1 /******************************************************************************
3 * Module Name: dsmethod - Parser/Interpreter interface - control method parsing
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2016, Intel Corp.
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12 * modification, are permitted provided that the following conditions
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15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
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20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
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54 #define _COMPONENT ACPI_DISPATCHER
55 ACPI_MODULE_NAME ("dsmethod")
57 /* Local prototypes */
60 AcpiDsDetectNamedOpcodes (
61 ACPI_WALK_STATE
*WalkState
,
62 ACPI_PARSE_OBJECT
**OutOp
);
65 AcpiDsCreateMethodMutex (
66 ACPI_OPERAND_OBJECT
*MethodDesc
);
69 /*******************************************************************************
71 * FUNCTION: AcpiDsAutoSerializeMethod
73 * PARAMETERS: Node - Namespace Node of the method
74 * ObjDesc - Method object attached to node
78 * DESCRIPTION: Parse a control method AML to scan for control methods that
79 * need serialization due to the creation of named objects.
81 * NOTE: It is a bit of overkill to mark all such methods serialized, since
82 * there is only a problem if the method actually blocks during execution.
83 * A blocking operation is, for example, a Sleep() operation, or any access
84 * to an operation region. However, it is probably not possible to easily
85 * detect whether a method will block or not, so we simply mark all suspicious
86 * methods as serialized.
88 * NOTE2: This code is essentially a generic routine for parsing a single
91 ******************************************************************************/
94 AcpiDsAutoSerializeMethod (
95 ACPI_NAMESPACE_NODE
*Node
,
96 ACPI_OPERAND_OBJECT
*ObjDesc
)
99 ACPI_PARSE_OBJECT
*Op
= NULL
;
100 ACPI_WALK_STATE
*WalkState
;
103 ACPI_FUNCTION_TRACE_PTR (DsAutoSerializeMethod
, Node
);
106 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE
,
107 "Method auto-serialization parse [%4.4s] %p\n",
108 AcpiUtGetNodeName (Node
), Node
));
110 /* Create/Init a root op for the method parse tree */
112 Op
= AcpiPsAllocOp (AML_METHOD_OP
, ObjDesc
->Method
.AmlStart
);
115 return_ACPI_STATUS (AE_NO_MEMORY
);
118 AcpiPsSetName (Op
, Node
->Name
.Integer
);
119 Op
->Common
.Node
= Node
;
121 /* Create and initialize a new walk state */
123 WalkState
= AcpiDsCreateWalkState (Node
->OwnerId
, NULL
, NULL
, NULL
);
127 return_ACPI_STATUS (AE_NO_MEMORY
);
130 Status
= AcpiDsInitAmlWalk (WalkState
, Op
, Node
,
131 ObjDesc
->Method
.AmlStart
, ObjDesc
->Method
.AmlLength
, NULL
, 0);
132 if (ACPI_FAILURE (Status
))
134 AcpiDsDeleteWalkState (WalkState
);
136 return_ACPI_STATUS (Status
);
139 WalkState
->DescendingCallback
= AcpiDsDetectNamedOpcodes
;
141 /* Parse the method, scan for creation of named objects */
143 Status
= AcpiPsParseAml (WalkState
);
145 AcpiPsDeleteParseTree (Op
);
146 return_ACPI_STATUS (Status
);
150 /*******************************************************************************
152 * FUNCTION: AcpiDsDetectNamedOpcodes
154 * PARAMETERS: WalkState - Current state of the parse tree walk
155 * OutOp - Unused, required for parser interface
159 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
160 * Currently used to detect methods that must be marked serialized
161 * in order to avoid problems with the creation of named objects.
163 ******************************************************************************/
166 AcpiDsDetectNamedOpcodes (
167 ACPI_WALK_STATE
*WalkState
,
168 ACPI_PARSE_OBJECT
**OutOp
)
171 ACPI_FUNCTION_NAME (AcpiDsDetectNamedOpcodes
);
174 /* We are only interested in opcodes that create a new name */
176 if (!(WalkState
->OpInfo
->Flags
& (AML_NAMED
| AML_CREATE
| AML_FIELD
)))
182 * At this point, we know we have a Named object opcode.
183 * Mark the method as serialized. Later code will create a mutex for
184 * this method to enforce serialization.
186 * Note, ACPI_METHOD_IGNORE_SYNC_LEVEL flag means that we will ignore the
187 * Sync Level mechanism for this method, even though it is now serialized.
188 * Otherwise, there can be conflicts with existing ASL code that actually
191 WalkState
->MethodDesc
->Method
.SyncLevel
= 0;
192 WalkState
->MethodDesc
->Method
.InfoFlags
|=
193 (ACPI_METHOD_SERIALIZED
| ACPI_METHOD_IGNORE_SYNC_LEVEL
);
195 ACPI_DEBUG_PRINT ((ACPI_DB_INFO
,
196 "Method serialized [%4.4s] %p - [%s] (%4.4X)\n",
197 WalkState
->MethodNode
->Name
.Ascii
, WalkState
->MethodNode
,
198 WalkState
->OpInfo
->Name
, WalkState
->Opcode
));
200 /* Abort the parse, no need to examine this method any further */
202 return (AE_CTRL_TERMINATE
);
206 /*******************************************************************************
208 * FUNCTION: AcpiDsMethodError
210 * PARAMETERS: Status - Execution status
211 * WalkState - Current state
215 * DESCRIPTION: Called on method error. Invoke the global exception handler if
216 * present, dump the method data if the debugger is configured
218 * Note: Allows the exception handler to change the status code
220 ******************************************************************************/
225 ACPI_WALK_STATE
*WalkState
)
230 ACPI_FUNCTION_ENTRY ();
233 /* Ignore AE_OK and control exception codes */
235 if (ACPI_SUCCESS (Status
) ||
236 (Status
& AE_CODE_CONTROL
))
241 /* Invoke the global exception handler */
243 if (AcpiGbl_ExceptionHandler
)
245 /* Exit the interpreter, allow handler to execute methods */
247 AcpiExExitInterpreter ();
250 * Handler can map the exception code to anything it wants, including
251 * AE_OK, in which case the executing method will not be aborted.
253 AmlOffset
= (UINT32
) ACPI_PTR_DIFF (WalkState
->Aml
,
254 WalkState
->ParserState
.AmlStart
);
256 Status
= AcpiGbl_ExceptionHandler (Status
,
257 WalkState
->MethodNode
?
258 WalkState
->MethodNode
->Name
.Integer
: 0,
259 WalkState
->Opcode
, AmlOffset
, NULL
);
260 AcpiExEnterInterpreter ();
263 AcpiDsClearImplicitReturn (WalkState
);
265 if (ACPI_FAILURE (Status
))
267 AcpiDsDumpMethodStack (Status
, WalkState
, WalkState
->Op
);
269 /* Display method locals/args if debugger is present */
272 AcpiDbDumpMethodInfo (Status
, WalkState
);
280 /*******************************************************************************
282 * FUNCTION: AcpiDsCreateMethodMutex
284 * PARAMETERS: ObjDesc - The method object
288 * DESCRIPTION: Create a mutex object for a serialized control method
290 ******************************************************************************/
293 AcpiDsCreateMethodMutex (
294 ACPI_OPERAND_OBJECT
*MethodDesc
)
296 ACPI_OPERAND_OBJECT
*MutexDesc
;
300 ACPI_FUNCTION_TRACE (DsCreateMethodMutex
);
303 /* Create the new mutex object */
305 MutexDesc
= AcpiUtCreateInternalObject (ACPI_TYPE_MUTEX
);
308 return_ACPI_STATUS (AE_NO_MEMORY
);
311 /* Create the actual OS Mutex */
313 Status
= AcpiOsCreateMutex (&MutexDesc
->Mutex
.OsMutex
);
314 if (ACPI_FAILURE (Status
))
316 AcpiUtDeleteObjectDesc (MutexDesc
);
317 return_ACPI_STATUS (Status
);
320 MutexDesc
->Mutex
.SyncLevel
= MethodDesc
->Method
.SyncLevel
;
321 MethodDesc
->Method
.Mutex
= MutexDesc
;
322 return_ACPI_STATUS (AE_OK
);
326 /*******************************************************************************
328 * FUNCTION: AcpiDsBeginMethodExecution
330 * PARAMETERS: MethodNode - Node of the method
331 * ObjDesc - The method object
332 * WalkState - current state, NULL if not yet executing
337 * DESCRIPTION: Prepare a method for execution. Parses the method if necessary,
338 * increments the thread count, and waits at the method semaphore
339 * for clearance to execute.
341 ******************************************************************************/
344 AcpiDsBeginMethodExecution (
345 ACPI_NAMESPACE_NODE
*MethodNode
,
346 ACPI_OPERAND_OBJECT
*ObjDesc
,
347 ACPI_WALK_STATE
*WalkState
)
349 ACPI_STATUS Status
= AE_OK
;
352 ACPI_FUNCTION_TRACE_PTR (DsBeginMethodExecution
, MethodNode
);
357 return_ACPI_STATUS (AE_NULL_ENTRY
);
360 AcpiExStartTraceMethod (MethodNode
, ObjDesc
, WalkState
);
362 /* Prevent wraparound of thread count */
364 if (ObjDesc
->Method
.ThreadCount
== ACPI_UINT8_MAX
)
366 ACPI_ERROR ((AE_INFO
,
367 "Method reached maximum reentrancy limit (255)"));
368 return_ACPI_STATUS (AE_AML_METHOD_LIMIT
);
372 * If this method is serialized, we need to acquire the method mutex.
374 if (ObjDesc
->Method
.InfoFlags
& ACPI_METHOD_SERIALIZED
)
377 * Create a mutex for the method if it is defined to be Serialized
378 * and a mutex has not already been created. We defer the mutex creation
379 * until a method is actually executed, to minimize the object count
381 if (!ObjDesc
->Method
.Mutex
)
383 Status
= AcpiDsCreateMethodMutex (ObjDesc
);
384 if (ACPI_FAILURE (Status
))
386 return_ACPI_STATUS (Status
);
391 * The CurrentSyncLevel (per-thread) must be less than or equal to
392 * the sync level of the method. This mechanism provides some
393 * deadlock prevention.
395 * If the method was auto-serialized, we just ignore the sync level
396 * mechanism, because auto-serialization of methods can interfere
397 * with ASL code that actually uses sync levels.
399 * Top-level method invocation has no walk state at this point
402 (!(ObjDesc
->Method
.InfoFlags
& ACPI_METHOD_IGNORE_SYNC_LEVEL
)) &&
403 (WalkState
->Thread
->CurrentSyncLevel
>
404 ObjDesc
->Method
.Mutex
->Mutex
.SyncLevel
))
406 ACPI_ERROR ((AE_INFO
,
407 "Cannot acquire Mutex for method [%4.4s]"
408 ", current SyncLevel is too large (%u)",
409 AcpiUtGetNodeName (MethodNode
),
410 WalkState
->Thread
->CurrentSyncLevel
));
412 return_ACPI_STATUS (AE_AML_MUTEX_ORDER
);
416 * Obtain the method mutex if necessary. Do not acquire mutex for a
420 !ObjDesc
->Method
.Mutex
->Mutex
.ThreadId
||
421 (WalkState
->Thread
->ThreadId
!=
422 ObjDesc
->Method
.Mutex
->Mutex
.ThreadId
))
425 * Acquire the method mutex. This releases the interpreter if we
426 * block (and reacquires it before it returns)
428 Status
= AcpiExSystemWaitMutex (
429 ObjDesc
->Method
.Mutex
->Mutex
.OsMutex
, ACPI_WAIT_FOREVER
);
430 if (ACPI_FAILURE (Status
))
432 return_ACPI_STATUS (Status
);
435 /* Update the mutex and walk info and save the original SyncLevel */
439 ObjDesc
->Method
.Mutex
->Mutex
.OriginalSyncLevel
=
440 WalkState
->Thread
->CurrentSyncLevel
;
442 ObjDesc
->Method
.Mutex
->Mutex
.ThreadId
=
443 WalkState
->Thread
->ThreadId
;
446 * Update the current SyncLevel only if this is not an auto-
447 * serialized method. In the auto case, we have to ignore
448 * the sync level for the method mutex (created for the
449 * auto-serialization) because we have no idea of what the
450 * sync level should be. Therefore, just ignore it.
452 if (!(ObjDesc
->Method
.InfoFlags
&
453 ACPI_METHOD_IGNORE_SYNC_LEVEL
))
455 WalkState
->Thread
->CurrentSyncLevel
=
456 ObjDesc
->Method
.SyncLevel
;
461 ObjDesc
->Method
.Mutex
->Mutex
.OriginalSyncLevel
=
462 ObjDesc
->Method
.Mutex
->Mutex
.SyncLevel
;
464 ObjDesc
->Method
.Mutex
->Mutex
.ThreadId
=
465 AcpiOsGetThreadId ();
469 /* Always increase acquisition depth */
471 ObjDesc
->Method
.Mutex
->Mutex
.AcquisitionDepth
++;
475 * Allocate an Owner ID for this method, only if this is the first thread
476 * to begin concurrent execution. We only need one OwnerId, even if the
477 * method is invoked recursively.
479 if (!ObjDesc
->Method
.OwnerId
)
481 Status
= AcpiUtAllocateOwnerId (&ObjDesc
->Method
.OwnerId
);
482 if (ACPI_FAILURE (Status
))
489 * Increment the method parse tree thread count since it has been
490 * reentered one more time (even if it is the same thread)
492 ObjDesc
->Method
.ThreadCount
++;
494 return_ACPI_STATUS (Status
);
498 /* On error, must release the method mutex (if present) */
500 if (ObjDesc
->Method
.Mutex
)
502 AcpiOsReleaseMutex (ObjDesc
->Method
.Mutex
->Mutex
.OsMutex
);
504 return_ACPI_STATUS (Status
);
508 /*******************************************************************************
510 * FUNCTION: AcpiDsCallControlMethod
512 * PARAMETERS: Thread - Info for this thread
513 * ThisWalkState - Current walk state
514 * Op - Current Op to be walked
518 * DESCRIPTION: Transfer execution to a called control method
520 ******************************************************************************/
523 AcpiDsCallControlMethod (
524 ACPI_THREAD_STATE
*Thread
,
525 ACPI_WALK_STATE
*ThisWalkState
,
526 ACPI_PARSE_OBJECT
*Op
)
529 ACPI_NAMESPACE_NODE
*MethodNode
;
530 ACPI_WALK_STATE
*NextWalkState
= NULL
;
531 ACPI_OPERAND_OBJECT
*ObjDesc
;
532 ACPI_EVALUATE_INFO
*Info
;
536 ACPI_FUNCTION_TRACE_PTR (DsCallControlMethod
, ThisWalkState
);
538 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
539 "Calling method %p, currentstate=%p\n",
540 ThisWalkState
->PrevOp
, ThisWalkState
));
543 * Get the namespace entry for the control method we are about to call
545 MethodNode
= ThisWalkState
->MethodCallNode
;
548 return_ACPI_STATUS (AE_NULL_ENTRY
);
551 ObjDesc
= AcpiNsGetAttachedObject (MethodNode
);
554 return_ACPI_STATUS (AE_NULL_OBJECT
);
557 /* Init for new method, possibly wait on method mutex */
559 Status
= AcpiDsBeginMethodExecution (
560 MethodNode
, ObjDesc
, ThisWalkState
);
561 if (ACPI_FAILURE (Status
))
563 return_ACPI_STATUS (Status
);
566 /* Begin method parse/execution. Create a new walk state */
568 NextWalkState
= AcpiDsCreateWalkState (
569 ObjDesc
->Method
.OwnerId
, NULL
, ObjDesc
, Thread
);
572 Status
= AE_NO_MEMORY
;
577 * The resolved arguments were put on the previous walk state's operand
578 * stack. Operands on the previous walk state stack always
579 * start at index 0. Also, null terminate the list of arguments
581 ThisWalkState
->Operands
[ThisWalkState
->NumOperands
] = NULL
;
584 * Allocate and initialize the evaluation information block
585 * TBD: this is somewhat inefficient, should change interface to
586 * DsInitAmlWalk. For now, keeps this struct off the CPU stack
588 Info
= ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO
));
591 Status
= AE_NO_MEMORY
;
595 Info
->Parameters
= &ThisWalkState
->Operands
[0];
597 Status
= AcpiDsInitAmlWalk (NextWalkState
, NULL
, MethodNode
,
598 ObjDesc
->Method
.AmlStart
, ObjDesc
->Method
.AmlLength
,
599 Info
, ACPI_IMODE_EXECUTE
);
602 if (ACPI_FAILURE (Status
))
608 * Delete the operands on the previous walkstate operand stack
609 * (they were copied to new objects)
611 for (i
= 0; i
< ObjDesc
->Method
.ParamCount
; i
++)
613 AcpiUtRemoveReference (ThisWalkState
->Operands
[i
]);
614 ThisWalkState
->Operands
[i
] = NULL
;
617 /* Clear the operand stack */
619 ThisWalkState
->NumOperands
= 0;
621 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
622 "**** Begin nested execution of [%4.4s] **** WalkState=%p\n",
623 MethodNode
->Name
.Ascii
, NextWalkState
));
625 /* Invoke an internal method if necessary */
627 if (ObjDesc
->Method
.InfoFlags
& ACPI_METHOD_INTERNAL_ONLY
)
629 Status
= ObjDesc
->Method
.Dispatch
.Implementation (NextWalkState
);
632 Status
= AE_CTRL_TERMINATE
;
636 return_ACPI_STATUS (Status
);
641 /* On error, we must terminate the method properly */
643 AcpiDsTerminateControlMethod (ObjDesc
, NextWalkState
);
644 AcpiDsDeleteWalkState (NextWalkState
);
646 return_ACPI_STATUS (Status
);
650 /*******************************************************************************
652 * FUNCTION: AcpiDsRestartControlMethod
654 * PARAMETERS: WalkState - State for preempted method (caller)
655 * ReturnDesc - Return value from the called method
659 * DESCRIPTION: Restart a method that was preempted by another (nested) method
660 * invocation. Handle the return value (if any) from the callee.
662 ******************************************************************************/
665 AcpiDsRestartControlMethod (
666 ACPI_WALK_STATE
*WalkState
,
667 ACPI_OPERAND_OBJECT
*ReturnDesc
)
670 int SameAsImplicitReturn
;
673 ACPI_FUNCTION_TRACE_PTR (DsRestartControlMethod
, WalkState
);
676 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
677 "****Restart [%4.4s] Op %p ReturnValueFromCallee %p\n",
678 AcpiUtGetNodeName (WalkState
->MethodNode
),
679 WalkState
->MethodCallOp
, ReturnDesc
));
681 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
682 " ReturnFromThisMethodUsed?=%X ResStack %p Walk %p\n",
683 WalkState
->ReturnUsed
,
684 WalkState
->Results
, WalkState
));
686 /* Did the called method return a value? */
690 /* Is the implicit return object the same as the return desc? */
692 SameAsImplicitReturn
= (WalkState
->ImplicitReturnObj
== ReturnDesc
);
694 /* Are we actually going to use the return value? */
696 if (WalkState
->ReturnUsed
)
698 /* Save the return value from the previous method */
700 Status
= AcpiDsResultPush (ReturnDesc
, WalkState
);
701 if (ACPI_FAILURE (Status
))
703 AcpiUtRemoveReference (ReturnDesc
);
704 return_ACPI_STATUS (Status
);
708 * Save as THIS method's return value in case it is returned
709 * immediately to yet another method
711 WalkState
->ReturnDesc
= ReturnDesc
;
715 * The following code is the optional support for the so-called
716 * "implicit return". Some AML code assumes that the last value of the
717 * method is "implicitly" returned to the caller, in the absence of an
718 * explicit return value.
720 * Just save the last result of the method as the return value.
722 * NOTE: this is optional because the ASL language does not actually
723 * support this behavior.
725 else if (!AcpiDsDoImplicitReturn (ReturnDesc
, WalkState
, FALSE
) ||
726 SameAsImplicitReturn
)
729 * Delete the return value if it will not be used by the
730 * calling method or remove one reference if the explicit return
731 * is the same as the implicit return value.
733 AcpiUtRemoveReference (ReturnDesc
);
737 return_ACPI_STATUS (AE_OK
);
741 /*******************************************************************************
743 * FUNCTION: AcpiDsTerminateControlMethod
745 * PARAMETERS: MethodDesc - Method object
746 * WalkState - State associated with the method
750 * DESCRIPTION: Terminate a control method. Delete everything that the method
751 * created, delete all locals and arguments, and delete the parse
754 * MUTEX: Interpreter is locked
756 ******************************************************************************/
759 AcpiDsTerminateControlMethod (
760 ACPI_OPERAND_OBJECT
*MethodDesc
,
761 ACPI_WALK_STATE
*WalkState
)
764 ACPI_FUNCTION_TRACE_PTR (DsTerminateControlMethod
, WalkState
);
767 /* MethodDesc is required, WalkState is optional */
776 /* Delete all arguments and locals */
778 AcpiDsMethodDataDeleteAll (WalkState
);
781 * Delete any namespace objects created anywhere within the
782 * namespace by the execution of this method. Unless:
783 * 1) This method is a module-level executable code method, in which
784 * case we want make the objects permanent.
785 * 2) There are other threads executing the method, in which case we
786 * will wait until the last thread has completed.
788 if (!(MethodDesc
->Method
.InfoFlags
& ACPI_METHOD_MODULE_LEVEL
) &&
789 (MethodDesc
->Method
.ThreadCount
== 1))
791 /* Delete any direct children of (created by) this method */
793 (void) AcpiExExitInterpreter ();
794 AcpiNsDeleteNamespaceSubtree (WalkState
->MethodNode
);
795 (void) AcpiExEnterInterpreter ();
798 * Delete any objects that were created by this method
799 * elsewhere in the namespace (if any were created).
800 * Use of the ACPI_METHOD_MODIFIED_NAMESPACE optimizes the
801 * deletion such that we don't have to perform an entire
802 * namespace walk for every control method execution.
804 if (MethodDesc
->Method
.InfoFlags
& ACPI_METHOD_MODIFIED_NAMESPACE
)
806 (void) AcpiExExitInterpreter ();
807 AcpiNsDeleteNamespaceByOwner (MethodDesc
->Method
.OwnerId
);
808 (void) AcpiExEnterInterpreter ();
809 MethodDesc
->Method
.InfoFlags
&=
810 ~ACPI_METHOD_MODIFIED_NAMESPACE
;
815 * If method is serialized, release the mutex and restore the
816 * current sync level for this thread
818 if (MethodDesc
->Method
.Mutex
)
820 /* Acquisition Depth handles recursive calls */
822 MethodDesc
->Method
.Mutex
->Mutex
.AcquisitionDepth
--;
823 if (!MethodDesc
->Method
.Mutex
->Mutex
.AcquisitionDepth
)
825 WalkState
->Thread
->CurrentSyncLevel
=
826 MethodDesc
->Method
.Mutex
->Mutex
.OriginalSyncLevel
;
829 MethodDesc
->Method
.Mutex
->Mutex
.OsMutex
);
830 MethodDesc
->Method
.Mutex
->Mutex
.ThreadId
= 0;
835 /* Decrement the thread count on the method */
837 if (MethodDesc
->Method
.ThreadCount
)
839 MethodDesc
->Method
.ThreadCount
--;
843 ACPI_ERROR ((AE_INFO
,
844 "Invalid zero thread count in method"));
847 /* Are there any other threads currently executing this method? */
849 if (MethodDesc
->Method
.ThreadCount
)
852 * Additional threads. Do not release the OwnerId in this case,
853 * we immediately reuse it for the next thread executing this method
855 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
856 "*** Completed execution of one thread, %u threads remaining\n",
857 MethodDesc
->Method
.ThreadCount
));
861 /* This is the only executing thread for this method */
864 * Support to dynamically change a method from NotSerialized to
865 * Serialized if it appears that the method is incorrectly written and
866 * does not support multiple thread execution. The best example of this
867 * is if such a method creates namespace objects and blocks. A second
868 * thread will fail with an AE_ALREADY_EXISTS exception.
870 * This code is here because we must wait until the last thread exits
871 * before marking the method as serialized.
873 if (MethodDesc
->Method
.InfoFlags
& ACPI_METHOD_SERIALIZED_PENDING
)
878 "Marking method %4.4s as Serialized "
879 "because of AE_ALREADY_EXISTS error",
880 WalkState
->MethodNode
->Name
.Ascii
));
884 * Method tried to create an object twice and was marked as
885 * "pending serialized". The probable cause is that the method
886 * cannot handle reentrancy.
888 * The method was created as NotSerialized, but it tried to create
889 * a named object and then blocked, causing the second thread
890 * entrance to begin and then fail. Workaround this problem by
891 * marking the method permanently as Serialized when the last
894 MethodDesc
->Method
.InfoFlags
&=
895 ~ACPI_METHOD_SERIALIZED_PENDING
;
897 MethodDesc
->Method
.InfoFlags
|=
898 (ACPI_METHOD_SERIALIZED
| ACPI_METHOD_IGNORE_SYNC_LEVEL
);
899 MethodDesc
->Method
.SyncLevel
= 0;
902 /* No more threads, we can free the OwnerId */
904 if (!(MethodDesc
->Method
.InfoFlags
& ACPI_METHOD_MODULE_LEVEL
))
906 AcpiUtReleaseOwnerId (&MethodDesc
->Method
.OwnerId
);
910 AcpiExStopTraceMethod ((ACPI_NAMESPACE_NODE
*) MethodDesc
->Method
.Node
,
911 MethodDesc
, WalkState
);