+ 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)
+ */
+ status =
+ acpi_ex_system_wait_mutex(obj_desc->method.mutex->
+ mutex.os_mutex,
+ ACPI_WAIT_FOREVER);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Update the mutex and walk info and save the original sync_level */
+
+ 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 {
+ obj_desc->method.mutex->mutex.
+ original_sync_level =
+ obj_desc->method.mutex->mutex.sync_level;
+ }
+ }
+
+ /* Always increase acquisition depth */
+
+ obj_desc->method.mutex->mutex.acquisition_depth++;
+ }
+
+ /*
+ * Allocate an Owner ID for this method, only if this is the first thread
+ * to begin concurrent execution. We only need one owner_id, even if the
+ * method is invoked recursively.
+ */
+ if (!obj_desc->method.owner_id) {
+ status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id);
+ if (ACPI_FAILURE(status)) {
+ goto cleanup;
+ }