;
         acpi_status status;
 
         if (!ret_handle) {
@@ -189,12 +190,12 @@ acpi_status acpi_get_parent(acpi_handle handle, acpi_handle * ret_handle)
 
         /* Get the parent entry */
 
-        *ret_handle =
-            acpi_ns_convert_entry_to_handle(acpi_ns_get_parent_node(node));
+        parent_node = acpi_ns_get_parent_node(node);
+        *ret_handle = acpi_ns_convert_entry_to_handle(parent_node);
 
         /* Return exception if parent is null */
 
-        if (!acpi_ns_get_parent_node(node)) {
+        if (!parent_node) {
                 status = AE_NULL_ENTRY;
         }
 
@@ -268,7 +269,7 @@ acpi_get_next_object(acpi_object_type type,
 
         /* Internal function does the real work */
 
-        node = acpi_ns_get_next_node(type, parent_node, child_node);
+        node = acpi_ns_get_next_node_typed(type, parent_node, child_node);
         if (!node) {
                 status = AE_NOT_FOUND;
                 goto unlock_and_exit;
diff --git a/drivers/acpi/acpica/rscalc.c b/drivers/acpi/acpica/rscalc.c
index 88b5a2c4814d..3c4dcc3d1069 100644
--- a/drivers/acpi/acpica/rscalc.c
+++ b/drivers/acpi/acpica/rscalc.c
@@ -547,7 +547,7 @@ acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
 
                 if (!package_element ||
                     (package_element->common.type != ACPI_TYPE_PACKAGE)) {
-                        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
+                        return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
                 }
 
                 /*
@@ -593,9 +593,6 @@ acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
                         } else {
                                 temp_size_needed +=
                                     acpi_ns_get_pathname_length((*sub_object_list)->reference.node);
-                                if (!temp_size_needed) {
-                                        return_ACPI_STATUS(AE_BAD_PARAMETER);
-                                }
                         }
                 } else {
                         /*
diff --git a/drivers/acpi/acpica/rsxface.c b/drivers/acpi/acpica/rsxface.c
index 69a2aa5b5d83..395212bcd19b 100644
--- a/drivers/acpi/acpica/rsxface.c
+++ b/drivers/acpi/acpica/rsxface.c
@@ -338,13 +338,17 @@ acpi_resource_to_address64(struct acpi_resource *resource,
         switch (resource->type) {
         case ACPI_RESOURCE_TYPE_ADDRESS16:
 
-                address16 = (struct acpi_resource_address16 *)&resource->data;
+                address16 =
+                    ACPI_CAST_PTR(struct acpi_resource_address16,
+                                  &resource->data);
                 ACPI_COPY_ADDRESS(out, address16);
                 break;
 
         case ACPI_RESOURCE_TYPE_ADDRESS32:
 
-                address32 = (struct acpi_resource_address32 *)&resource->data;
+                address32 =
+                    ACPI_CAST_PTR(struct acpi_resource_address32,
+                                  &resource->data);
                 ACPI_COPY_ADDRESS(out, address32);
                 break;
 
diff --git a/drivers/acpi/acpica/tbfadt.c b/drivers/acpi/acpica/tbfadt.c
index 71e655d14cb0..82b02dcb942e 100644
--- a/drivers/acpi/acpica/tbfadt.c
+++ b/drivers/acpi/acpica/tbfadt.c
@@ -284,9 +284,9 @@ void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
         if (length > sizeof(struct acpi_table_fadt)) {
                 ACPI_WARNING((AE_INFO,
                               "FADT (revision %u) is longer than ACPI 2.0 version, "
-                              "truncating length 0x%X to 0x%zX",
-                              table->revision, (unsigned)length,
-                              sizeof(struct acpi_table_fadt)));
+                              "truncating length 0x%X to 0x%X",
+                              table->revision, length,
+                              (u32)sizeof(struct acpi_table_fadt)));
         }
 
         /* Clear the entire local FADT */
@@ -441,7 +441,7 @@ static void acpi_tb_convert_fadt(void)
                                                                    &acpi_gbl_FADT,
                                                                    fadt_info_table
                                                                    [i].length),
-                                                     address32);
+                                                     (u64) address32);
                 }
         }
 }
@@ -469,7 +469,6 @@ static void acpi_tb_convert_fadt(void)
 static void acpi_tb_validate_fadt(void)
 {
         char *name;
-        u32 *address32;
         struct acpi_generic_address *address64;
         u8 length;
         u32 i;
@@ -505,15 +504,12 @@ static void acpi_tb_validate_fadt(void)
 
         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
                 /*
-                 * Generate pointers to the 32-bit and 64-bit addresses, get the
-                 * register length (width), and the register name
+                 * Generate pointer to the 64-bit address, get the register
+                 * length (width) and the register name
                  */
                 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
                                          &acpi_gbl_FADT,
                                          fadt_info_table[i].address64);
-                address32 =
-                    ACPI_ADD_PTR(u32, &acpi_gbl_FADT,
-                                 fadt_info_table[i].address32);
                 length =
                     *ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
                                   fadt_info_table[i].length);
diff --git a/drivers/acpi/acpica/tbinstal.c b/drivers/acpi/acpica/tbinstal.c
index f865d5a096de..63e82329a9e8 100644
--- a/drivers/acpi/acpica/tbinstal.c
+++ b/drivers/acpi/acpica/tbinstal.c
@@ -472,7 +472,7 @@ acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index)
          * lock may block, and also since the execution of a namespace walk
          * must be allowed to use the interpreter.
          */
-        acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
+        (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
         status = acpi_ut_acquire_write_lock(&acpi_gbl_namespace_rw_lock);
 
         acpi_ns_delete_namespace_by_owner(owner_id);
diff --git a/drivers/acpi/acpica/utcopy.c b/drivers/acpi/acpica/utcopy.c
index 919624f123d5..0f0c64bf8ac9 100644
--- a/drivers/acpi/acpica/utcopy.c
+++ b/drivers/acpi/acpica/utcopy.c
@@ -676,6 +676,7 @@ acpi_ut_copy_simple_object(union acpi_operand_object *source_desc,
 {
         u16 reference_count;
         union acpi_operand_object *next_object;
+        acpi_status status;
 
         /* Save fields from destination that we don't want to overwrite */
 
@@ -768,6 +769,28 @@ acpi_ut_copy_simple_object(union acpi_operand_object *source_desc,
                 }
                 break;
 
+                /*
+                 * For Mutex and Event objects, we cannot simply copy the underlying
+                 * OS object. We must create a new one.
+                 */
+        case ACPI_TYPE_MUTEX:
+
+                status = acpi_os_create_mutex(&dest_desc->mutex.os_mutex);
+                if (ACPI_FAILURE(status)) {
+                        return status;
+                }
+                break;
+
+        case ACPI_TYPE_EVENT:
+
+                status = acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0,
+                                                  &dest_desc->event.
+                                                  os_semaphore);
+                if (ACPI_FAILURE(status)) {
+                        return status;
+                }
+                break;
+
         default:
                 /* Nothing to do for other simple objects */
                 break;
diff --git a/drivers/acpi/acpica/utdebug.c b/drivers/acpi/acpica/utdebug.c
index 38821f53042c..527d729f6815 100644
--- a/drivers/acpi/acpica/utdebug.c
+++ b/drivers/acpi/acpica/utdebug.c
@@ -179,9 +179,9 @@ acpi_debug_print(u32 requested_debug_level,
         if (thread_id != acpi_gbl_prev_thread_id) {
                 if (ACPI_LV_THREADS & acpi_dbg_level) {
                         acpi_os_printf
-                            ("\n**** Context Switch from TID %lX to TID %lX ****\n\n",
-                             (unsigned long)acpi_gbl_prev_thread_id,
-                             (unsigned long)thread_id);
+                            ("\n**** Context Switch from TID %p to TID %p ****\n\n",
+                             ACPI_CAST_PTR(void, acpi_gbl_prev_thread_id),
+                             ACPI_CAST_PTR(void, thread_id));
                 }
 
                 acpi_gbl_prev_thread_id = thread_id;
@@ -194,7 +194,7 @@ acpi_debug_print(u32 requested_debug_level,
         acpi_os_printf("%8s-%04ld ", module_name, line_number);
 
         if (ACPI_LV_THREADS & acpi_dbg_level) {
-                acpi_os_printf("[%04lX] ", (unsigned long)thread_id);
+                acpi_os_printf("[%p] ", ACPI_CAST_PTR(void, thread_id));
         }
 
         acpi_os_printf("[%02ld] %-22.22s: ",
diff --git a/drivers/acpi/acpica/utdelete.c b/drivers/acpi/acpica/utdelete.c
index a5ee23bc4f55..bc1710315088 100644
--- a/drivers/acpi/acpica/utdelete.c
+++ b/drivers/acpi/acpica/utdelete.c
@@ -75,6 +75,7 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
         union acpi_operand_object *handler_desc;
         union acpi_operand_object *second_desc;
         union acpi_operand_object *next_desc;
+        union acpi_operand_object **last_obj_ptr;
 
         ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object);
 
@@ -223,6 +224,26 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
                          */
                         handler_desc = object->region.handler;
                         if (handler_desc) {
+                                next_desc =
+                                    handler_desc->address_space.region_list;
+                                last_obj_ptr =
+                                    &handler_desc->address_space.region_list;
+
+                                /* Remove the region object from the handler's list */
+
+                                while (next_desc) {
+                                        if (next_desc == object) {
+                                                *last_obj_ptr =
+                                                    next_desc->region.next;
+                                                break;
+                                        }
+
+                                        /* Walk the linked list of handler */
+
+                                        last_obj_ptr = &next_desc->region.next;
+                                        next_desc = next_desc->region.next;
+                                }
+
                                 if (handler_desc->address_space.handler_flags &
                                     ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
 
diff --git a/drivers/acpi/acpica/utmisc.c b/drivers/acpi/acpica/utmisc.c
index 1c9e250caefb..fbe782348b0b 100644
--- a/drivers/acpi/acpica/utmisc.c
+++ b/drivers/acpi/acpica/utmisc.c
@@ -1033,11 +1033,12 @@ acpi_error(const char *module_name, u32 line_number, const char *format, ...)
 {
         va_list args;
 
-        acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
+        acpi_os_printf("ACPI Error: ");
 
         va_start(args, format);
         acpi_os_vprintf(format, args);
-        acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
+        acpi_os_printf(" %8.8X %s-%u\n", ACPI_CA_VERSION, module_name,
+                       line_number);
         va_end(args);
 }
 
@@ -1047,12 +1048,12 @@ acpi_exception(const char *module_name,
 {
         va_list args;
 
-        acpi_os_printf("ACPI Exception (%s-%04d): %s, ", module_name,
-                       line_number, acpi_format_exception(status));
+        acpi_os_printf("ACPI Exception: %s, ", acpi_format_exception(status));
 
         va_start(args, format);
         acpi_os_vprintf(format, args);
-        acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
+        acpi_os_printf(" %8.8X %s-%u\n", ACPI_CA_VERSION, module_name,
+                       line_number);
         va_end(args);
 }
 
@@ -1061,11 +1062,12 @@ acpi_warning(const char *module_name, u32 line_number, const char *format, ...)
 {
         va_list args;
 
-        acpi_os_printf("ACPI Warning (%s-%04d): ", module_name, line_number);
+        acpi_os_printf("ACPI Warning: ");
 
         va_start(args, format);
         acpi_os_vprintf(format, args);
-        acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
+        acpi_os_printf(" %8.8X %s-%u\n", ACPI_CA_VERSION, module_name,
+                       line_number);
         va_end(args);
 }
 
@@ -1074,10 +1076,6 @@ acpi_info(const char *module_name, u32 line_number, const char *format, ...)
 {
         va_list args;
 
-        /*
-         * Removed module_name, line_number, and acpica version, not needed
-         * for info output
-         */
         acpi_os_printf("ACPI: ");
 
         va_start(args, format);
diff --git a/drivers/acpi/acpica/utmutex.c b/drivers/acpi/acpica/utmutex.c
index 26c93a748e64..80bb65154117 100644
--- a/drivers/acpi/acpica/utmutex.c
+++ b/drivers/acpi/acpica/utmutex.c
@@ -230,17 +230,18 @@ acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id)
                         if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) {
                                 if (i == mutex_id) {
                                         ACPI_ERROR((AE_INFO,
-                                                    "Mutex [%s] already acquired by this thread [%X]",
+                                                    "Mutex [%s] already acquired by this thread [%p]",
                                                     acpi_ut_get_mutex_name
                                                     (mutex_id),
-                                                    this_thread_id));
+                                                    ACPI_CAST_PTR(void,
+                                                                  this_thread_id)));
 
                                         return (AE_ALREADY_ACQUIRED);
                                 }
 
                                 ACPI_ERROR((AE_INFO,
-                                            "Invalid acquire order: Thread %X owns [%s], wants [%s]",
-                                            this_thread_id,
+                                            "Invalid acquire order: Thread %p owns [%s], wants [%s]",
+                                            ACPI_CAST_PTR(void, this_thread_id),
                                             acpi_ut_get_mutex_name(i),
                                             acpi_ut_get_mutex_name(mutex_id)));
 
@@ -251,24 +252,24 @@ acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id)
 #endif
 
         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
-                          "Thread %lX attempting to acquire Mutex [%s]\n",
-                          (unsigned long)this_thread_id,
+                          "Thread %p attempting to acquire Mutex [%s]\n",
+                          ACPI_CAST_PTR(void, this_thread_id),
                           acpi_ut_get_mutex_name(mutex_id)));
 
         status = acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex,
                                        ACPI_WAIT_FOREVER);
         if (ACPI_SUCCESS(status)) {
                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
-                                  "Thread %lX acquired Mutex [%s]\n",
-                                  (unsigned long)this_thread_id,
+                                  "Thread %p acquired Mutex [%s]\n",
+                                  ACPI_CAST_PTR(void, this_thread_id),
                                   acpi_ut_get_mutex_name(mutex_id)));
 
                 acpi_gbl_mutex_info[mutex_id].use_count++;
                 acpi_gbl_mutex_info[mutex_id].thread_id = this_thread_id;
         } else {
                 ACPI_EXCEPTION((AE_INFO, status,
-                                "Thread %lX could not acquire Mutex [%X]",
-                                (unsigned long)this_thread_id, mutex_id));
+                                "Thread %p could not acquire Mutex [%X]",
+                                ACPI_CAST_PTR(void, this_thread_id), mutex_id));
         }
 
         return (status);
@@ -293,9 +294,8 @@ acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
         ACPI_FUNCTION_NAME(ut_release_mutex);
 
         this_thread_id = acpi_os_get_thread_id();
-        ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
-                          "Thread %lX releasing Mutex [%s]\n",
-                          (unsigned long)this_thread_id,
+        ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %p releasing Mutex [%s]\n",
+                          ACPI_CAST_PTR(void, this_thread_id),
                           acpi_ut_get_mutex_name(mutex_id)));
 
         if (mutex_id > ACPI_MAX_MUTEX) {
diff --git a/drivers/acpi/blacklist.c b/drivers/acpi/blacklist.c
index 09c69806c1fc..f6baa77deefb 100644
--- a/drivers/acpi/blacklist.c
+++ b/drivers/acpi/blacklist.c
@@ -192,6 +192,22 @@ static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
                      DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile V5505"),
                 },
         },
+        {
+        .callback = dmi_disable_osi_vista,
+        .ident = "Sony VGN-NS10J_S",
+        .matches = {
+                     DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+                     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS10J_S"),
+                },
+        },
+        {
+        .callback = dmi_disable_osi_vista,
+        .ident = "Sony VGN-SR290J",
+        .matches = {
+                     DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+                     DMI_MATCH(DMI_PRODUCT_NAME, "Sony VGN-SR290J"),
+                },
+        },
 
         /*
          * BIOS invocation of _OSI(Linux) is almost always a BIOS bug.
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index d916bea729f1..71670719d61a 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -79,6 +79,7 @@ static acpi_osd_handler acpi_irq_handler;
 static void *acpi_irq_context;
 static struct workqueue_struct *kacpid_wq;
 static struct workqueue_struct *kacpi_notify_wq;
+static struct workqueue_struct *kacpi_hotplug_wq;
 
 struct acpi_res_list {
         resource_size_t start;
@@ -192,8 +193,10 @@ acpi_status acpi_os_initialize1(void)
 {
         kacpid_wq = create_singlethread_workqueue("kacpid");
         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
+        kacpi_hotplug_wq = create_singlethread_workqueue("kacpi_hotplug");
         BUG_ON(!kacpid_wq);
         BUG_ON(!kacpi_notify_wq);
+        BUG_ON(!kacpi_hotplug_wq);
         return AE_OK;
 }
 
@@ -206,6 +209,7 @@ acpi_status acpi_os_terminate(void)
 
         destroy_workqueue(kacpid_wq);
         destroy_workqueue(kacpi_notify_wq);
+        destroy_workqueue(kacpi_hotplug_wq);
 
         return AE_OK;
 }
@@ -716,6 +720,7 @@ static acpi_status __acpi_os_execute(acpi_execute_type type,
         acpi_status status = AE_OK;
         struct acpi_os_dpc *dpc;
         struct workqueue_struct *queue;
+        work_func_t func;
         int ret;
         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                           "Scheduling function [%p(%p)] for deferred execution.\n",
@@ -740,15 +745,17 @@ static acpi_status __acpi_os_execute(acpi_execute_type type,
         dpc->function = function;
         dpc->context = context;
 
-        if (!hp) {
-                INIT_WORK(&dpc->work, acpi_os_execute_deferred);
-                queue = (type == OSL_NOTIFY_HANDLER) ?
-                        kacpi_notify_wq : kacpid_wq;
-                ret = queue_work(queue, &dpc->work);
-        } else {
-                INIT_WORK(&dpc->work, acpi_os_execute_hp_deferred);
-                ret = schedule_work(&dpc->work);
-        }
+        /*
+         * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
+         * because the hotplug code may call driver .remove() functions,
+         * which invoke flush_scheduled_work/acpi_os_wait_events_complete
+         * to flush these workqueues.
+         */
+        queue = hp ? kacpi_hotplug_wq :
+                (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
+        func = hp ? acpi_os_execute_hp_deferred : acpi_os_execute_deferred;
+        INIT_WORK(&dpc->work, func);
+        ret = queue_work(queue, &dpc->work);
 
         if (!ret) {
                 printk(KERN_ERR PREFIX
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index ef9509e33191..b794eb88ab90 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -402,7 +402,8 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
                 /* Interrupt Line values above 0xF are forbidden */
                 if (dev->irq > 0 && (dev->irq <= 0xF)) {
                         printk(" - using IRQ %d\n", dev->irq);
-                        acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
+                        acpi_register_gsi(&dev->dev, dev->irq,
+                                          ACPI_LEVEL_SENSITIVE,
                                           ACPI_ACTIVE_LOW);
                         return 0;
                 } else {
@@ -411,7 +412,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
                 }
         }
 
-        rc = acpi_register_gsi(gsi, triggering, polarity);
+        rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
         if (rc < 0) {
                 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
                          pin_name(pin));
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index f341b0756c9e..8a5bf3b356fa 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -63,9 +63,10 @@ static struct acpi_driver acpi_pci_root_driver = {
 
 struct acpi_pci_root {
         struct list_head node;
-        struct acpi_device * device;
-        struct acpi_pci_id id;
+        struct acpi_device *device;
         struct pci_bus *bus;
+        u16 segment;
+        u8 bus_nr;
 
         u32 osc_support_set;    /* _OSC state of support bits */
         u32 osc_control_set;    /* _OSC state of control bits */
@@ -82,7 +83,7 @@ static DEFINE_MUTEX(osc_lock);
 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
 {
         int n = 0;
-        struct list_head *entry;
+        struct acpi_pci_root *root;
 
         struct acpi_pci_driver **pptr = &sub_driver;
         while (*pptr)
@@ -92,9 +93,7 @@ int acpi_pci_register_driver(struct acpi_pci_driver *driver)
         if (!driver->add)
                 return 0;
 
-        list_for_each(entry, &acpi_pci_roots) {
-                struct acpi_pci_root *root;
-                root = list_entry(entry, struct acpi_pci_root, node);
+        list_for_each_entry(root, &acpi_pci_roots, node) {
                 driver->add(root->device->handle);
                 n++;
         }
@@ -106,7 +105,7 @@ EXPORT_SYMBOL(acpi_pci_register_driver);
 
 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
 {
-        struct list_head *entry;
+        struct acpi_pci_root *root;
 
         struct acpi_pci_driver **pptr = &sub_driver;
         while (*pptr) {
@@ -120,23 +119,19 @@ void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
         if (!driver->remove)
                 return;
 
-        list_for_each(entry, &acpi_pci_roots) {
-                struct acpi_pci_root *root;
-                root = list_entry(entry, struct acpi_pci_root, node);
+        list_for_each_entry(root, &acpi_pci_roots, node)
                 driver->remove(root->device->handle);
-        }
 }
 
 EXPORT_SYMBOL(acpi_pci_unregister_driver);
 
 acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
 {
-        struct acpi_pci_root *tmp;
+        struct acpi_pci_root *root;
         
-        list_for_each_entry(tmp, &acpi_pci_roots, node) {
-                if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus))
-                        return tmp->device->handle;
-        }
+        list_for_each_entry(root, &acpi_pci_roots, node)
+                if ((root->segment == (u16) seg) && (root->bus_nr == (u16) bus))
+                        return root->device->handle;
         return NULL;            
 }
 
@@ -185,19 +180,22 @@ get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
         return AE_OK;
 }
 
-static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
+static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
+                                             unsigned long long *bus)
 {
         acpi_status status;
+        int busnum;
 
-        *busnum = -1;
+        busnum = -1;
         status =
             acpi_walk_resources(handle, METHOD_NAME__CRS,
-                                get_root_bridge_busnr_callback, busnum);
+                                get_root_bridge_busnr_callback, &busnum);
         if (ACPI_FAILURE(status))
                 return status;
         /* Check if we really get a bus number from _CRS */
-        if (*busnum == -1)
+        if (busnum == -1)
                 return AE_ERROR;
+        *bus = busnum;
         return AE_OK;
 }
 
@@ -322,6 +320,7 @@ static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
 static struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
 {
         struct acpi_pci_root *root;
+
         list_for_each_entry(root, &acpi_pci_roots, node) {
                 if (root->device->handle == handle)
                         return root;
@@ -468,25 +467,42 @@ EXPORT_SYMBOL(acpi_pci_osc_control_set);
 
 static int __devinit acpi_pci_root_add(struct acpi_device *device)
 {
-        int result = 0;
-        struct acpi_pci_root *root = NULL;
-        struct acpi_pci_root *tmp;
-        acpi_status status = AE_OK;
-        unsigned long long value = 0;
-        acpi_handle handle = NULL;
+        unsigned long long segment, bus;
+        acpi_status status;
+        int result;
+        struct acpi_pci_root *root;
+        acpi_handle handle;
         struct acpi_device *child;
         u32 flags, base_flags;
 
+        segment = 0;
+        status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
+                                       &segment);
+        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+                printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
+                return -ENODEV;
+        }
 
-        if (!device)
-                return -EINVAL;
+        /* Check _CRS first, then _BBN.  If no _BBN, default to zero. */
+        bus = 0;
+        status = try_get_root_bridge_busnr(device->handle, &bus);
+        if (ACPI_FAILURE(status)) {
+                status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,                                               NULL, &bus);
+                if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+                        printk(KERN_ERR PREFIX
+                             "no bus number in _CRS and can't evaluate _BBN\n");
+                        return -ENODEV;
+                }
+        }
 
         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
         if (!root)
                 return -ENOMEM;
-        INIT_LIST_HEAD(&root->node);
 
+        INIT_LIST_HEAD(&root->node);
         root->device = device;
+        root->segment = segment & 0xFFFF;
+        root->bus_nr = bus & 0xFF;
         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
         device->driver_data = root;
@@ -498,79 +514,6 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
         flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
         acpi_pci_osc_support(root, flags);
 
-        /* 
-         * Segment
-         * -------
-         * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
-         */
-        status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
-                                       &value);
-        switch (status) {
-        case AE_OK:
-                root->id.segment = (u16) value;
-                break;
-        case AE_NOT_FOUND:
-                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-                                  "Assuming segment 0 (no _SEG)\n"));
-                root->id.segment = 0;
-                break;
-        default:
-                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
-                result = -ENODEV;
-                goto end;
-        }
-
-        /* 
-         * Bus
-         * ---
-         * Obtained via _BBN, if exists, otherwise assumed to be zero (0).
-         */
-        status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL,
-                                       &value);
-        switch (status) {
-        case AE_OK:
-                root->id.bus = (u16) value;
-                break;
-        case AE_NOT_FOUND:
-                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
-                root->id.bus = 0;
-                break;
-        default:
-                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
-                result = -ENODEV;
-                goto end;
-        }
-
-        /* Some systems have wrong _BBN */
-        list_for_each_entry(tmp, &acpi_pci_roots, node) {
-                if ((tmp->id.segment == root->id.segment)
-                    && (tmp->id.bus == root->id.bus)) {
-                        int bus = 0;
-                        acpi_status status;
-
-                        printk(KERN_ERR PREFIX
-                                    "Wrong _BBN value, reboot"
-                                    " and use option 'pci=noacpi'\n");
-
-                        status = try_get_root_bridge_busnr(device->handle, &bus);
-                        if (ACPI_FAILURE(status))
-                                break;
-                        if (bus != root->id.bus) {
-                                printk(KERN_INFO PREFIX
-                                       "PCI _CRS %d overrides _BBN 0\n", bus);
-                                root->id.bus = bus;
-                        }
-                        break;
-                }
-        }
-        /*
-         * Device & Function
-         * -----------------
-         * Obtained from _ADR (which has already been evaluated for us).
-         */
-        root->id.device = device->pnp.bus_address >> 16;
-        root->id.function = device->pnp.bus_address & 0xFFFF;
-
         /*
          * TBD: Need PCI interface for enumeration/configuration of roots.
          */
@@ -580,7 +523,7 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
 
         printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
                acpi_device_name(device), acpi_device_bid(device),
-               root->id.segment, root->id.bus);
+               root->segment, root->bus_nr);
 
         /*
          * Scan the Root Bridge
@@ -589,11 +532,11 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
          * PCI namespace does not get created until this call is made (and 
          * thus the root bridge's pci_dev does not exist).
          */
-        root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
+        root->bus = pci_acpi_scan_root(device, segment, bus);
         if (!root->bus) {
                 printk(KERN_ERR PREFIX
                             "Bus %04x:%02x not present in PCI namespace\n",
-                            root->id.segment, root->id.bus);
+                            root->segment, root->bus_nr);
                 result = -ENODEV;
                 goto end;
         }
@@ -633,42 +576,28 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
         if (flags != base_flags)
                 acpi_pci_osc_support(root, flags);
 
-      end:
-        if (result) {
-                if (!list_empty(&root->node))
-                        list_del(&root->node);
-                kfree(root);
-        }
+        return 0;
 
+end:
+        if (!list_empty(&root->node))
+                list_del(&root->node);
+        kfree(root);
         return result;
 }
 
 static int acpi_pci_root_start(struct acpi_device *device)
 {
-        struct acpi_pci_root *root;
+        struct acpi_pci_root *root = acpi_driver_data(device);
 
-
-        list_for_each_entry(root, &acpi_pci_roots, node) {
-                if (root->device == device) {
-                        pci_bus_add_devices(root->bus);
-                        return 0;
-                }
-        }
-        return -ENODEV;
+        pci_bus_add_devices(root->bus);
+        return 0;
 }
 
 static int acpi_pci_root_remove(struct acpi_device *device, int type)
 {
-        struct acpi_pci_root *root = NULL;
-
-
-        if (!device || !acpi_driver_data(device))
-                return -EINVAL;
-
-        root = acpi_driver_data(device);
+        struct acpi_pci_root *root = acpi_driver_data(device);
 
         kfree(root);
-
         return 0;
 }
 
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 56665a63bf19..d74365d4a6e7 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -194,7 +194,7 @@ static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
 
 static int acpi_power_on(acpi_handle handle, struct acpi_device *dev)
 {
-        int result = 0, state;
+        int result = 0;
         int found = 0;
         acpi_status status = AE_OK;
         struct acpi_power_resource *resource = NULL;
@@ -236,18 +236,6 @@ static int acpi_power_on(acpi_handle handle, struct acpi_device *dev)
         if (ACPI_FAILURE(status))
                 return -ENODEV;
 
-        if (!acpi_power_nocheck) {
-                /*
-                 * If acpi_power_nocheck is set, it is unnecessary to check
-                 * the power state after power transition.
-                 */
-                result = acpi_power_get_state(resource->device->handle,
-                                &state);
-                if (result)
-                        return result;
-                if (state != ACPI_POWER_RESOURCE_STATE_ON)
-                        return -ENOEXEC;
-        }
         /* Update the power resource's _device_ power state */
         resource->device->power.state = ACPI_STATE_D0;
 
@@ -258,7 +246,7 @@ static int acpi_power_on(acpi_handle handle, struct acpi_device *dev)
 
 static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev)
 {
-        int result = 0, state;
+        int result = 0;
         acpi_status status = AE_OK;
         struct acpi_power_resource *resource = NULL;
         struct list_head *node, *next;
@@ -293,18 +281,6 @@ static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev)
         if (ACPI_FAILURE(status))
                 return -ENODEV;
 
-        if (!acpi_power_nocheck) {
-                /*
-                 * If acpi_power_nocheck is set, it is unnecessary to check
-                 * the power state after power transition.
-                 */
-                result = acpi_power_get_state(handle, &state);
-                if (result)
-                        return result;
-                if (state != ACPI_POWER_RESOURCE_STATE_OFF)
-                        return -ENOEXEC;
-        }
-
         /* Update the power resource's _device_ power state */
         resource->device->power.state = ACPI_STATE_D3;
 
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 23f0fb84f1c1..84e0f3c07442 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -89,7 +89,7 @@ static int acpi_processor_handle_eject(struct acpi_processor *pr);
 
 static const struct acpi_device_id processor_device_ids[] = {
         {ACPI_PROCESSOR_OBJECT_HID, 0},
-        {ACPI_PROCESSOR_HID, 0},
+        {"ACPI0007", 0},
         {"", 0},
 };
 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
@@ -596,7 +596,21 @@ static int acpi_processor_get_info(struct acpi_device *device)
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                   "No bus mastering arbitration control\n"));
 
-        if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) {
+        if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
+                /* Declared with "Processor" statement; match ProcessorID */
+                status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
+                if (ACPI_FAILURE(status)) {
+                        printk(KERN_ERR PREFIX "Evaluating processor object\n");
+                        return -ENODEV;
+                }
+
+                /*
+                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
+                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
+                 *      arch/xxx/acpi.c
+                 */
+                pr->acpi_id = object.processor.proc_id;
+        } else {
                 /*
                  * Declared with "Device" statement; match _UID.
                  * Note that we don't handle string _UIDs yet.
@@ -611,20 +625,6 @@ static int acpi_processor_get_info(struct acpi_device *device)
                 }
                 device_declaration = 1;
                 pr->acpi_id = value;
-        } else {
-                /* Declared with "Processor" statement; match ProcessorID */
-                status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
-                if (ACPI_FAILURE(status)) {
-                        printk(KERN_ERR PREFIX "Evaluating processor object\n");
-                        return -ENODEV;
-                }
-
-                /*
-                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
-                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
-                 *      arch/xxx/acpi.c
-                 */
-                pr->acpi_id = object.processor.proc_id;
         }
         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
 
@@ -649,7 +649,16 @@ static int acpi_processor_get_info(struct acpi_device *device)
                         return -ENODEV;
                 }
         }
-
+        /*
+         * On some boxes several processors use the same processor bus id.
+         * But they are located in different scope. For example:
+         * \_SB.SCK0.CPU0
+         * \_SB.SCK1.CPU0
+         * Rename the processor device bus id. And the new bus id will be
+         * generated as the following format:
+         * CPU+CPU ID.
+         */
+        sprintf(acpi_device_bid(device), "CPU%X", pr->id);
         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
                           pr->acpi_id));
 
@@ -731,6 +740,8 @@ static int __cpuinit acpi_processor_start(struct acpi_device *device)
         /* _PDC call should be done before doing anything else (if reqd.). */
         arch_acpi_processor_init_pdc(pr);
         acpi_processor_set_pdc(pr);
+        arch_acpi_processor_cleanup_pdc(pr);
+
 #ifdef CONFIG_CPU_FREQ
         acpi_processor_ppc_has_changed(pr);
 #endif
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 10a2d913635a..0efa59e7e3af 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -139,7 +139,7 @@ static void acpi_safe_halt(void)
  * are affected too. We pick the most conservative approach: we assume
  * that the local APIC stops in both C2 and C3.
  */
-static void acpi_timer_check_state(int state, struct acpi_processor *pr,
+static void lapic_timer_check_state(int state, struct acpi_processor *pr,
                                    struct acpi_processor_cx *cx)
 {
         struct acpi_processor_power *pwr = &pr->power;
@@ -162,7 +162,7 @@ static void acpi_timer_check_state(int state, struct acpi_processor *pr,
                 pr->power.timer_broadcast_on_state = state;
 }
 
-static void acpi_propagate_timer_broadcast(struct acpi_processor *pr)
+static void lapic_timer_propagate_broadcast(struct acpi_processor *pr)
 {
         unsigned long reason;
 
@@ -173,7 +173,7 @@ static void acpi_propagate_timer_broadcast(struct acpi_processor *pr)
 }
 
 /* Power(C) State timer broadcast control */
-static void acpi_state_timer_broadcast(struct acpi_processor *pr,
+static void lapic_timer_state_broadcast(struct acpi_processor *pr,
                                        struct acpi_processor_cx *cx,
                                        int broadcast)
 {
@@ -190,10 +190,10 @@ static void acpi_state_timer_broadcast(struct acpi_processor *pr,
 
 #else
 
-static void acpi_timer_check_state(int state, struct acpi_processor *pr,
+static void lapic_timer_check_state(int state, struct acpi_processor *pr,
                                    struct acpi_processor_cx *cstate) { }
-static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) { }
-static void acpi_state_timer_broadcast(struct acpi_processor *pr,
+static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { }
+static void lapic_timer_state_broadcast(struct acpi_processor *pr,
                                        struct acpi_processor_cx *cx,
                                        int broadcast)
 {
@@ -515,7 +515,8 @@ static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
 static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
                                            struct acpi_processor_cx *cx)
 {
-        static int bm_check_flag;
+        static int bm_check_flag = -1;
+        static int bm_control_flag = -1;
 
 
         if (!cx->address)
@@ -545,12 +546,14 @@ static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
         }
 
         /* All the logic here assumes flags.bm_check is same across all CPUs */
-        if (!bm_check_flag) {
+        if (bm_check_flag == -1) {
                 /* Determine whether bm_check is needed based on CPU  */
                 acpi_processor_power_init_bm_check(&(pr->flags), pr->id);
                 bm_check_flag = pr->flags.bm_check;
+                bm_control_flag = pr->flags.bm_control;
         } else {
                 pr->flags.bm_check = bm_check_flag;
+                pr->flags.bm_control = bm_control_flag;
         }
 
         if (pr->flags.bm_check) {
@@ -614,29 +617,25 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
                 switch (cx->type) {
                 case ACPI_STATE_C1:
                         cx->valid = 1;
-                        acpi_timer_check_state(i, pr, cx);
                         break;
 
                 case ACPI_STATE_C2:
                         acpi_processor_power_verify_c2(cx);
-                        if (cx->valid)
-                                acpi_timer_check_state(i, pr, cx);
                         break;
 
                 case ACPI_STATE_C3:
                         acpi_processor_power_verify_c3(pr, cx);
-                        if (cx->valid)
-                                acpi_timer_check_state(i, pr, cx);
                         break;
                 }
-                if (cx->valid)
-                        tsc_check_state(cx->type);
+                if (!cx->valid)
+                        continue;
 
-                if (cx->valid)
-                        working++;
+                lapic_timer_check_state(i, pr, cx);
+                tsc_check_state(cx->type);
+                working++;
         }
 
-        acpi_propagate_timer_broadcast(pr);
+        lapic_timer_propagate_broadcast(pr);
 
         return (working);
 }
@@ -839,7 +838,7 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev,
                 return 0;
         }
 
-        acpi_state_timer_broadcast(pr, cx, 1);
+        lapic_timer_state_broadcast(pr, cx, 1);
         kt1 = ktime_get_real();
         acpi_idle_do_entry(cx);
         kt2 = ktime_get_real();
@@ -847,7 +846,7 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev,
 
         local_irq_enable();
         cx->usage++;
-        acpi_state_timer_broadcast(pr, cx, 0);
+        lapic_timer_state_broadcast(pr, cx, 0);
 
         return idle_time;
 }
@@ -892,7 +891,7 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
          * Must be done before busmaster disable as we might need to
          * access HPET !
          */
-        acpi_state_timer_broadcast(pr, cx, 1);
+        lapic_timer_state_broadcast(pr, cx, 1);
 
         if (cx->type == ACPI_STATE_C3)
                 ACPI_FLUSH_CPU_CACHE();
@@ -914,7 +913,7 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
 
         cx->usage++;
 
-        acpi_state_timer_broadcast(pr, cx, 0);
+        lapic_timer_state_broadcast(pr, cx, 0);
         cx->time += sleep_ticks;
         return idle_time;
 }
@@ -981,7 +980,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
          * Must be done before busmaster disable as we might need to
          * access HPET !
          */
-        acpi_state_timer_broadcast(pr, cx, 1);
+        lapic_timer_state_broadcast(pr, cx, 1);
 
         kt1 = ktime_get_real();
         /*
@@ -1026,7 +1025,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
 
         cx->usage++;
 
-        acpi_state_timer_broadcast(pr, cx, 0);
+        lapic_timer_state_broadcast(pr, cx, 0);
         cx->time += sleep_ticks;
         return idle_time;
 }
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 8ff510b91d88..781435d7e369 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -95,7 +95,7 @@ acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, cha
 }
 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 
-static int acpi_bus_hot_remove_device(void *context)
+static void acpi_bus_hot_remove_device(void *context)
 {
         struct acpi_device *device;
         acpi_handle handle = context;
@@ -104,10 +104,10 @@ static int acpi_bus_hot_remove_device(void *context)
         acpi_status status = AE_OK;
 
         if (acpi_bus_get_device(handle, &device))
-                return 0;
+                return;
 
         if (!device)
-                return 0;
+                return;
 
         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                 "Hot-removing device %s...\n", dev_name(&device->dev)));
@@ -115,7 +115,7 @@ static int acpi_bus_hot_remove_device(void *context)
         if (acpi_bus_trim(device, 1)) {
                 printk(KERN_ERR PREFIX
                                 "Removing device failed\n");
-                return -1;
+                return;
         }
 
         /* power off device */
@@ -142,9 +142,10 @@ static int acpi_bus_hot_remove_device(void *context)
          */
         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
         if (ACPI_FAILURE(status))
-                return -ENODEV;
+                printk(KERN_WARNING PREFIX
+                                "Eject device failed\n");
 
-        return 0;
+        return;
 }
 
 static ssize_t
@@ -155,7 +156,6 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
         acpi_status status;
         acpi_object_type type = 0;
         struct acpi_device *acpi_device = to_acpi_device(d);
-        struct task_struct *task;
 
         if ((!count) || (buf[0] != '1')) {
                 return -EINVAL;
@@ -172,11 +172,7 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
                 goto err;
         }
 
-        /* remove the device in another thread to fix the deadlock issue */
-        task = kthread_run(acpi_bus_hot_remove_device,
-                                acpi_device->handle, "acpi_hot_remove_device");
-        if (IS_ERR(task))
-                ret = PTR_ERR(task);
+        acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
 err:
         return ret;
 }
@@ -198,12 +194,12 @@ acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *b
         int result;
 
         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
-        if(result)
+        if (result)
                 goto end;
 
         result = sprintf(buf, "%s\n", (char*)path.pointer);
         kfree(path.pointer);
-  end:
+end:
         return result;
 }
 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
@@ -217,21 +213,21 @@ static int acpi_device_setup_files(struct acpi_device *dev)
         /*
          * Devices gotten from FADT don't have a "path" attribute
          */
-        if(dev->handle) {
+        if (dev->handle) {
                 result = device_create_file(&dev->dev, &dev_attr_path);
-                if(result)
+                if (result)
                         goto end;
         }
 
-        if(dev->flags.hardware_id) {
+        if (dev->flags.hardware_id) {
                 result = device_create_file(&dev->dev, &dev_attr_hid);
-                if(result)
+                if (result)
                         goto end;
         }
 
-        if (dev->flags.hardware_id || dev->flags.compatible_ids){
+        if (dev->flags.hardware_id || dev->flags.compatible_ids) {
                 result = device_create_file(&dev->dev, &dev_attr_modalias);
-                if(result)
+                if (result)
                         goto end;
         }
 
@@ -242,7 +238,7 @@ static int acpi_device_setup_files(struct acpi_device *dev)
         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
         if (ACPI_SUCCESS(status))
                 result = device_create_file(&dev->dev, &dev_attr_eject);
-  end:
+end:
         return result;
 }
 
@@ -262,9 +258,9 @@ static void acpi_device_remove_files(struct acpi_device *dev)
         if (dev->flags.hardware_id || dev->flags.compatible_ids)
                 device_remove_file(&dev->dev, &dev_attr_modalias);
 
-        if(dev->flags.hardware_id)
+        if (dev->flags.hardware_id)
                 device_remove_file(&dev->dev, &dev_attr_hid);
-        if(dev->handle)
+        if (dev->handle)
                 device_remove_file(&dev->dev, &dev_attr_path);
 }
 /* --------------------------------------------------------------------------
@@ -512,7 +508,7 @@ static int acpi_device_register(struct acpi_device *device,
                         break;
                 }
         }
-        if(!found) {
+        if (!found) {
                 acpi_device_bus_id = new_bus_id;
                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
                 acpi_device_bus_id->instance_no = 0;
@@ -530,22 +526,21 @@ static int acpi_device_register(struct acpi_device *device,
         if (device->parent)
                 device->dev.parent = &parent->dev;
         device->dev.bus = &acpi_bus_type;
-        device_initialize(&device->dev);
         device->dev.release = &acpi_device_release;
-        result = device_add(&device->dev);
-        if(result) {
-                dev_err(&device->dev, "Error adding device\n");
+        result = device_register(&device->dev);
+        if (result) {
+                dev_err(&device->dev, "Error registering device\n");
                 goto end;
         }
 
         result = acpi_device_setup_files(device);
-        if(result)
+        if (result)
                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
                        dev_name(&device->dev));
 
         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
         return 0;
-  end:
+end:
         mutex_lock(&acpi_device_lock);
         if (device->parent)
                 list_del(&device->node);
@@ -577,7 +572,7 @@ static void acpi_device_unregister(struct acpi_device *device, int type)
  * @device: the device to add and initialize
  * @driver: driver for the device
  *
- * Used to initialize a device via its device driver.  Called whenever a 
+ * Used to initialize a device via its device driver.  Called whenever a
  * driver is bound to a device.  Invokes the driver's add() ops.
  */
 static int
@@ -585,7 +580,6 @@ acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 {
         int result = 0;
 
-
         if (!device || !driver)
                 return -EINVAL;
 
@@ -802,7 +796,7 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
         if (!acpi_match_device_ids(device, button_device_ids))
                 device->wakeup.flags.run_wake = 1;
 
-      end:
+end:
         if (ACPI_FAILURE(status))
                 device->flags.wake_capable = 0;
         return 0;
@@ -1070,7 +1064,7 @@ static void acpi_device_set_id(struct acpi_device *device,
                 break;
         }
 
-        /* 
+        /*
          * \_SB
          * ----
          * Fix for the system root bus device -- the only root-level device.
@@ -1320,7 +1314,7 @@ acpi_add_single_object(struct acpi_device **child,
                         device->parent->ops.bind(device);
         }
 
-      end:
+end:
         if (!result)
                 *child = device;
         else {
@@ -1464,7 +1458,6 @@ acpi_bus_add(struct acpi_device **child,
 
         return result;
 }
-
 EXPORT_SYMBOL(acpi_bus_add);
 
 int acpi_bus_start(struct acpi_device *device)
@@ -1484,7 +1477,6 @@ int acpi_bus_start(struct acpi_device *device)
         }
         return result;
 }
-
 EXPORT_SYMBOL(acpi_bus_start);
 
 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
@@ -1542,7 +1534,6 @@ int acpi_bus_trim(struct acpi_device *start, int rmdevice)
 }
 EXPORT_SYMBOL_GPL(acpi_bus_trim);
 
-
 static int acpi_bus_scan_fixed(struct acpi_device *root)
 {
         int result = 0;
@@ -1610,6 +1601,6 @@ int __init acpi_scan_init(void)
         if (result)
                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
 
-      Done:
+Done:
         return result;
 }
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 5adbf9361e60..8851315ce858 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -76,6 +76,7 @@ MODULE_LICENSE("GPL");
 static int brightness_switch_enabled = 1;
 module_param(brightness_switch_enabled, bool, 0644);
 
+static int register_count = 0;
 static int acpi_video_bus_add(struct acpi_device *device);
 static int acpi_video_bus_remove(struct acpi_device *device, int type);
 static int acpi_video_resume(struct acpi_device *device);
@@ -586,6 +587,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
                 },
         },
+        {
+         .callback = video_set_bqc_offset,
+         .ident = "Acer Aspire 7720",
+         .matches = {
+                DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
+                DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
+                },
+        },
         {}
 };
 
@@ -976,6 +985,11 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
                 device->backlight->props.max_brightness = device->brightness->count-3;
                 kfree(name);
 
+                result = sysfs_create_link(&device->backlight->dev.kobj,
+                                           &device->dev->dev.kobj, "device");
+                if (result)
+                        printk(KERN_ERR PREFIX "Create sysfs link\n");
+
                 device->cdev = thermal_cooling_device_register("LCD",
                                         device->dev, &video_cooling_ops);
                 if (IS_ERR(device->cdev))
@@ -1990,6 +2004,7 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
         status = acpi_remove_notify_handler(device->dev->handle,
                                             ACPI_DEVICE_NOTIFY,
                                             acpi_video_device_notify);
+        sysfs_remove_link(&device->backlight->dev.kobj, "device");
         backlight_device_unregister(device->backlight);
         if (device->cdev) {
                 sysfs_remove_link(&device->dev->dev.kobj,
@@ -2318,6 +2333,13 @@ static int __init intel_opregion_present(void)
 int acpi_video_register(void)
 {
         int result = 0;
+        if (register_count) {
+                /*
+                 * if the function of acpi_video_register is already called,
+                 * don't register the acpi_vide_bus again and return no error.
+                 */
+                return 0;
+        }
 
         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
         if (!acpi_video_dir)
@@ -2329,10 +2351,35 @@ int acpi_video_register(void)
                 return -ENODEV;
         }
 
+        /*
+         * When the acpi_video_bus is loaded successfully, increase
+         * the counter reference.
+         */
+        register_count = 1;
+
         return 0;
 }
 EXPORT_SYMBOL(acpi_video_register);
 
+void acpi_video_unregister(void)
+{
+        if (!register_count) {
+                /*
+                 * If the acpi video bus is already unloaded, don't
+                 * unload it again and return directly.
+                 */
+                return;
+        }
+        acpi_bus_unregister_driver(&acpi_video_bus);
+
+        remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
+
+        register_count = 0;
+
+        return;
+}
+EXPORT_SYMBOL(acpi_video_unregister);
+
 /*
  * This is kind of nasty. Hardware using Intel chipsets may require
  * the video opregion code to be run first in order to initialise
@@ -2350,16 +2397,12 @@ static int __init acpi_video_init(void)
         return acpi_video_register();
 }
 
-void acpi_video_exit(void)
+static void __exit acpi_video_exit(void)
 {
-
-        acpi_bus_unregister_driver(&acpi_video_bus);
-
-        remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
+        acpi_video_unregister();
 
         return;
 }
-EXPORT_SYMBOL(acpi_video_exit);
 
 module_init(acpi_video_init);
 module_exit(acpi_video_exit);