9 files changed, 125 insertions, 82 deletions

diff --git a/drivers/acpi/executer/exconvrt.c b/drivers/acpi/executer/exconvrt.c
index d470e8b1f4ea..79f2c0d42c06 100644
--- a/drivers/acpi/executer/exconvrt.c
+++ b/drivers/acpi/executer/exconvrt.c
@@ -512,9 +512,8 @@ acpi_ex_convert_to_string(union acpi_operand_object * obj_desc,
                  * Create a new string object and string buffer
                  * (-1 because of extra separator included in string_length from above)
                  */
-                return_desc =
-                    acpi_ut_create_string_object((acpi_size)
-                                                 (string_length - 1));
+                return_desc = acpi_ut_create_string_object((acpi_size)
+                                                           (string_length - 1));
                 if (!return_desc) {
                         return_ACPI_STATUS(AE_NO_MEMORY);
                 }
diff --git a/drivers/acpi/executer/excreate.c b/drivers/acpi/executer/excreate.c
index ae97812681a3..6e9a23e47fef 100644
--- a/drivers/acpi/executer/excreate.c
+++ b/drivers/acpi/executer/excreate.c
@@ -50,7 +50,6 @@
 
 #define _COMPONENT          ACPI_EXECUTER
 ACPI_MODULE_NAME("excreate")
-
 #ifndef ACPI_NO_METHOD_EXECUTION
 /*******************************************************************************
  *
@@ -583,10 +582,7 @@ acpi_ex_create_method(u8 * aml_start,
          * Get the sync_level. If method is serialized, a mutex will be
          * created for this method when it is parsed.
          */
-        if (acpi_gbl_all_methods_serialized) {
-                obj_desc->method.sync_level = 0;
-                obj_desc->method.method_flags |= AML_METHOD_SERIALIZED;
-        } else if (method_flags & AML_METHOD_SERIALIZED) {
+        if (method_flags & AML_METHOD_SERIALIZED) {
                 /*
                  * ACPI 1.0: sync_level = 0
                  * ACPI 2.0: sync_level = sync_level in method declaration
diff --git a/drivers/acpi/executer/exdump.c b/drivers/acpi/executer/exdump.c
index 1a73c14df2c5..51c9c29987c3 100644
--- a/drivers/acpi/executer/exdump.c
+++ b/drivers/acpi/executer/exdump.c
@@ -134,7 +134,7 @@ static struct acpi_exdump_info acpi_ex_dump_method[8] = {
 static struct acpi_exdump_info acpi_ex_dump_mutex[5] = {
         {ACPI_EXD_INIT, ACPI_EXD_TABLE_SIZE(acpi_ex_dump_mutex), NULL},
         {ACPI_EXD_UINT8, ACPI_EXD_OFFSET(mutex.sync_level), "Sync Level"},
-        {ACPI_EXD_POINTER, ACPI_EXD_OFFSET(mutex.owner_thread_id), "Owner Thread"},
+        {ACPI_EXD_POINTER, ACPI_EXD_OFFSET(mutex.owner_thread), "Owner Thread"},
         {ACPI_EXD_UINT16, ACPI_EXD_OFFSET(mutex.acquisition_depth),
          "Acquire Depth"},
         {ACPI_EXD_POINTER, ACPI_EXD_OFFSET(mutex.os_mutex), "OsMutex"}
@@ -451,9 +451,8 @@ void acpi_ex_dump_operand(union acpi_operand_object *obj_desc, u32 depth)
 
         ACPI_FUNCTION_NAME(ex_dump_operand)
 
-            if (!
-                ((ACPI_LV_EXEC & acpi_dbg_level)
-                 && (_COMPONENT & acpi_dbg_layer))) {
+            if (!((ACPI_LV_EXEC & acpi_dbg_level)
+                  && (_COMPONENT & acpi_dbg_layer))) {
                 return;
         }
 
@@ -844,9 +843,8 @@ void acpi_ex_dump_namespace_node(struct acpi_namespace_node *node, u32 flags)
         ACPI_FUNCTION_ENTRY();
 
         if (!flags) {
-                if (!
-                    ((ACPI_LV_OBJECTS & acpi_dbg_level)
-                     && (_COMPONENT & acpi_dbg_layer))) {
+                if (!((ACPI_LV_OBJECTS & acpi_dbg_level)
+                      && (_COMPONENT & acpi_dbg_layer))) {
                         return;
                 }
         }
@@ -1011,9 +1009,8 @@ acpi_ex_dump_object_descriptor(union acpi_operand_object *obj_desc, u32 flags)
         }
 
         if (!flags) {
-                if (!
-                    ((ACPI_LV_OBJECTS & acpi_dbg_level)
-                     && (_COMPONENT & acpi_dbg_layer))) {
+                if (!((ACPI_LV_OBJECTS & acpi_dbg_level)
+                      && (_COMPONENT & acpi_dbg_layer))) {
                         return_VOID;
                 }
         }
diff --git a/drivers/acpi/executer/exmutex.c b/drivers/acpi/executer/exmutex.c
index 4eb883bda6ae..6748e3ef0997 100644
--- a/drivers/acpi/executer/exmutex.c
+++ b/drivers/acpi/executer/exmutex.c
@@ -66,9 +66,10 @@ acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
  *
  ******************************************************************************/
 
-void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc,
-                          struct acpi_thread_state *thread)
+void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc)
 {
+        struct acpi_thread_state *thread = obj_desc->mutex.owner_thread;
+
         if (!thread) {
                 return;
         }
@@ -173,13 +174,16 @@ acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
 
         /* Support for multiple acquires by the owning thread */
 
-        if (obj_desc->mutex.owner_thread_id == acpi_os_get_thread_id()) {
-                /*
-                 * The mutex is already owned by this thread, just increment the
-                 * acquisition depth
-                 */
-                obj_desc->mutex.acquisition_depth++;
-                return_ACPI_STATUS(AE_OK);
+        if (obj_desc->mutex.owner_thread) {
+                if (obj_desc->mutex.owner_thread->thread_id ==
+                    walk_state->thread->thread_id) {
+                        /*
+                         * The mutex is already owned by this thread, just increment the
+                         * acquisition depth
+                         */
+                        obj_desc->mutex.acquisition_depth++;
+                        return_ACPI_STATUS(AE_OK);
+                }
         }
 
         /* Acquire the mutex, wait if necessary. Special case for Global Lock */
@@ -202,7 +206,7 @@ acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
 
         /* Have the mutex: update mutex and walk info and save the sync_level */
 
-        obj_desc->mutex.owner_thread_id = acpi_os_get_thread_id();
+        obj_desc->mutex.owner_thread = walk_state->thread;
         obj_desc->mutex.acquisition_depth = 1;
         obj_desc->mutex.original_sync_level =
             walk_state->thread->current_sync_level;
@@ -242,7 +246,7 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
 
         /* The mutex must have been previously acquired in order to release it */
 
-        if (!obj_desc->mutex.owner_thread_id) {
+        if (!obj_desc->mutex.owner_thread) {
                 ACPI_ERROR((AE_INFO,
                             "Cannot release Mutex [%4.4s], not acquired",
                             acpi_ut_get_node_name(obj_desc->mutex.node)));
@@ -262,14 +266,15 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
          * The Mutex is owned, but this thread must be the owner.
          * Special case for Global Lock, any thread can release
          */
-        if ((obj_desc->mutex.owner_thread_id !=
+        if ((obj_desc->mutex.owner_thread->thread_id !=
              walk_state->thread->thread_id)
             && (obj_desc->mutex.os_mutex != 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,
                             acpi_ut_get_node_name(obj_desc->mutex.node),
-                            (unsigned long)obj_desc->mutex.owner_thread_id));
+                            (unsigned long)obj_desc->mutex.owner_thread->
+                            thread_id));
                 return_ACPI_STATUS(AE_AML_NOT_OWNER);
         }
 
@@ -296,7 +301,7 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
 
         /* Unlink the mutex from the owner's list */
 
-        acpi_ex_unlink_mutex(obj_desc, walk_state->thread);
+        acpi_ex_unlink_mutex(obj_desc);
 
         /* Release the mutex, special case for Global Lock */
 
@@ -308,7 +313,7 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
 
         /* Update the mutex and restore sync_level */
 
-        obj_desc->mutex.owner_thread_id = ACPI_MUTEX_NOT_ACQUIRED;
+        obj_desc->mutex.owner_thread = NULL;
         walk_state->thread->current_sync_level =
             obj_desc->mutex.original_sync_level;
 
@@ -363,7 +368,7 @@ void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread)
 
                 /* Mark mutex unowned */
 
-                obj_desc->mutex.owner_thread_id = ACPI_MUTEX_NOT_ACQUIRED;
+                obj_desc->mutex.owner_thread = NULL;
 
                 /* Update Thread sync_level (Last mutex is the important one) */
 
diff --git a/drivers/acpi/executer/exnames.c b/drivers/acpi/executer/exnames.c
index 1ee4fb1175c6..308eae52dc05 100644
--- a/drivers/acpi/executer/exnames.c
+++ b/drivers/acpi/executer/exnames.c
@@ -177,8 +177,7 @@ static acpi_status acpi_ex_name_segment(u8 ** in_aml_address, char *name_string)
 
         ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Bytes from stream:\n"));
 
-        for (index = 0;
-             (index < ACPI_NAME_SIZE)
+        for (index = 0; (index < ACPI_NAME_SIZE)
              && (acpi_ut_valid_acpi_char(*aml_address, 0)); index++) {
                 char_buf[index] = *aml_address++;
                 ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "%c\n", char_buf[index]));
diff --git a/drivers/acpi/executer/exprep.c b/drivers/acpi/executer/exprep.c
index a6696621ff1b..efe5d4b461a4 100644
--- a/drivers/acpi/executer/exprep.c
+++ b/drivers/acpi/executer/exprep.c
@@ -242,7 +242,7 @@ acpi_ex_decode_field_access(union acpi_operand_object *obj_desc,
                                             obj_desc->common_field.bit_length,
                                             0xFFFFFFFF
                                             /* Temp until we pass region_length as parameter */
-                                            );
+                    );
                 bit_length = byte_alignment * 8;
 #endif
 
diff --git a/drivers/acpi/executer/exresop.c b/drivers/acpi/executer/exresop.c
index ba761862a599..09d897b3f6d5 100644
--- a/drivers/acpi/executer/exresop.c
+++ b/drivers/acpi/executer/exresop.c
@@ -354,8 +354,7 @@ acpi_ex_resolve_operands(u16 opcode,
                         if ((opcode == AML_STORE_OP) &&
                             (ACPI_GET_OBJECT_TYPE(*stack_ptr) ==
                              ACPI_TYPE_LOCAL_REFERENCE)
-                            && ((*stack_ptr)->reference.opcode ==
-                                AML_INDEX_OP)) {
+                            && ((*stack_ptr)->reference.opcode == AML_INDEX_OP)) {
                                 goto next_operand;
                         }
                         break;
diff --git a/drivers/acpi/executer/exsystem.c b/drivers/acpi/executer/exsystem.c
index b2edf620ba89..9460baff3032 100644
--- a/drivers/acpi/executer/exsystem.c
+++ b/drivers/acpi/executer/exsystem.c
@@ -66,7 +66,6 @@ ACPI_MODULE_NAME("exsystem")
 acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
 {
         acpi_status status;
-        acpi_status status2;
 
         ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
 
@@ -79,7 +78,7 @@ acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
 
                 /* We must wait, so unlock the interpreter */
 
-                acpi_ex_exit_interpreter();
+                acpi_ex_relinquish_interpreter();
 
                 status = acpi_os_wait_semaphore(semaphore, 1, timeout);
 
@@ -89,13 +88,7 @@ acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
 
                 /* Reacquire the interpreter */
 
-                status2 = acpi_ex_enter_interpreter();
-                if (ACPI_FAILURE(status2)) {
-
-                        /* Report fatal error, could not acquire interpreter */
-
-                        return_ACPI_STATUS(status2);
-                }
+                acpi_ex_reacquire_interpreter();
         }
 
         return_ACPI_STATUS(status);
@@ -119,7 +112,6 @@ acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
 acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
 {
         acpi_status status;
-        acpi_status status2;
 
         ACPI_FUNCTION_TRACE(ex_system_wait_mutex);
 
@@ -132,7 +124,7 @@ acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
 
                 /* We must wait, so unlock the interpreter */
 
-                acpi_ex_exit_interpreter();
+                acpi_ex_relinquish_interpreter();
 
                 status = acpi_os_acquire_mutex(mutex, timeout);
 
@@ -142,13 +134,7 @@ acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
 
                 /* Reacquire the interpreter */
 
-                status2 = acpi_ex_enter_interpreter();
-                if (ACPI_FAILURE(status2)) {
-
-                        /* Report fatal error, could not acquire interpreter */
-
-                        return_ACPI_STATUS(status2);
-                }
+                acpi_ex_reacquire_interpreter();
         }
 
         return_ACPI_STATUS(status);
@@ -209,20 +195,18 @@ acpi_status acpi_ex_system_do_stall(u32 how_long)
 
 acpi_status acpi_ex_system_do_suspend(acpi_integer how_long)
 {
-        acpi_status status;
-
         ACPI_FUNCTION_ENTRY();
 
         /* Since this thread will sleep, we must release the interpreter */
 
-        acpi_ex_exit_interpreter();
+        acpi_ex_relinquish_interpreter();
 
         acpi_os_sleep(how_long);
 
         /* And now we must get the interpreter again */
 
-        status = acpi_ex_enter_interpreter();
-        return (status);
+        acpi_ex_reacquire_interpreter();
+        return (AE_OK);
 }
 
 /*******************************************************************************
diff --git a/drivers/acpi/executer/exutils.c b/drivers/acpi/executer/exutils.c
index aea461f3a48c..6b0aeccbb69b 100644
--- a/drivers/acpi/executer/exutils.c
+++ b/drivers/acpi/executer/exutils.c
@@ -76,14 +76,15 @@ static u32 acpi_ex_digits_needed(acpi_integer value, u32 base);
  *
  * PARAMETERS:  None
  *
- * RETURN:      Status
+ * RETURN:      None
  *
- * DESCRIPTION: Enter the interpreter execution region.  Failure to enter
- *              the interpreter region is a fatal system error
+ * DESCRIPTION: Enter the interpreter execution region. Failure to enter
+ *              the interpreter region is a fatal system error. Used in
+ *              conjunction with exit_interpreter.
  *
  ******************************************************************************/
 
-acpi_status acpi_ex_enter_interpreter(void)
+void acpi_ex_enter_interpreter(void)
 {
         acpi_status status;
 
@@ -91,31 +92,55 @@ acpi_status acpi_ex_enter_interpreter(void)
 
         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
         if (ACPI_FAILURE(status)) {
-                ACPI_ERROR((AE_INFO, "Could not acquire interpreter mutex"));
+                ACPI_ERROR((AE_INFO,
+                            "Could not acquire AML Interpreter mutex"));
         }
 
-        return_ACPI_STATUS(status);
+        return_VOID;
 }
 
 /*******************************************************************************
  *
- * FUNCTION:    acpi_ex_exit_interpreter
+ * FUNCTION:    acpi_ex_reacquire_interpreter
  *
  * PARAMETERS:  None
  *
  * RETURN:      None
  *
- * DESCRIPTION: Exit the interpreter execution region
+ * DESCRIPTION: Reacquire the interpreter execution region from within the
+ *              interpreter code. Failure to enter the interpreter region is a
+ *              fatal system error. Used in  conjuction with
+ *              relinquish_interpreter
+ *
+ ******************************************************************************/
+
+void acpi_ex_reacquire_interpreter(void)
+{
+        ACPI_FUNCTION_TRACE(ex_reacquire_interpreter);
+
+        /*
+         * If the global serialized flag is set, do not release the interpreter,
+         * since it was not actually released by acpi_ex_relinquish_interpreter.
+         * This forces the interpreter to be single threaded.
+         */
+        if (!acpi_gbl_all_methods_serialized) {
+                acpi_ex_enter_interpreter();
+        }
+
+        return_VOID;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_exit_interpreter
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      None
  *
- * Cases where the interpreter is unlocked:
- *      1) Completion of the execution of a control method
- *      2) Method blocked on a Sleep() AML opcode
- *      3) Method blocked on an Acquire() AML opcode
- *      4) Method blocked on a Wait() AML opcode
- *      5) Method blocked to acquire the global lock
- *      6) Method blocked to execute a serialized control method that is
- *          already executing
- *      7) About to invoke a user-installed opregion handler
+ * DESCRIPTION: Exit the interpreter execution region. This is the top level
+ *              routine used to exit the interpreter when all processing has
+ *              been completed.
  *
  ******************************************************************************/
 
@@ -127,7 +152,46 @@ void acpi_ex_exit_interpreter(void)
 
         status = acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
         if (ACPI_FAILURE(status)) {
-                ACPI_ERROR((AE_INFO, "Could not release interpreter mutex"));
+                ACPI_ERROR((AE_INFO,
+                            "Could not release AML Interpreter mutex"));
+        }
+
+        return_VOID;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_relinquish_interpreter
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Exit the interpreter execution region, from within the
+ *              interpreter - before attempting an operation that will possibly
+ *              block the running thread.
+ *
+ * Cases where the interpreter is unlocked internally
+ *      1) Method to be blocked on a Sleep() AML opcode
+ *      2) Method to be blocked on an Acquire() AML opcode
+ *      3) Method to be blocked on a Wait() AML opcode
+ *      4) Method to be blocked to acquire the global lock
+ *      5) Method to be blocked waiting to execute a serialized control method
+ *          that is currently executing
+ *      6) About to invoke a user-installed opregion handler
+ *
+ ******************************************************************************/
+
+void acpi_ex_relinquish_interpreter(void)
+{
+        ACPI_FUNCTION_TRACE(ex_relinquish_interpreter);
+
+        /*
+         * If the global serialized flag is set, do not release the interpreter.
+         * This forces the interpreter to be single threaded.
+         */
+        if (!acpi_gbl_all_methods_serialized) {
+                acpi_ex_exit_interpreter();
         }
 
         return_VOID;
@@ -141,8 +205,8 @@ void acpi_ex_exit_interpreter(void)
  *
  * RETURN:      none
  *
- * DESCRIPTION: Truncate a number to 32-bits if the currently executing method
- *              belongs to a 32-bit ACPI table.
+ * DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is
+ *              32-bit, as determined by the revision of the DSDT.
  *
  ******************************************************************************/