8 files changed, 196 insertions, 134 deletions

diff --git a/drivers/acpi/dispatcher/dsmethod.c b/drivers/acpi/dispatcher/dsmethod.c
index 1cbe61905824..c50c0cd5d717 100644
--- a/drivers/acpi/dispatcher/dsmethod.c
+++ b/drivers/acpi/dispatcher/dsmethod.c
@@ -232,9 +232,9 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node,
                  * recursive call.
                  */
                 if (!walk_state ||
-                    !obj_desc->method.mutex->mutex.owner_thread ||
-                    (walk_state->thread !=
-                     obj_desc->method.mutex->mutex.owner_thread)) {
+                    !obj_desc->method.mutex->mutex.thread_id ||
+                    (walk_state->thread->thread_id !=
+                     obj_desc->method.mutex->mutex.thread_id)) {
                         /*
                          * Acquire the method mutex. This releases the interpreter if we
                          * block (and reacquires it before it returns)
@@ -254,8 +254,8 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node,
                                     original_sync_level =
                                     walk_state->thread->current_sync_level;
 
-                                obj_desc->method.mutex->mutex.owner_thread =
-                                    walk_state->thread;
+                                obj_desc->method.mutex->mutex.thread_id =
+                                    walk_state->thread->thread_id;
                                 walk_state->thread->current_sync_level =
                                     obj_desc->method.sync_level;
                         } else {
@@ -569,7 +569,7 @@ acpi_ds_terminate_control_method(union acpi_operand_object *method_desc,
 
                         acpi_os_release_mutex(method_desc->method.mutex->mutex.
                                               os_mutex);
-                        method_desc->method.mutex->mutex.owner_thread = NULL;
+                        method_desc->method.mutex->mutex.thread_id = 0;
                 }
         }
 
diff --git a/drivers/acpi/events/evmisc.c b/drivers/acpi/events/evmisc.c
index 21cb749d0c75..2d34663dc1ed 100644
--- a/drivers/acpi/events/evmisc.c
+++ b/drivers/acpi/events/evmisc.c
@@ -439,7 +439,8 @@ acpi_status acpi_ev_acquire_global_lock(u16 timeout)
          * Only one thread can acquire the GL at a time, the global_lock_mutex
          * enforces this. This interface releases the interpreter if we must wait.
          */
-        status = acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex, 0);
+        status = acpi_ex_system_wait_mutex(
+                        acpi_gbl_global_lock_mutex->mutex.os_mutex, 0);
         if (status == AE_TIME) {
                 if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) {
                         acpi_ev_global_lock_acquired++;
@@ -448,9 +449,9 @@ acpi_status acpi_ev_acquire_global_lock(u16 timeout)
         }
 
         if (ACPI_FAILURE(status)) {
-                status =
-                    acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex,
-                                              timeout);
+                status = acpi_ex_system_wait_mutex(
+                                acpi_gbl_global_lock_mutex->mutex.os_mutex,
+                                timeout);
         }
         if (ACPI_FAILURE(status)) {
                 return_ACPI_STATUS(status);
@@ -555,7 +556,7 @@ acpi_status acpi_ev_release_global_lock(void)
         /* Release the local GL mutex */
         acpi_ev_global_lock_thread_id = NULL;
         acpi_ev_global_lock_acquired = 0;
-        acpi_os_release_mutex(acpi_gbl_global_lock_mutex);
+        acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex);
         return_ACPI_STATUS(status);
 }
 
diff --git a/drivers/acpi/events/evxface.c b/drivers/acpi/events/evxface.c
index 6d866a01f5f4..dbf34a5fc1e0 100644
--- a/drivers/acpi/events/evxface.c
+++ b/drivers/acpi/events/evxface.c
@@ -758,6 +758,12 @@ ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
  *
  * DESCRIPTION: Acquire the ACPI Global Lock
  *
+ * Note: Allows callers with the same thread ID to acquire the global lock
+ * multiple times. In other words, externally, the behavior of the global lock
+ * is identical to an AML mutex. On the first acquire, a new handle is
+ * returned. On any subsequent calls to acquire by the same thread, the same
+ * handle is returned.
+ *
  ******************************************************************************/
 acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
 {
@@ -770,14 +776,26 @@ acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
         /* Must lock interpreter to prevent race conditions */
 
         acpi_ex_enter_interpreter();
-        status = acpi_ev_acquire_global_lock(timeout);
-        acpi_ex_exit_interpreter();
+
+        status = acpi_ex_acquire_mutex_object(timeout,
+                                              acpi_gbl_global_lock_mutex,
+                                              acpi_os_get_thread_id());
 
         if (ACPI_SUCCESS(status)) {
-                acpi_gbl_global_lock_handle++;
+                /*
+                 * If this was the first acquisition of the Global Lock by this thread,
+                 * create a new handle. Otherwise, return the existing handle.
+                 */
+                if (acpi_gbl_global_lock_mutex->mutex.acquisition_depth == 1) {
+                        acpi_gbl_global_lock_handle++;
+                }
+
+                /* Return the global lock handle */
+
                 *handle = acpi_gbl_global_lock_handle;
         }
 
+        acpi_ex_exit_interpreter();
         return (status);
 }
 
@@ -802,7 +820,7 @@ acpi_status acpi_release_global_lock(u32 handle)
                 return (AE_NOT_ACQUIRED);
         }
 
-        status = acpi_ev_release_global_lock();
+        status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
         return (status);
 }
 
diff --git a/drivers/acpi/executer/exfield.c b/drivers/acpi/executer/exfield.c
index 2d88a3d8d1ad..e66b367c4fb6 100644
--- a/drivers/acpi/executer/exfield.c
+++ b/drivers/acpi/executer/exfield.c
@@ -71,7 +71,6 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
         union acpi_operand_object *buffer_desc;
         acpi_size length;
         void *buffer;
-        u8 locked;
 
         ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
 
@@ -111,9 +110,7 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
 
                 /* Lock entire transaction if requested */
 
-                locked =
-                    acpi_ex_acquire_global_lock(obj_desc->common_field.
-                                                field_flags);
+                acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
 
                 /*
                  * Perform the read.
@@ -125,7 +122,7 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
                                                              buffer.pointer),
                                                ACPI_READ | (obj_desc->field.
                                                             attribute << 16));
-                acpi_ex_release_global_lock(locked);
+                acpi_ex_release_global_lock();
                 goto exit;
         }
 
@@ -175,13 +172,12 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
 
         /* Lock entire transaction if requested */
 
-        locked =
-            acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
+        acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
 
         /* Read from the field */
 
         status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
-        acpi_ex_release_global_lock(locked);
+        acpi_ex_release_global_lock();
 
       exit:
         if (ACPI_FAILURE(status)) {
@@ -217,7 +213,6 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
         u32 required_length;
         void *buffer;
         void *new_buffer;
-        u8 locked;
         union acpi_operand_object *buffer_desc;
 
         ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
@@ -278,9 +273,7 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
 
                 /* Lock entire transaction if requested */
 
-                locked =
-                    acpi_ex_acquire_global_lock(obj_desc->common_field.
-                                                field_flags);
+                acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
 
                 /*
                  * Perform the write (returns status and perhaps data in the
@@ -291,7 +284,7 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
                                                (acpi_integer *) buffer,
                                                ACPI_WRITE | (obj_desc->field.
                                                              attribute << 16));
-                acpi_ex_release_global_lock(locked);
+                acpi_ex_release_global_lock();
 
                 *result_desc = buffer_desc;
                 return_ACPI_STATUS(status);
@@ -366,13 +359,12 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
 
         /* Lock entire transaction if requested */
 
-        locked =
-            acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
+        acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
 
         /* Write to the field */
 
         status = acpi_ex_insert_into_field(obj_desc, buffer, length);
-        acpi_ex_release_global_lock(locked);
+        acpi_ex_release_global_lock();
 
         /* Free temporary buffer if we used one */
 
diff --git a/drivers/acpi/executer/exmutex.c b/drivers/acpi/executer/exmutex.c
index 6748e3ef0997..0bebe751aac5 100644
--- a/drivers/acpi/executer/exmutex.c
+++ b/drivers/acpi/executer/exmutex.c
@@ -126,6 +126,66 @@ acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_ex_acquire_mutex_object
+ *
+ * PARAMETERS:  time_desc           - Timeout in milliseconds
+ *              obj_desc            - Mutex object
+ *              Thread              - Current thread state
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Acquire an AML mutex, low-level interface
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_acquire_mutex_object(u16 timeout,
+                             union acpi_operand_object *obj_desc,
+                             acpi_thread_id thread_id)
+{
+        acpi_status status;
+
+        ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex_object, obj_desc);
+
+        /* Support for multiple acquires by the owning thread */
+
+        if (obj_desc->mutex.thread_id == 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 */
+
+        if (obj_desc == acpi_gbl_global_lock_mutex) {
+                status = acpi_ev_acquire_global_lock(timeout);
+        } else {
+                status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
+                                                   timeout);
+        }
+
+        if (ACPI_FAILURE(status)) {
+
+                /* Includes failure from a timeout on time_desc */
+
+                return_ACPI_STATUS(status);
+        }
+
+        /* Have the mutex: update mutex and save the sync_level */
+
+        obj_desc->mutex.thread_id = thread_id;
+        obj_desc->mutex.acquisition_depth = 1;
+        obj_desc->mutex.original_sync_level = 0;
+        obj_desc->mutex.owner_thread = NULL;    /* Used only for AML Acquire() */
+
+        return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_ex_acquire_mutex
  *
  * PARAMETERS:  time_desc           - Timeout integer
@@ -161,7 +221,7 @@ acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
         }
 
         /*
-         * Current Sync must be less than or equal to the sync level of the
+         * Current Sync level must be less than or equal to the sync level of the
          * mutex. This mechanism provides some deadlock prevention
          */
         if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) {
@@ -172,51 +232,70 @@ acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
                 return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
         }
 
-        /* Support for multiple acquires by the owning thread */
+        status = acpi_ex_acquire_mutex_object((u16) time_desc->integer.value,
+                                              obj_desc,
+                                              walk_state->thread->thread_id);
+        if (ACPI_SUCCESS(status) && obj_desc->mutex.acquisition_depth == 1) {
+                obj_desc->mutex.owner_thread = walk_state->thread;
+                obj_desc->mutex.original_sync_level =
+                    walk_state->thread->current_sync_level;
+                walk_state->thread->current_sync_level =
+                    obj_desc->mutex.sync_level;
 
-        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);
-                }
+                /* Link the mutex to the current thread for force-unlock at method exit */
+
+                acpi_ex_link_mutex(obj_desc, walk_state->thread);
         }
 
-        /* Acquire the mutex, wait if necessary. Special case for Global Lock */
+        return_ACPI_STATUS(status);
+}
 
-        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);
-        }
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_release_mutex_object
+ *
+ * PARAMETERS:  obj_desc            - The object descriptor for this op
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Release a previously acquired Mutex, low level interface.
+ *
+ ******************************************************************************/
 
-        if (ACPI_FAILURE(status)) {
+acpi_status acpi_ex_release_mutex_object(union acpi_operand_object *obj_desc)
+{
+        acpi_status status = AE_OK;
 
-                /* Includes failure from a timeout on time_desc */
+        ACPI_FUNCTION_TRACE(ex_release_mutex_object);
 
-                return_ACPI_STATUS(status);
+        /* Match multiple Acquires with multiple Releases */
+
+        obj_desc->mutex.acquisition_depth--;
+        if (obj_desc->mutex.acquisition_depth != 0) {
+
+                /* Just decrement the depth and return */
+
+                return_ACPI_STATUS(AE_OK);
         }
 
-        /* Have the mutex: update mutex and walk info and save the sync_level */
+        if (obj_desc->mutex.owner_thread) {
 
-        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;
+                /* Unlink the mutex from the owner's list */
+
+                acpi_ex_unlink_mutex(obj_desc);
+                obj_desc->mutex.owner_thread = NULL;
+        }
 
-        walk_state->thread->current_sync_level = obj_desc->mutex.sync_level;
+        /* Release the mutex, special case for Global Lock */
 
-        /* Link the mutex to the current thread for force-unlock at method exit */
+        if (obj_desc == acpi_gbl_global_lock_mutex) {
+                status = acpi_ev_release_global_lock();
+        } else {
+                acpi_os_release_mutex(obj_desc->mutex.os_mutex);
+        }
 
-        acpi_ex_link_mutex(obj_desc, walk_state->thread);
-        return_ACPI_STATUS(AE_OK);
+        obj_desc->mutex.thread_id = 0;
+        return_ACPI_STATUS(status);
 }
 
 /*******************************************************************************
@@ -253,22 +332,13 @@ 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 */
-
-        if (!walk_state->thread) {
-                ACPI_ERROR((AE_INFO,
-                            "Cannot release Mutex [%4.4s], null thread info",
-                            acpi_ut_get_node_name(obj_desc->mutex.node)));
-                return_ACPI_STATUS(AE_AML_INTERNAL);
-        }
-
         /*
          * 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->thread_id !=
              walk_state->thread->thread_id)
-            && (obj_desc->mutex.os_mutex != acpi_gbl_global_lock_mutex)) {
+            && (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,
@@ -278,6 +348,15 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
                 return_ACPI_STATUS(AE_AML_NOT_OWNER);
         }
 
+        /* Sanity check: we must have a valid thread ID */
+
+        if (!walk_state->thread) {
+                ACPI_ERROR((AE_INFO,
+                            "Cannot release Mutex [%4.4s], null thread info",
+                            acpi_ut_get_node_name(obj_desc->mutex.node)));
+                return_ACPI_STATUS(AE_AML_INTERNAL);
+        }
+
         /*
          * The sync level of the mutex must be less than or equal to the current
          * sync level
@@ -289,34 +368,12 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
                 return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
         }
 
-        /* Match multiple Acquires with multiple Releases */
-
-        obj_desc->mutex.acquisition_depth--;
-        if (obj_desc->mutex.acquisition_depth != 0) {
-
-                /* Just decrement the depth and return */
-
-                return_ACPI_STATUS(AE_OK);
-        }
-
-        /* Unlink the mutex from the owner's list */
+        status = acpi_ex_release_mutex_object(obj_desc);
 
-        acpi_ex_unlink_mutex(obj_desc);
-
-        /* Release the mutex, special case for Global Lock */
+        /* Restore sync_level */
 
-        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 restore sync_level */
-
-        obj_desc->mutex.owner_thread = NULL;
         walk_state->thread->current_sync_level =
             obj_desc->mutex.original_sync_level;
-
         return_ACPI_STATUS(status);
 }
 
@@ -357,7 +414,7 @@ void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread)
 
                 /* Release the mutex, special case for Global Lock */
 
-                if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
+                if (obj_desc == acpi_gbl_global_lock_mutex) {
 
                         /* Ignore errors */
 
@@ -369,6 +426,7 @@ void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread)
                 /* Mark mutex unowned */
 
                 obj_desc->mutex.owner_thread = NULL;
+                obj_desc->mutex.thread_id = 0;
 
                 /* Update Thread sync_level (Last mutex is the important one) */
 
diff --git a/drivers/acpi/executer/exutils.c b/drivers/acpi/executer/exutils.c
index 6b0aeccbb69b..c0837af0acb1 100644
--- a/drivers/acpi/executer/exutils.c
+++ b/drivers/acpi/executer/exutils.c
@@ -240,72 +240,66 @@ void acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc)
  * PARAMETERS:  field_flags           - Flags with Lock rule:
  *                                      always_lock or never_lock
  *
- * RETURN:      TRUE/FALSE indicating whether the lock was actually acquired
+ * RETURN:      None
  *
- * DESCRIPTION: Obtain the global lock and keep track of this fact via two
- *              methods.  A global variable keeps the state of the lock, and
- *              the state is returned to the caller.
+ * DESCRIPTION: Obtain the ACPI hardware Global Lock, only if the field
+ *              flags specifiy that it is to be obtained before field access.
  *
  ******************************************************************************/
 
-u8 acpi_ex_acquire_global_lock(u32 field_flags)
+void acpi_ex_acquire_global_lock(u32 field_flags)
 {
-        u8 locked = FALSE;
         acpi_status status;
 
         ACPI_FUNCTION_TRACE(ex_acquire_global_lock);
 
-        /* Only attempt lock if the always_lock bit is set */
+        /* Only use the lock if the always_lock bit is set */
+
+        if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) {
+                return_VOID;
+        }
 
-        if (field_flags & AML_FIELD_LOCK_RULE_MASK) {
+        /* Attempt to get the global lock, wait forever */
 
-                /* We should attempt to get the lock, wait forever */
+        status = acpi_ex_acquire_mutex_object(ACPI_WAIT_FOREVER,
+                                              acpi_gbl_global_lock_mutex,
+                                              acpi_os_get_thread_id());
 
-                status = acpi_ev_acquire_global_lock(ACPI_WAIT_FOREVER);
-                if (ACPI_SUCCESS(status)) {
-                        locked = TRUE;
-                } else {
-                        ACPI_EXCEPTION((AE_INFO, status,
-                                        "Could not acquire Global Lock"));
-                }
+        if (ACPI_FAILURE(status)) {
+                ACPI_EXCEPTION((AE_INFO, status,
+                                "Could not acquire Global Lock"));
         }
 
-        return_UINT8(locked);
+        return_VOID;
 }
 
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ex_release_global_lock
  *
- * PARAMETERS:  locked_by_me    - Return value from corresponding call to
- *                                acquire_global_lock.
+ * PARAMETERS:  None
  *
  * RETURN:      None
  *
- * DESCRIPTION: Release the global lock if it is locked.
+ * DESCRIPTION: Release the ACPI hardware Global Lock
  *
  ******************************************************************************/
 
-void acpi_ex_release_global_lock(u8 locked_by_me)
+void acpi_ex_release_global_lock(void)
 {
         acpi_status status;
 
         ACPI_FUNCTION_TRACE(ex_release_global_lock);
 
-        /* Only attempt unlock if the caller locked it */
-
-        if (locked_by_me) {
+        /* Release the global lock */
 
-                /* OK, now release the lock */
-
-                status = acpi_ev_release_global_lock();
-                if (ACPI_FAILURE(status)) {
+        status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
+        if (ACPI_FAILURE(status)) {
 
-                        /* Report the error, but there isn't much else we can do */
+                /* Report the error, but there isn't much else we can do */
 
-                        ACPI_EXCEPTION((AE_INFO, status,
-                                        "Could not release ACPI Global Lock"));
-                }
+                ACPI_EXCEPTION((AE_INFO, status,
+                                "Could not release Global Lock"));
         }
 
         return_VOID;
diff --git a/drivers/acpi/namespace/nsaccess.c b/drivers/acpi/namespace/nsaccess.c
index 57faf598bad8..32a01673cae8 100644
--- a/drivers/acpi/namespace/nsaccess.c
+++ b/drivers/acpi/namespace/nsaccess.c
@@ -208,8 +208,7 @@ acpi_status acpi_ns_root_initialize(void)
                                 /* Special case for ACPI Global Lock */
 
                                 if (ACPI_STRCMP(init_val->name, "_GL_") == 0) {
-                                        acpi_gbl_global_lock_mutex =
-                                            obj_desc->mutex.os_mutex;
+                                        acpi_gbl_global_lock_mutex = obj_desc;
 
                                         /* Create additional counting semaphore for global lock */
 
diff --git a/drivers/acpi/utilities/utdelete.c b/drivers/acpi/utilities/utdelete.c
index f777cebdc46d..dcb34f805714 100644
--- a/drivers/acpi/utilities/utdelete.c
+++ b/drivers/acpi/utilities/utdelete.c
@@ -158,7 +158,7 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
                                   "***** Mutex %p, OS Mutex %p\n",
                                   object, object->mutex.os_mutex));
 
-                if (object->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
+                if (object == acpi_gbl_global_lock_mutex) {
 
                         /* Global Lock has extra semaphore */