5 files changed, 67 insertions, 31 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index b23fe37f67c0..79078b8f5697 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -360,15 +360,14 @@ config ACPI_BGRT
 config ACPI_REDUCED_HARDWARE_ONLY
         bool "Hardware-reduced ACPI support only" if EXPERT
         def_bool n
-        depends on ACPI
         help
-        This config item changes the way the ACPI code is built.  When this
-        option is selected, the kernel will use a specialized version of
-        ACPICA that ONLY supports the ACPI "reduced hardware" mode.  The
-        resulting kernel will be smaller but it will also be restricted to
-        running in ACPI reduced hardware mode ONLY.
+          This config item changes the way the ACPI code is built.  When this
+          option is selected, the kernel will use a specialized version of
+          ACPICA that ONLY supports the ACPI "reduced hardware" mode.  The
+          resulting kernel will be smaller but it will also be restricted to
+          running in ACPI reduced hardware mode ONLY.
 
-        If you are unsure what to do, do not enable this option.
+          If you are unsure what to do, do not enable this option.
 
 source "drivers/acpi/apei/Kconfig"
 
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 9964f70be98d..f9eeae871593 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -436,7 +436,7 @@ static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 {
         if (!map->refcount) {
-                synchronize_rcu();
+                synchronize_rcu_expedited();
                 acpi_unmap(map->phys, map->virt);
                 kfree(map);
         }
@@ -1188,6 +1188,12 @@ EXPORT_SYMBOL(acpi_os_execute);
 
 void acpi_os_wait_events_complete(void)
 {
+        /*
+         * Make sure the GPE handler or the fixed event handler is not used
+         * on another CPU after removal.
+         */
+        if (acpi_irq_handler)
+                synchronize_hardirq(acpi_gbl_FADT.sci_interrupt);
         flush_workqueue(kacpid_wq);
         flush_workqueue(kacpi_notify_wq);
 }
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 6d5a6cda0734..93b81523a2fe 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -190,30 +190,24 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
         }
 }
 
-
 int __init
-acpi_table_parse_entries(char *id,
-                             unsigned long table_size,
-                             int entry_id,
-                             acpi_tbl_entry_handler handler,
-                             unsigned int max_entries)
+acpi_parse_entries(char *id, unsigned long table_size,
+                acpi_tbl_entry_handler handler,
+                struct acpi_table_header *table_header,
+                int entry_id, unsigned int max_entries)
 {
-        struct acpi_table_header *table_header = NULL;
         struct acpi_subtable_header *entry;
-        unsigned int count = 0;
+        int count = 0;
         unsigned long table_end;
-        acpi_size tbl_size;
 
         if (acpi_disabled)
                 return -ENODEV;
 
-        if (!handler)
+        if (!id || !handler)
                 return -EINVAL;
 
-        if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
-                acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size);
-        else
-                acpi_get_table_with_size(id, 0, &table_header, &tbl_size);
+        if (!table_size)
+                return -EINVAL;
 
         if (!table_header) {
                 pr_warn("%4.4s not present\n", id);
@@ -230,9 +224,12 @@ acpi_table_parse_entries(char *id,
         while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
                table_end) {
                 if (entry->type == entry_id
-                    && (!max_entries || count++ < max_entries))
+                    && (!max_entries || count < max_entries)) {
                         if (handler(entry, table_end))
-                                goto err;
+                                return -EINVAL;
+
+                        count++;
+                }
 
                 /*
                  * If entry->length is 0, break from this loop to avoid
@@ -240,22 +237,53 @@ acpi_table_parse_entries(char *id,
                  */
                 if (entry->length == 0) {
                         pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);
-                        goto err;
+                        return -EINVAL;
                 }
 
                 entry = (struct acpi_subtable_header *)
                     ((unsigned long)entry + entry->length);
         }
+
         if (max_entries && count > max_entries) {
                 pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n",
                         id, entry_id, count - max_entries, count);
         }
 
-        early_acpi_os_unmap_memory((char *)table_header, tbl_size);
         return count;
-err:
+}
+
+int __init
+acpi_table_parse_entries(char *id,
+                         unsigned long table_size,
+                         int entry_id,
+                         acpi_tbl_entry_handler handler,
+                         unsigned int max_entries)
+{
+        struct acpi_table_header *table_header = NULL;
+        acpi_size tbl_size;
+        int count;
+        u32 instance = 0;
+
+        if (acpi_disabled)
+                return -ENODEV;
+
+        if (!id || !handler)
+                return -EINVAL;
+
+        if (!strncmp(id, ACPI_SIG_MADT, 4))
+                instance = acpi_apic_instance;
+
+        acpi_get_table_with_size(id, instance, &table_header, &tbl_size);
+        if (!table_header) {
+                pr_warn("%4.4s not present\n", id);
+                return -ENODEV;
+        }
+
+        count = acpi_parse_entries(id, table_size, handler, table_header,
+                        entry_id, max_entries);
+
         early_acpi_os_unmap_memory((char *)table_header, tbl_size);
-        return -EINVAL;
+        return count;
 }
 
 int __init
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 371ac12d25b1..dd8ff63ee2b4 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -136,8 +136,7 @@ acpi_extract_package(union acpi_object *package,
                                 break;
                         case 'B':
                                 size_required +=
-                                    sizeof(u8 *) +
-                                    (element->buffer.length * sizeof(u8));
+                                    sizeof(u8 *) + element->buffer.length;
                                 tail_offset += sizeof(u8 *);
                                 break;
                         default:
@@ -255,7 +254,7 @@ acpi_extract_package(union acpi_object *package,
                                 memcpy(tail, element->buffer.pointer,
                                        element->buffer.length);
                                 head += sizeof(u8 *);
-                                tail += element->buffer.length * sizeof(u8);
+                                tail += element->buffer.length;
                                 break;
                         default:
                                 /* Should never get here */
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 10f2ed95645c..0ccaa093010c 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -124,6 +124,10 @@ int acpi_numa_init (void);
 
 int acpi_table_init (void);
 int acpi_table_parse(char *id, acpi_tbl_table_handler handler);
+int __init acpi_parse_entries(char *id, unsigned long table_size,
+                              acpi_tbl_entry_handler handler,
+                              struct acpi_table_header *table_header,
+                              int entry_id, unsigned int max_entries);
 int __init acpi_table_parse_entries(char *id, unsigned long table_size,
                                     int entry_id,
                                     acpi_tbl_entry_handler handler,