Linux 4.1.16
[linux/fpc-iii.git] / drivers / acpi / acpica / dsmethod.c
blobd72565a3c646ddb6b4c819019da46b3320f19024
1 /******************************************************************************
3 * Module Name: dsmethod - Parser/Interpreter interface - control method parsing
5 *****************************************************************************/
7 /*
8 * Copyright (C) 2000 - 2015, Intel Corp.
9 * All rights reserved.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acdispat.h"
47 #include "acinterp.h"
48 #include "acnamesp.h"
49 #ifdef ACPI_DISASSEMBLER
50 #include "acdisasm.h"
51 #endif
52 #include "acparser.h"
53 #include "amlcode.h"
55 #define _COMPONENT ACPI_DISPATCHER
56 ACPI_MODULE_NAME("dsmethod")
58 /* Local prototypes */
59 static acpi_status
60 acpi_ds_detect_named_opcodes(struct acpi_walk_state *walk_state,
61 union acpi_parse_object **out_op);
63 static acpi_status
64 acpi_ds_create_method_mutex(union acpi_operand_object *method_desc);
66 /*******************************************************************************
68 * FUNCTION: acpi_ds_auto_serialize_method
70 * PARAMETERS: node - Namespace Node of the method
71 * obj_desc - Method object attached to node
73 * RETURN: Status
75 * DESCRIPTION: Parse a control method AML to scan for control methods that
76 * need serialization due to the creation of named objects.
78 * NOTE: It is a bit of overkill to mark all such methods serialized, since
79 * there is only a problem if the method actually blocks during execution.
80 * A blocking operation is, for example, a Sleep() operation, or any access
81 * to an operation region. However, it is probably not possible to easily
82 * detect whether a method will block or not, so we simply mark all suspicious
83 * methods as serialized.
85 * NOTE2: This code is essentially a generic routine for parsing a single
86 * control method.
88 ******************************************************************************/
90 acpi_status
91 acpi_ds_auto_serialize_method(struct acpi_namespace_node *node,
92 union acpi_operand_object *obj_desc)
94 acpi_status status;
95 union acpi_parse_object *op = NULL;
96 struct acpi_walk_state *walk_state;
98 ACPI_FUNCTION_TRACE_PTR(ds_auto_serialize_method, node);
100 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
101 "Method auto-serialization parse [%4.4s] %p\n",
102 acpi_ut_get_node_name(node), node));
104 /* Create/Init a root op for the method parse tree */
106 op = acpi_ps_alloc_op(AML_METHOD_OP);
107 if (!op) {
108 return_ACPI_STATUS(AE_NO_MEMORY);
111 acpi_ps_set_name(op, node->name.integer);
112 op->common.node = node;
114 /* Create and initialize a new walk state */
116 walk_state =
117 acpi_ds_create_walk_state(node->owner_id, NULL, NULL, NULL);
118 if (!walk_state) {
119 return_ACPI_STATUS(AE_NO_MEMORY);
122 status =
123 acpi_ds_init_aml_walk(walk_state, op, node,
124 obj_desc->method.aml_start,
125 obj_desc->method.aml_length, NULL, 0);
126 if (ACPI_FAILURE(status)) {
127 acpi_ds_delete_walk_state(walk_state);
128 return_ACPI_STATUS(status);
131 walk_state->descending_callback = acpi_ds_detect_named_opcodes;
133 /* Parse the method, scan for creation of named objects */
135 status = acpi_ps_parse_aml(walk_state);
136 if (ACPI_FAILURE(status)) {
137 return_ACPI_STATUS(status);
140 acpi_ps_delete_parse_tree(op);
141 return_ACPI_STATUS(status);
144 /*******************************************************************************
146 * FUNCTION: acpi_ds_detect_named_opcodes
148 * PARAMETERS: walk_state - Current state of the parse tree walk
149 * out_op - Unused, required for parser interface
151 * RETURN: Status
153 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
154 * Currently used to detect methods that must be marked serialized
155 * in order to avoid problems with the creation of named objects.
157 ******************************************************************************/
159 static acpi_status
160 acpi_ds_detect_named_opcodes(struct acpi_walk_state *walk_state,
161 union acpi_parse_object **out_op)
164 ACPI_FUNCTION_NAME(acpi_ds_detect_named_opcodes);
166 /* We are only interested in opcodes that create a new name */
168 if (!
169 (walk_state->op_info->
170 flags & (AML_NAMED | AML_CREATE | AML_FIELD))) {
171 return (AE_OK);
175 * At this point, we know we have a Named object opcode.
176 * Mark the method as serialized. Later code will create a mutex for
177 * this method to enforce serialization.
179 * Note, ACPI_METHOD_IGNORE_SYNC_LEVEL flag means that we will ignore the
180 * Sync Level mechanism for this method, even though it is now serialized.
181 * Otherwise, there can be conflicts with existing ASL code that actually
182 * uses sync levels.
184 walk_state->method_desc->method.sync_level = 0;
185 walk_state->method_desc->method.info_flags |=
186 (ACPI_METHOD_SERIALIZED | ACPI_METHOD_IGNORE_SYNC_LEVEL);
188 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
189 "Method serialized [%4.4s] %p - [%s] (%4.4X)\n",
190 walk_state->method_node->name.ascii,
191 walk_state->method_node, walk_state->op_info->name,
192 walk_state->opcode));
194 /* Abort the parse, no need to examine this method any further */
196 return (AE_CTRL_TERMINATE);
199 /*******************************************************************************
201 * FUNCTION: acpi_ds_method_error
203 * PARAMETERS: status - Execution status
204 * walk_state - Current state
206 * RETURN: Status
208 * DESCRIPTION: Called on method error. Invoke the global exception handler if
209 * present, dump the method data if the disassembler is configured
211 * Note: Allows the exception handler to change the status code
213 ******************************************************************************/
215 acpi_status
216 acpi_ds_method_error(acpi_status status, struct acpi_walk_state * walk_state)
218 ACPI_FUNCTION_ENTRY();
220 /* Ignore AE_OK and control exception codes */
222 if (ACPI_SUCCESS(status) || (status & AE_CODE_CONTROL)) {
223 return (status);
226 /* Invoke the global exception handler */
228 if (acpi_gbl_exception_handler) {
230 /* Exit the interpreter, allow handler to execute methods */
232 acpi_ex_exit_interpreter();
235 * Handler can map the exception code to anything it wants, including
236 * AE_OK, in which case the executing method will not be aborted.
238 status = acpi_gbl_exception_handler(status,
239 walk_state->method_node ?
240 walk_state->method_node->
241 name.integer : 0,
242 walk_state->opcode,
243 walk_state->aml_offset,
244 NULL);
245 acpi_ex_enter_interpreter();
248 acpi_ds_clear_implicit_return(walk_state);
250 #ifdef ACPI_DISASSEMBLER
251 if (ACPI_FAILURE(status)) {
253 /* Display method locals/args if disassembler is present */
255 acpi_dm_dump_method_info(status, walk_state, walk_state->op);
257 #endif
259 return (status);
262 /*******************************************************************************
264 * FUNCTION: acpi_ds_create_method_mutex
266 * PARAMETERS: obj_desc - The method object
268 * RETURN: Status
270 * DESCRIPTION: Create a mutex object for a serialized control method
272 ******************************************************************************/
274 static acpi_status
275 acpi_ds_create_method_mutex(union acpi_operand_object *method_desc)
277 union acpi_operand_object *mutex_desc;
278 acpi_status status;
280 ACPI_FUNCTION_TRACE(ds_create_method_mutex);
282 /* Create the new mutex object */
284 mutex_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX);
285 if (!mutex_desc) {
286 return_ACPI_STATUS(AE_NO_MEMORY);
289 /* Create the actual OS Mutex */
291 status = acpi_os_create_mutex(&mutex_desc->mutex.os_mutex);
292 if (ACPI_FAILURE(status)) {
293 acpi_ut_delete_object_desc(mutex_desc);
294 return_ACPI_STATUS(status);
297 mutex_desc->mutex.sync_level = method_desc->method.sync_level;
298 method_desc->method.mutex = mutex_desc;
299 return_ACPI_STATUS(AE_OK);
302 /*******************************************************************************
304 * FUNCTION: acpi_ds_begin_method_execution
306 * PARAMETERS: method_node - Node of the method
307 * obj_desc - The method object
308 * walk_state - current state, NULL if not yet executing
309 * a method.
311 * RETURN: Status
313 * DESCRIPTION: Prepare a method for execution. Parses the method if necessary,
314 * increments the thread count, and waits at the method semaphore
315 * for clearance to execute.
317 ******************************************************************************/
319 acpi_status
320 acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node,
321 union acpi_operand_object *obj_desc,
322 struct acpi_walk_state *walk_state)
324 acpi_status status = AE_OK;
326 ACPI_FUNCTION_TRACE_PTR(ds_begin_method_execution, method_node);
328 if (!method_node) {
329 return_ACPI_STATUS(AE_NULL_ENTRY);
332 /* Prevent wraparound of thread count */
334 if (obj_desc->method.thread_count == ACPI_UINT8_MAX) {
335 ACPI_ERROR((AE_INFO,
336 "Method reached maximum reentrancy limit (255)"));
337 return_ACPI_STATUS(AE_AML_METHOD_LIMIT);
341 * If this method is serialized, we need to acquire the method mutex.
343 if (obj_desc->method.info_flags & ACPI_METHOD_SERIALIZED) {
345 * Create a mutex for the method if it is defined to be Serialized
346 * and a mutex has not already been created. We defer the mutex creation
347 * until a method is actually executed, to minimize the object count
349 if (!obj_desc->method.mutex) {
350 status = acpi_ds_create_method_mutex(obj_desc);
351 if (ACPI_FAILURE(status)) {
352 return_ACPI_STATUS(status);
357 * The current_sync_level (per-thread) must be less than or equal to
358 * the sync level of the method. This mechanism provides some
359 * deadlock prevention.
361 * If the method was auto-serialized, we just ignore the sync level
362 * mechanism, because auto-serialization of methods can interfere
363 * with ASL code that actually uses sync levels.
365 * Top-level method invocation has no walk state at this point
367 if (walk_state &&
368 (!(obj_desc->method.
369 info_flags & ACPI_METHOD_IGNORE_SYNC_LEVEL))
370 && (walk_state->thread->current_sync_level >
371 obj_desc->method.mutex->mutex.sync_level)) {
372 ACPI_ERROR((AE_INFO,
373 "Cannot acquire Mutex for method [%4.4s], current SyncLevel is too large (%u)",
374 acpi_ut_get_node_name(method_node),
375 walk_state->thread->current_sync_level));
377 return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
381 * Obtain the method mutex if necessary. Do not acquire mutex for a
382 * recursive call.
384 if (!walk_state ||
385 !obj_desc->method.mutex->mutex.thread_id ||
386 (walk_state->thread->thread_id !=
387 obj_desc->method.mutex->mutex.thread_id)) {
389 * Acquire the method mutex. This releases the interpreter if we
390 * block (and reacquires it before it returns)
392 status =
393 acpi_ex_system_wait_mutex(obj_desc->method.mutex->
394 mutex.os_mutex,
395 ACPI_WAIT_FOREVER);
396 if (ACPI_FAILURE(status)) {
397 return_ACPI_STATUS(status);
400 /* Update the mutex and walk info and save the original sync_level */
402 if (walk_state) {
403 obj_desc->method.mutex->mutex.
404 original_sync_level =
405 walk_state->thread->current_sync_level;
407 obj_desc->method.mutex->mutex.thread_id =
408 walk_state->thread->thread_id;
409 walk_state->thread->current_sync_level =
410 obj_desc->method.sync_level;
411 } else {
412 obj_desc->method.mutex->mutex.
413 original_sync_level =
414 obj_desc->method.mutex->mutex.sync_level;
418 /* Always increase acquisition depth */
420 obj_desc->method.mutex->mutex.acquisition_depth++;
424 * Allocate an Owner ID for this method, only if this is the first thread
425 * to begin concurrent execution. We only need one owner_id, even if the
426 * method is invoked recursively.
428 if (!obj_desc->method.owner_id) {
429 status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id);
430 if (ACPI_FAILURE(status)) {
431 goto cleanup;
436 * Increment the method parse tree thread count since it has been
437 * reentered one more time (even if it is the same thread)
439 obj_desc->method.thread_count++;
440 acpi_method_count++;
441 return_ACPI_STATUS(status);
443 cleanup:
444 /* On error, must release the method mutex (if present) */
446 if (obj_desc->method.mutex) {
447 acpi_os_release_mutex(obj_desc->method.mutex->mutex.os_mutex);
449 return_ACPI_STATUS(status);
452 /*******************************************************************************
454 * FUNCTION: acpi_ds_call_control_method
456 * PARAMETERS: thread - Info for this thread
457 * this_walk_state - Current walk state
458 * op - Current Op to be walked
460 * RETURN: Status
462 * DESCRIPTION: Transfer execution to a called control method
464 ******************************************************************************/
466 acpi_status
467 acpi_ds_call_control_method(struct acpi_thread_state *thread,
468 struct acpi_walk_state *this_walk_state,
469 union acpi_parse_object *op)
471 acpi_status status;
472 struct acpi_namespace_node *method_node;
473 struct acpi_walk_state *next_walk_state = NULL;
474 union acpi_operand_object *obj_desc;
475 struct acpi_evaluate_info *info;
476 u32 i;
478 ACPI_FUNCTION_TRACE_PTR(ds_call_control_method, this_walk_state);
480 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
481 "Calling method %p, currentstate=%p\n",
482 this_walk_state->prev_op, this_walk_state));
485 * Get the namespace entry for the control method we are about to call
487 method_node = this_walk_state->method_call_node;
488 if (!method_node) {
489 return_ACPI_STATUS(AE_NULL_ENTRY);
492 obj_desc = acpi_ns_get_attached_object(method_node);
493 if (!obj_desc) {
494 return_ACPI_STATUS(AE_NULL_OBJECT);
497 /* Init for new method, possibly wait on method mutex */
499 status = acpi_ds_begin_method_execution(method_node, obj_desc,
500 this_walk_state);
501 if (ACPI_FAILURE(status)) {
502 return_ACPI_STATUS(status);
505 /* Begin method parse/execution. Create a new walk state */
507 next_walk_state = acpi_ds_create_walk_state(obj_desc->method.owner_id,
508 NULL, obj_desc, thread);
509 if (!next_walk_state) {
510 status = AE_NO_MEMORY;
511 goto cleanup;
515 * The resolved arguments were put on the previous walk state's operand
516 * stack. Operands on the previous walk state stack always
517 * start at index 0. Also, null terminate the list of arguments
519 this_walk_state->operands[this_walk_state->num_operands] = NULL;
522 * Allocate and initialize the evaluation information block
523 * TBD: this is somewhat inefficient, should change interface to
524 * ds_init_aml_walk. For now, keeps this struct off the CPU stack
526 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
527 if (!info) {
528 status = AE_NO_MEMORY;
529 goto cleanup;
532 info->parameters = &this_walk_state->operands[0];
534 status = acpi_ds_init_aml_walk(next_walk_state, NULL, method_node,
535 obj_desc->method.aml_start,
536 obj_desc->method.aml_length, info,
537 ACPI_IMODE_EXECUTE);
539 ACPI_FREE(info);
540 if (ACPI_FAILURE(status)) {
541 goto cleanup;
545 * Delete the operands on the previous walkstate operand stack
546 * (they were copied to new objects)
548 for (i = 0; i < obj_desc->method.param_count; i++) {
549 acpi_ut_remove_reference(this_walk_state->operands[i]);
550 this_walk_state->operands[i] = NULL;
553 /* Clear the operand stack */
555 this_walk_state->num_operands = 0;
557 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
558 "**** Begin nested execution of [%4.4s] **** WalkState=%p\n",
559 method_node->name.ascii, next_walk_state));
561 /* Invoke an internal method if necessary */
563 if (obj_desc->method.info_flags & ACPI_METHOD_INTERNAL_ONLY) {
564 status =
565 obj_desc->method.dispatch.implementation(next_walk_state);
566 if (status == AE_OK) {
567 status = AE_CTRL_TERMINATE;
571 return_ACPI_STATUS(status);
573 cleanup:
575 /* On error, we must terminate the method properly */
577 acpi_ds_terminate_control_method(obj_desc, next_walk_state);
578 if (next_walk_state) {
579 acpi_ds_delete_walk_state(next_walk_state);
582 return_ACPI_STATUS(status);
585 /*******************************************************************************
587 * FUNCTION: acpi_ds_restart_control_method
589 * PARAMETERS: walk_state - State for preempted method (caller)
590 * return_desc - Return value from the called method
592 * RETURN: Status
594 * DESCRIPTION: Restart a method that was preempted by another (nested) method
595 * invocation. Handle the return value (if any) from the callee.
597 ******************************************************************************/
599 acpi_status
600 acpi_ds_restart_control_method(struct acpi_walk_state *walk_state,
601 union acpi_operand_object *return_desc)
603 acpi_status status;
604 int same_as_implicit_return;
606 ACPI_FUNCTION_TRACE_PTR(ds_restart_control_method, walk_state);
608 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
609 "****Restart [%4.4s] Op %p ReturnValueFromCallee %p\n",
610 acpi_ut_get_node_name(walk_state->method_node),
611 walk_state->method_call_op, return_desc));
613 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
614 " ReturnFromThisMethodUsed?=%X ResStack %p Walk %p\n",
615 walk_state->return_used,
616 walk_state->results, walk_state));
618 /* Did the called method return a value? */
620 if (return_desc) {
622 /* Is the implicit return object the same as the return desc? */
624 same_as_implicit_return =
625 (walk_state->implicit_return_obj == return_desc);
627 /* Are we actually going to use the return value? */
629 if (walk_state->return_used) {
631 /* Save the return value from the previous method */
633 status = acpi_ds_result_push(return_desc, walk_state);
634 if (ACPI_FAILURE(status)) {
635 acpi_ut_remove_reference(return_desc);
636 return_ACPI_STATUS(status);
640 * Save as THIS method's return value in case it is returned
641 * immediately to yet another method
643 walk_state->return_desc = return_desc;
647 * The following code is the optional support for the so-called
648 * "implicit return". Some AML code assumes that the last value of the
649 * method is "implicitly" returned to the caller, in the absence of an
650 * explicit return value.
652 * Just save the last result of the method as the return value.
654 * NOTE: this is optional because the ASL language does not actually
655 * support this behavior.
657 else if (!acpi_ds_do_implicit_return
658 (return_desc, walk_state, FALSE)
659 || same_as_implicit_return) {
661 * Delete the return value if it will not be used by the
662 * calling method or remove one reference if the explicit return
663 * is the same as the implicit return value.
665 acpi_ut_remove_reference(return_desc);
669 return_ACPI_STATUS(AE_OK);
672 /*******************************************************************************
674 * FUNCTION: acpi_ds_terminate_control_method
676 * PARAMETERS: method_desc - Method object
677 * walk_state - State associated with the method
679 * RETURN: None
681 * DESCRIPTION: Terminate a control method. Delete everything that the method
682 * created, delete all locals and arguments, and delete the parse
683 * tree if requested.
685 * MUTEX: Interpreter is locked
687 ******************************************************************************/
689 void
690 acpi_ds_terminate_control_method(union acpi_operand_object *method_desc,
691 struct acpi_walk_state *walk_state)
694 ACPI_FUNCTION_TRACE_PTR(ds_terminate_control_method, walk_state);
696 /* method_desc is required, walk_state is optional */
698 if (!method_desc) {
699 return_VOID;
702 if (walk_state) {
704 /* Delete all arguments and locals */
706 acpi_ds_method_data_delete_all(walk_state);
709 * If method is serialized, release the mutex and restore the
710 * current sync level for this thread
712 if (method_desc->method.mutex) {
714 /* Acquisition Depth handles recursive calls */
716 method_desc->method.mutex->mutex.acquisition_depth--;
717 if (!method_desc->method.mutex->mutex.acquisition_depth) {
718 walk_state->thread->current_sync_level =
719 method_desc->method.mutex->mutex.
720 original_sync_level;
722 acpi_os_release_mutex(method_desc->method.
723 mutex->mutex.os_mutex);
724 method_desc->method.mutex->mutex.thread_id = 0;
729 * Delete any namespace objects created anywhere within the
730 * namespace by the execution of this method. Unless:
731 * 1) This method is a module-level executable code method, in which
732 * case we want make the objects permanent.
733 * 2) There are other threads executing the method, in which case we
734 * will wait until the last thread has completed.
736 if (!(method_desc->method.info_flags & ACPI_METHOD_MODULE_LEVEL)
737 && (method_desc->method.thread_count == 1)) {
739 /* Delete any direct children of (created by) this method */
741 acpi_ns_delete_namespace_subtree(walk_state->
742 method_node);
745 * Delete any objects that were created by this method
746 * elsewhere in the namespace (if any were created).
747 * Use of the ACPI_METHOD_MODIFIED_NAMESPACE optimizes the
748 * deletion such that we don't have to perform an entire
749 * namespace walk for every control method execution.
751 if (method_desc->method.
752 info_flags & ACPI_METHOD_MODIFIED_NAMESPACE) {
753 acpi_ns_delete_namespace_by_owner(method_desc->
754 method.
755 owner_id);
756 method_desc->method.info_flags &=
757 ~ACPI_METHOD_MODIFIED_NAMESPACE;
762 /* Decrement the thread count on the method */
764 if (method_desc->method.thread_count) {
765 method_desc->method.thread_count--;
766 } else {
767 ACPI_ERROR((AE_INFO, "Invalid zero thread count in method"));
770 /* Are there any other threads currently executing this method? */
772 if (method_desc->method.thread_count) {
774 * Additional threads. Do not release the owner_id in this case,
775 * we immediately reuse it for the next thread executing this method
777 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
778 "*** Completed execution of one thread, %u threads remaining\n",
779 method_desc->method.thread_count));
780 } else {
781 /* This is the only executing thread for this method */
784 * Support to dynamically change a method from not_serialized to
785 * Serialized if it appears that the method is incorrectly written and
786 * does not support multiple thread execution. The best example of this
787 * is if such a method creates namespace objects and blocks. A second
788 * thread will fail with an AE_ALREADY_EXISTS exception.
790 * This code is here because we must wait until the last thread exits
791 * before marking the method as serialized.
793 if (method_desc->method.
794 info_flags & ACPI_METHOD_SERIALIZED_PENDING) {
795 if (walk_state) {
796 ACPI_INFO((AE_INFO,
797 "Marking method %4.4s as Serialized because of AE_ALREADY_EXISTS error",
798 walk_state->method_node->name.
799 ascii));
803 * Method tried to create an object twice and was marked as
804 * "pending serialized". The probable cause is that the method
805 * cannot handle reentrancy.
807 * The method was created as not_serialized, but it tried to create
808 * a named object and then blocked, causing the second thread
809 * entrance to begin and then fail. Workaround this problem by
810 * marking the method permanently as Serialized when the last
811 * thread exits here.
813 method_desc->method.info_flags &=
814 ~ACPI_METHOD_SERIALIZED_PENDING;
815 method_desc->method.info_flags |=
816 (ACPI_METHOD_SERIALIZED |
817 ACPI_METHOD_IGNORE_SYNC_LEVEL);
818 method_desc->method.sync_level = 0;
821 /* No more threads, we can free the owner_id */
823 if (!
824 (method_desc->method.
825 info_flags & ACPI_METHOD_MODULE_LEVEL)) {
826 acpi_ut_release_owner_id(&method_desc->method.owner_id);
830 return_VOID;