1 files changed, 52 insertions, 34 deletions

diff --git a/drivers/acpi/executer/exmutex.c b/drivers/acpi/executer/exmutex.c
index bf90f04f2c60..5101bad5baf8 100644
--- a/drivers/acpi/executer/exmutex.c
+++ b/drivers/acpi/executer/exmutex.c
@@ -6,7 +6,7 @@
  *****************************************************************************/
 
 /*
- * Copyright (C) 2000 - 2006, R. Byron Moore
+ * Copyright (C) 2000 - 2007, R. Byron Moore
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -44,6 +44,7 @@
 
 #include <acpi/acpi.h>
 #include <acpi/acinterp.h>
+#include <acpi/acevents.h>
 
 #define _COMPONENT          ACPI_EXECUTER
 ACPI_MODULE_NAME("exmutex")
@@ -150,7 +151,7 @@ acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
                 return_ACPI_STATUS(AE_BAD_PARAMETER);
         }
 
-        /* Sanity check -- we must have a valid thread ID */
+        /* Sanity check: we must have a valid thread ID */
 
         if (!walk_state->thread) {
                 ACPI_ERROR((AE_INFO,
@@ -174,24 +175,28 @@ acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
         /* Support for multiple acquires by the owning thread */
 
         if (obj_desc->mutex.owner_thread) {
-
-                /* Special case for Global Lock, allow all threads */
-
-                if ((obj_desc->mutex.owner_thread->thread_id ==
-                     walk_state->thread->thread_id) ||
-                    (obj_desc->mutex.os_mutex == ACPI_GLOBAL_LOCK)) {
+                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
+                         * 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 */
+        /* Acquire the mutex, wait if necessary. Special case for Global Lock */
+
+        if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
+                status =
+                    acpi_ev_acquire_global_lock((u16) time_desc->integer.value);
+        } else {
+                status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
+                                                   (u16) time_desc->integer.
+                                                   value);
+        }
 
-        status = acpi_ex_system_acquire_mutex(time_desc, obj_desc);
         if (ACPI_FAILURE(status)) {
 
                 /* Includes failure from a timeout on time_desc */
@@ -211,7 +216,6 @@ acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
         /* Link the mutex to the current thread for force-unlock at method exit */
 
         acpi_ex_link_mutex(obj_desc, walk_state->thread);
-
         return_ACPI_STATUS(AE_OK);
 }
 
@@ -232,7 +236,7 @@ acpi_status
 acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
                       struct acpi_walk_state *walk_state)
 {
-        acpi_status status;
+        acpi_status status = AE_OK;
 
         ACPI_FUNCTION_TRACE(ex_release_mutex);
 
@@ -249,7 +253,7 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
                 return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED);
         }
 
-        /* Sanity check -- we must have a valid thread ID */
+        /* Sanity check: we must have a valid thread ID */
 
         if (!walk_state->thread) {
                 ACPI_ERROR((AE_INFO,
@@ -264,7 +268,7 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
          */
         if ((obj_desc->mutex.owner_thread->thread_id !=
              walk_state->thread->thread_id)
-            && (obj_desc->mutex.os_mutex != ACPI_GLOBAL_LOCK)) {
+            && (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,
@@ -274,8 +278,8 @@ 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 less than or equal to the current
+         * sync level
          */
         if (obj_desc->mutex.sync_level > walk_state->thread->current_sync_level) {
                 ACPI_ERROR((AE_INFO,
@@ -298,11 +302,15 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
 
         acpi_ex_unlink_mutex(obj_desc);
 
-        /* Release the mutex */
+        /* Release the mutex, special case for Global Lock */
 
-        status = acpi_ex_system_release_mutex(obj_desc);
+        if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
+                status = acpi_ev_release_global_lock();
+        } else {
+                acpi_os_release_mutex(obj_desc->mutex.os_mutex);
+        }
 
-        /* Update the mutex and walk state, restore sync_level before acquire */
+        /* Update the mutex and restore sync_level */
 
         obj_desc->mutex.owner_thread = NULL;
         walk_state->thread->current_sync_level =
@@ -321,39 +329,49 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
  *
  * DESCRIPTION: Release all mutexes held by this thread
  *
+ * NOTE: This function is called as the thread is exiting the interpreter.
+ * Mutexes are not released when an individual control method is exited, but
+ * only when the parent thread actually exits the interpreter. This allows one
+ * method to acquire a mutex, and a different method to release it, as long as
+ * this is performed underneath a single parent control method.
+ *
  ******************************************************************************/
 
 void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread)
 {
         union acpi_operand_object *next = thread->acquired_mutex_list;
-        union acpi_operand_object *this;
-        acpi_status status;
+        union acpi_operand_object *obj_desc;
 
         ACPI_FUNCTION_ENTRY();
 
         /* Traverse the list of owned mutexes, releasing each one */
 
         while (next) {
-                this = next;
-                next = this->mutex.next;
+                obj_desc = next;
+                next = obj_desc->mutex.next;
+
+                obj_desc->mutex.prev = NULL;
+                obj_desc->mutex.next = NULL;
+                obj_desc->mutex.acquisition_depth = 0;
+
+                /* Release the mutex, special case for Global Lock */
 
-                this->mutex.acquisition_depth = 1;
-                this->mutex.prev = NULL;
-                this->mutex.next = NULL;
+                if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
 
-                /* Release the mutex */
+                        /* Ignore errors */
 
-                status = acpi_ex_system_release_mutex(this);
-                if (ACPI_FAILURE(status)) {
-                        continue;
+                        (void)acpi_ev_release_global_lock();
+                } else {
+                        acpi_os_release_mutex(obj_desc->mutex.os_mutex);
                 }
 
                 /* Mark mutex unowned */
 
-                this->mutex.owner_thread = NULL;
+                obj_desc->mutex.owner_thread = NULL;
 
                 /* Update Thread sync_level (Last mutex is the important one) */
 
-                thread->current_sync_level = this->mutex.original_sync_level;
+                thread->current_sync_level =
+                    obj_desc->mutex.original_sync_level;
         }
 }