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 /******************************************************************************
  *
  * Module Name: dsmethod - Parser/Interpreter interface - control method parsing
  *
  *****************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
  * All rights reserved.
  *
  * 2. License
  *
  * 2.1. This is your license from Intel Corp. under its intellectual property
  * rights.  You may have additional license terms from the party that provided
  * you this software, covering your right to use that party's intellectual
  * property rights.
  *
  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  * copy of the source code appearing in this file ("Covered Code") an
  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  * base code distributed originally by Intel ("Original Intel Code") to copy,
  * make derivatives, distribute, use and display any portion of the Covered
  * Code in any form, with the right to sublicense such rights; and
  *
  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  * license (with the right to sublicense), under only those claims of Intel
  * patents that are infringed by the Original Intel Code, to make, use, sell,
  * offer to sell, and import the Covered Code and derivative works thereof
  * solely to the minimum extent necessary to exercise the above copyright
  * license, and in no event shall the patent license extend to any additions
  * to or modifications of the Original Intel Code.  No other license or right
  * is granted directly or by implication, estoppel or otherwise;
  *
  * The above copyright and patent license is granted only if the following
  * conditions are met:
  *
  * 3. Conditions
  *
  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification with rights to further distribute source must include
  * the above Copyright Notice, the above License, this list of Conditions,
  * and the following Disclaimer and Export Compliance provision.  In addition,
  * Licensee must cause all Covered Code to which Licensee contributes to
  * contain a file documenting the changes Licensee made to create that Covered
  * Code and the date of any change.  Licensee must include in that file the
  * documentation of any changes made by any predecessor Licensee.  Licensee
  * must include a prominent statement that the modification is derived,
  * directly or indirectly, from Original Intel Code.
  *
  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification without rights to further distribute source must
  * include the following Disclaimer and Export Compliance provision in the
  * documentation and/or other materials provided with distribution.  In
  * addition, Licensee may not authorize further sublicense of source of any
  * portion of the Covered Code, and must include terms to the effect that the
  * license from Licensee to its licensee is limited to the intellectual
  * property embodied in the software Licensee provides to its licensee, and
  * not to intellectual property embodied in modifications its licensee may
  * make.
  *
  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  * substantial portion of the Covered Code or modification must reproduce the
  * above Copyright Notice, and the following Disclaimer and Export Compliance
  * provision in the documentation and/or other materials provided with the
  * distribution.
  *
  * 3.4. Intel retains all right, title, and interest in and to the Original
  * Intel Code.
  *
  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  * Intel shall be used in advertising or otherwise to promote the sale, use or
  * other dealings in products derived from or relating to the Covered Code
  * without prior written authorization from Intel.
  *
  * 4. Disclaimer and Export Compliance
  *
  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  * PARTICULAR PURPOSE.
  *
  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  * LIMITED REMEDY.
  *
  * 4.3. Licensee shall not export, either directly or indirectly, any of this
  * software or system incorporating such software without first obtaining any
  * required license or other approval from the U. S. Department of Commerce or
  * any other agency or department of the United States Government.  In the
  * event Licensee exports any such software from the United States or
  * re-exports any such software from a foreign destination, Licensee shall
  * ensure that the distribution and export/re-export of the software is in
  * compliance with all laws, regulations, orders, or other restrictions of the
  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
  * any of its subsidiaries will export/re-export any technical data, process,
  * software, or service, directly or indirectly, to any country for which the
  * United States government or any agency thereof requires an export license,
  * other governmental approval, or letter of assurance, without first obtaining
  * such license, approval or letter.
  *
  *****************************************************************************/
 
 #define __DSMETHOD_C__
 
 #include "acpi.h"
 #include "accommon.h"
 #include "amlcode.h"
 #include "acdispat.h"
 #include "acinterp.h"
 #include "acnamesp.h"
 #include "acdisasm.h"
 
 
 #define _COMPONENT          ACPI_DISPATCHER
         ACPI_MODULE_NAME    ("dsmethod")
 
 /* Local prototypes */
 
 static ACPI_STATUS
 AcpiDsCreateMethodMutex (
     ACPI_OPERAND_OBJECT     *MethodDesc);
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsMethodError
  *
  * PARAMETERS:  Status          - Execution status
  *              WalkState       - Current state
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Called on method error. Invoke the global exception handler if
  *              present, dump the method data if the disassembler is configured
  *
  *              Note: Allows the exception handler to change the status code
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiDsMethodError (
     ACPI_STATUS             Status,
     ACPI_WALK_STATE         *WalkState)
 {
     ACPI_FUNCTION_ENTRY ();
 
 
     /* Ignore AE_OK and control exception codes */
 
     if (ACPI_SUCCESS (Status) ||
         (Status & AE_CODE_CONTROL))
     {
         return (Status);
     }
 
     /* Invoke the global exception handler */
 
     if (AcpiGbl_ExceptionHandler)
     {
         /* Exit the interpreter, allow handler to execute methods */
 
         AcpiExExitInterpreter ();
 
         /*
          * Handler can map the exception code to anything it wants, including
          * AE_OK, in which case the executing method will not be aborted.
          */
         Status = AcpiGbl_ExceptionHandler (Status,
                     WalkState->MethodNode ?
                         WalkState->MethodNode->Name.Integer : 0,
                     WalkState->Opcode, WalkState->AmlOffset, NULL);
         AcpiExEnterInterpreter ();
     }
 
     AcpiDsClearImplicitReturn (WalkState);
 
 #ifdef ACPI_DISASSEMBLER
     if (ACPI_FAILURE (Status))
     {
         /* Display method locals/args if disassembler is present */
 
         AcpiDmDumpMethodInfo (Status, WalkState, WalkState->Op);
     }
 #endif
 
     return (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsCreateMethodMutex
  *
  * PARAMETERS:  ObjDesc             - The method object
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Create a mutex object for a serialized control method
  *
  ******************************************************************************/
 
 static ACPI_STATUS
 AcpiDsCreateMethodMutex (
     ACPI_OPERAND_OBJECT     *MethodDesc)
 {
     ACPI_OPERAND_OBJECT     *MutexDesc;
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE (DsCreateMethodMutex);
 
 
     /* Create the new mutex object */
 
     MutexDesc = AcpiUtCreateInternalObject (ACPI_TYPE_MUTEX);
     if (!MutexDesc)
     {
         return_ACPI_STATUS (AE_NO_MEMORY);
     }
 
     /* Create the actual OS Mutex */
 
     Status = AcpiOsCreateMutex (&MutexDesc->Mutex.OsMutex);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     MutexDesc->Mutex.SyncLevel = MethodDesc->Method.SyncLevel;
     MethodDesc->Method.Mutex = MutexDesc;
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsBeginMethodExecution
  *
  * PARAMETERS:  MethodNode          - Node of the method
  *              ObjDesc             - The method object
  *              WalkState           - current state, NULL if not yet executing
  *                                    a method.
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Prepare a method for execution.  Parses the method if necessary,
  *              increments the thread count, and waits at the method semaphore
  *              for clearance to execute.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiDsBeginMethodExecution (
     ACPI_NAMESPACE_NODE     *MethodNode,
     ACPI_OPERAND_OBJECT     *ObjDesc,
     ACPI_WALK_STATE         *WalkState)
 {
     ACPI_STATUS             Status = AE_OK;
 
 
     ACPI_FUNCTION_TRACE_PTR (DsBeginMethodExecution, MethodNode);
 
 
     if (!MethodNode)
     {
         return_ACPI_STATUS (AE_NULL_ENTRY);
     }
 
     /* Prevent wraparound of thread count */
 
     if (ObjDesc->Method.ThreadCount == ACPI_UINT8_MAX)
     {
         ACPI_ERROR ((AE_INFO,
             "Method reached maximum reentrancy limit (255)"));
         return_ACPI_STATUS (AE_AML_METHOD_LIMIT);
     }
 
     /*
      * If this method is serialized, we need to acquire the method mutex.
      */
     if (ObjDesc->Method.MethodFlags & AML_METHOD_SERIALIZED)
     {
         /*
          * Create a mutex for the method if it is defined to be Serialized
          * and a mutex has not already been created. We defer the mutex creation
          * until a method is actually executed, to minimize the object count
          */
         if (!ObjDesc->Method.Mutex)
         {
             Status = AcpiDsCreateMethodMutex (ObjDesc);
             if (ACPI_FAILURE (Status))
             {
                 return_ACPI_STATUS (Status);
             }
         }
 
         /*
          * The CurrentSyncLevel (per-thread) must be less than or equal to
          * the sync level of the method. This mechanism provides some
          * deadlock prevention
          *
          * Top-level method invocation has no walk state at this point
          */
         if (WalkState &&
             (WalkState->Thread->CurrentSyncLevel > ObjDesc->Method.Mutex->Mutex.SyncLevel))
         {
             ACPI_ERROR ((AE_INFO,
                 "Cannot acquire Mutex for method [%4.4s], current SyncLevel is too large (%d)",
                 AcpiUtGetNodeName (MethodNode),
                 WalkState->Thread->CurrentSyncLevel));
 
             return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
         }
 
         /*
          * Obtain the method mutex if necessary. Do not acquire mutex for a
          * recursive call.
          */
         if (!WalkState ||
             !ObjDesc->Method.Mutex->Mutex.ThreadId ||
             (WalkState->Thread->ThreadId != ObjDesc->Method.Mutex->Mutex.ThreadId))
         {
             /*
              * Acquire the method mutex. This releases the interpreter if we
              * block (and reacquires it before it returns)
              */
             Status = AcpiExSystemWaitMutex (ObjDesc->Method.Mutex->Mutex.OsMutex,
                         ACPI_WAIT_FOREVER);
             if (ACPI_FAILURE (Status))
             {
                 return_ACPI_STATUS (Status);
             }
 
             /* Update the mutex and walk info and save the original SyncLevel */
 
             if (WalkState)
             {
                 ObjDesc->Method.Mutex->Mutex.OriginalSyncLevel =
                     WalkState->Thread->CurrentSyncLevel;
 
                 ObjDesc->Method.Mutex->Mutex.ThreadId = WalkState->Thread->ThreadId;
                 WalkState->Thread->CurrentSyncLevel = ObjDesc->Method.SyncLevel;
             }
             else
             {
                 ObjDesc->Method.Mutex->Mutex.OriginalSyncLevel =
                     ObjDesc->Method.Mutex->Mutex.SyncLevel;
             }
         }
 
         /* Always increase acquisition depth */
 
         ObjDesc->Method.Mutex->Mutex.AcquisitionDepth++;
     }
 
     /*
      * Allocate an Owner ID for this method, only if this is the first thread
      * to begin concurrent execution. We only need one OwnerId, even if the
      * method is invoked recursively.
      */
     if (!ObjDesc->Method.OwnerId)
     {
         Status = AcpiUtAllocateOwnerId (&ObjDesc->Method.OwnerId);
         if (ACPI_FAILURE (Status))
         {
             goto Cleanup;
         }
     }
 
     /*
      * Increment the method parse tree thread count since it has been
      * reentered one more time (even if it is the same thread)
      */
     ObjDesc->Method.ThreadCount++;
     AcpiMethodCount++;
     return_ACPI_STATUS (Status);
 
 
 Cleanup:
     /* On error, must release the method mutex (if present) */
 
     if (ObjDesc->Method.Mutex)
     {
         AcpiOsReleaseMutex (ObjDesc->Method.Mutex->Mutex.OsMutex);
     }
     return_ACPI_STATUS (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsCallControlMethod
  *
  * PARAMETERS:  Thread              - Info for this thread
  *              ThisWalkState       - Current walk state
  *              Op                  - Current Op to be walked
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Transfer execution to a called control method
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiDsCallControlMethod (
     ACPI_THREAD_STATE       *Thread,
     ACPI_WALK_STATE         *ThisWalkState,
     ACPI_PARSE_OBJECT       *Op)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *MethodNode;
     ACPI_WALK_STATE         *NextWalkState = NULL;
     ACPI_OPERAND_OBJECT     *ObjDesc;
     ACPI_EVALUATE_INFO      *Info;
     UINT32                  i;
 
 
     ACPI_FUNCTION_TRACE_PTR (DsCallControlMethod, ThisWalkState);
 
     ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Calling method %p, currentstate=%p\n",
         ThisWalkState->PrevOp, ThisWalkState));
 
     /*
      * Get the namespace entry for the control method we are about to call
      */
     MethodNode = ThisWalkState->MethodCallNode;
     if (!MethodNode)
     {
         return_ACPI_STATUS (AE_NULL_ENTRY);
     }
 
     ObjDesc = AcpiNsGetAttachedObject (MethodNode);
     if (!ObjDesc)
     {
         return_ACPI_STATUS (AE_NULL_OBJECT);
     }
 
     /* Init for new method, possibly wait on method mutex */
 
     Status = AcpiDsBeginMethodExecution (MethodNode, ObjDesc,
                 ThisWalkState);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     /* Begin method parse/execution. Create a new walk state */
 
     NextWalkState = AcpiDsCreateWalkState (ObjDesc->Method.OwnerId,
                         NULL, ObjDesc, Thread);
     if (!NextWalkState)
     {
         Status = AE_NO_MEMORY;
         goto Cleanup;
     }
 
     /*
      * The resolved arguments were put on the previous walk state's operand
      * stack. Operands on the previous walk state stack always
      * start at index 0. Also, null terminate the list of arguments
      */
     ThisWalkState->Operands [ThisWalkState->NumOperands] = NULL;
 
     /*
      * Allocate and initialize the evaluation information block
      * TBD: this is somewhat inefficient, should change interface to
      * DsInitAmlWalk. For now, keeps this struct off the CPU stack
      */
     Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
     if (!Info)
     {
         return_ACPI_STATUS (AE_NO_MEMORY);
     }
 
     Info->Parameters = &ThisWalkState->Operands[0];
 
     Status = AcpiDsInitAmlWalk (NextWalkState, NULL, MethodNode,
                 ObjDesc->Method.AmlStart, ObjDesc->Method.AmlLength,
                 Info, ACPI_IMODE_EXECUTE);
 
     ACPI_FREE (Info);
     if (ACPI_FAILURE (Status))
     {
         goto Cleanup;
     }
 
     /*
      * Delete the operands on the previous walkstate operand stack
      * (they were copied to new objects)
      */
     for (i = 0; i < ObjDesc->Method.ParamCount; i++)
     {
         AcpiUtRemoveReference (ThisWalkState->Operands [i]);
         ThisWalkState->Operands [i] = NULL;
     }
 
     /* Clear the operand stack */
 
     ThisWalkState->NumOperands = 0;
 
     ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
         "**** Begin nested execution of [%4.4s] **** WalkState=%p\n",
         MethodNode->Name.Ascii, NextWalkState));
 
     /* Invoke an internal method if necessary */
 
     if (ObjDesc->Method.MethodFlags & AML_METHOD_INTERNAL_ONLY)
     {
         Status = ObjDesc->Method.Implementation (NextWalkState);
         if (Status == AE_OK)
         {
             Status = AE_CTRL_TERMINATE;
         }
     }
 
     return_ACPI_STATUS (Status);
 
 
 Cleanup:
 
     /* On error, we must terminate the method properly */
 
     AcpiDsTerminateControlMethod (ObjDesc, NextWalkState);
     if (NextWalkState)
     {
         AcpiDsDeleteWalkState (NextWalkState);
     }
 
     return_ACPI_STATUS (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsRestartControlMethod
  *
  * PARAMETERS:  WalkState           - State for preempted method (caller)
  *              ReturnDesc          - Return value from the called method
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Restart a method that was preempted by another (nested) method
  *              invocation.  Handle the return value (if any) from the callee.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiDsRestartControlMethod (
     ACPI_WALK_STATE         *WalkState,
     ACPI_OPERAND_OBJECT     *ReturnDesc)
 {
     ACPI_STATUS             Status;
     int                     SameAsImplicitReturn;
 
 
     ACPI_FUNCTION_TRACE_PTR (DsRestartControlMethod, WalkState);
 
 
     ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
         "****Restart [%4.4s] Op %p ReturnValueFromCallee %p\n",
         AcpiUtGetNodeName (WalkState->MethodNode),
         WalkState->MethodCallOp, ReturnDesc));
 
     ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
         "    ReturnFromThisMethodUsed?=%X ResStack %p Walk %p\n",
         WalkState->ReturnUsed,
         WalkState->Results, WalkState));
 
     /* Did the called method return a value? */
 
     if (ReturnDesc)
     {
         /* Is the implicit return object the same as the return desc? */
 
         SameAsImplicitReturn = (WalkState->ImplicitReturnObj == ReturnDesc);
 
         /* Are we actually going to use the return value? */
 
         if (WalkState->ReturnUsed)
         {
             /* Save the return value from the previous method */
 
             Status = AcpiDsResultPush (ReturnDesc, WalkState);
             if (ACPI_FAILURE (Status))
             {
                 AcpiUtRemoveReference (ReturnDesc);
                 return_ACPI_STATUS (Status);
             }
 
             /*
              * Save as THIS method's return value in case it is returned
              * immediately to yet another method
              */
             WalkState->ReturnDesc = ReturnDesc;
         }
 
         /*
          * The following code is the optional support for the so-called
          * "implicit return". Some AML code assumes that the last value of the
          * method is "implicitly" returned to the caller, in the absence of an
          * explicit return value.
          *
          * Just save the last result of the method as the return value.
          *
          * NOTE: this is optional because the ASL language does not actually
          * support this behavior.
          */
         else if (!AcpiDsDoImplicitReturn (ReturnDesc, WalkState, FALSE) ||
                  SameAsImplicitReturn)
         {
             /*
              * Delete the return value if it will not be used by the
              * calling method or remove one reference if the explicit return
              * is the same as the implicit return value.
              */
             AcpiUtRemoveReference (ReturnDesc);
         }
     }
 
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsTerminateControlMethod
  *
  * PARAMETERS:  MethodDesc          - Method object
  *              WalkState           - State associated with the method
  *
  * RETURN:      None
  *
  * DESCRIPTION: Terminate a control method.  Delete everything that the method
  *              created, delete all locals and arguments, and delete the parse
  *              tree if requested.
  *
  * MUTEX:       Interpreter is locked
  *
  ******************************************************************************/
 
 void
 AcpiDsTerminateControlMethod (
     ACPI_OPERAND_OBJECT     *MethodDesc,
     ACPI_WALK_STATE         *WalkState)
 {
 
     ACPI_FUNCTION_TRACE_PTR (DsTerminateControlMethod, WalkState);
 
 
     /* MethodDesc is required, WalkState is optional */
 
     if (!MethodDesc)
     {
         return_VOID;
     }
 
     if (WalkState)
     {
         /* Delete all arguments and locals */
 
         AcpiDsMethodDataDeleteAll (WalkState);
 
         /*
          * If method is serialized, release the mutex and restore the
          * current sync level for this thread
          */
         if (MethodDesc->Method.Mutex)
         {
             /* Acquisition Depth handles recursive calls */
 
             MethodDesc->Method.Mutex->Mutex.AcquisitionDepth--;
             if (!MethodDesc->Method.Mutex->Mutex.AcquisitionDepth)
             {
                 WalkState->Thread->CurrentSyncLevel =
                     MethodDesc->Method.Mutex->Mutex.OriginalSyncLevel;
 
                 AcpiOsReleaseMutex (MethodDesc->Method.Mutex->Mutex.OsMutex);
                 MethodDesc->Method.Mutex->Mutex.ThreadId = 0;
             }
         }
 
         /*
          * Delete any namespace objects created anywhere within
          * the namespace by the execution of this method
          */
         AcpiNsDeleteNamespaceByOwner (MethodDesc->Method.OwnerId);
     }
 
     /* Decrement the thread count on the method */
 
     if (MethodDesc->Method.ThreadCount)
     {
         MethodDesc->Method.ThreadCount--;
     }
     else
     {
         ACPI_ERROR ((AE_INFO,
             "Invalid zero thread count in method"));
     }
 
     /* Are there any other threads currently executing this method? */
 
     if (MethodDesc->Method.ThreadCount)
     {
         /*
          * Additional threads. Do not release the OwnerId in this case,
          * we immediately reuse it for the next thread executing this method
          */
         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
             "*** Completed execution of one thread, %d threads remaining\n",
             MethodDesc->Method.ThreadCount));
     }
     else
     {
         /* This is the only executing thread for this method */
 
         /*
          * Support to dynamically change a method from NotSerialized to
          * Serialized if it appears that the method is incorrectly written and
          * does not support multiple thread execution. The best example of this
          * is if such a method creates namespace objects and blocks. A second
          * thread will fail with an AE_ALREADY_EXISTS exception
          *
          * This code is here because we must wait until the last thread exits
          * before creating the synchronization semaphore.
          */
         if ((MethodDesc->Method.MethodFlags & AML_METHOD_SERIALIZED) &&
             (!MethodDesc->Method.Mutex))
         {
             (void) AcpiDsCreateMethodMutex (MethodDesc);
         }
 
         /* No more threads, we can free the OwnerId */
 
         AcpiUtReleaseOwnerId (&MethodDesc->Method.OwnerId);
     }
 
     return_VOID;
 }