Pull bugzilla-8385 into release branch

1 files changed, 7 insertions, 5 deletions

diff --git a/drivers/acpi/dispatcher/dsmethod.c b/drivers/acpi/dispatcher/dsmethod.c
index 1683e5c5b94c..1cbe61905824 100644
--- a/drivers/acpi/dispatcher/dsmethod.c
+++ b/drivers/acpi/dispatcher/dsmethod.c
@@ -231,8 +231,10 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node,
                  * Obtain the method mutex if necessary. Do not acquire mutex for a
                  * recursive call.
                  */
-                if (acpi_os_get_thread_id() !=
-                    obj_desc->method.mutex->mutex.owner_thread_id) {
+                if (!walk_state ||
+                    !obj_desc->method.mutex->mutex.owner_thread ||
+                    (walk_state->thread !=
+                     obj_desc->method.mutex->mutex.owner_thread)) {
                         /*
                          * Acquire the method mutex. This releases the interpreter if we
                          * block (and reacquires it before it returns)
@@ -246,14 +248,14 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node,
                         }
 
                         /* Update the mutex and walk info and save the original sync_level */
-                        obj_desc->method.mutex->mutex.owner_thread_id =
-                                acpi_os_get_thread_id();
 
                         if (walk_state) {
                                 obj_desc->method.mutex->mutex.
                                     original_sync_level =
                                     walk_state->thread->current_sync_level;
 
+                                obj_desc->method.mutex->mutex.owner_thread =
+                                    walk_state->thread;
                                 walk_state->thread->current_sync_level =
                                     obj_desc->method.sync_level;
                         } else {
@@ -567,7 +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_id = ACPI_MUTEX_NOT_ACQUIRED;
+                        method_desc->method.mutex->mutex.owner_thread = NULL;
                 }
         }