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 /*******************************************************************************
  *
  * Module Name: utdelete - object deletion and reference count utilities
  *
  ******************************************************************************/
 
 /******************************************************************************
  *
  * 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 __UTDELETE_C__
 
 #include "acpi.h"
 #include "accommon.h"
 #include "acinterp.h"
 #include "acnamesp.h"
 #include "acevents.h"
 
 
 #define _COMPONENT          ACPI_UTILITIES
         ACPI_MODULE_NAME    ("utdelete")
 
 /* Local prototypes */
 
 static void
 AcpiUtDeleteInternalObj (
     ACPI_OPERAND_OBJECT     *Object);
 
 static void
 AcpiUtUpdateRefCount (
     ACPI_OPERAND_OBJECT     *Object,
     UINT32                  Action);
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtDeleteInternalObj
  *
  * PARAMETERS:  Object         - Object to be deleted
  *
  * RETURN:      None
  *
  * DESCRIPTION: Low level object deletion, after reference counts have been
  *              updated (All reference counts, including sub-objects!)
  *
  ******************************************************************************/
 
 static void
 AcpiUtDeleteInternalObj (
     ACPI_OPERAND_OBJECT     *Object)
 {
     void                    *ObjPointer = NULL;
     ACPI_OPERAND_OBJECT     *HandlerDesc;
     ACPI_OPERAND_OBJECT     *SecondDesc;
     ACPI_OPERAND_OBJECT     *NextDesc;
     ACPI_OPERAND_OBJECT     **LastObjPtr;
 
 
     ACPI_FUNCTION_TRACE_PTR (UtDeleteInternalObj, Object);
 
 
     if (!Object)
     {
         return_VOID;
     }
 
     /*
      * Must delete or free any pointers within the object that are not
      * actual ACPI objects (for example, a raw buffer pointer).
      */
     switch (Object->Common.Type)
     {
     case ACPI_TYPE_STRING:
 
         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "**** String %p, ptr %p\n",
             Object, Object->String.Pointer));
 
         /* Free the actual string buffer */
 
         if (!(Object->Common.Flags & AOPOBJ_STATIC_POINTER))
         {
             /* But only if it is NOT a pointer into an ACPI table */
 
             ObjPointer = Object->String.Pointer;
         }
         break;
 
 
     case ACPI_TYPE_BUFFER:
 
         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "**** Buffer %p, ptr %p\n",
             Object, Object->Buffer.Pointer));
 
         /* Free the actual buffer */
 
         if (!(Object->Common.Flags & AOPOBJ_STATIC_POINTER))
         {
             /* But only if it is NOT a pointer into an ACPI table */
 
             ObjPointer = Object->Buffer.Pointer;
         }
         break;
 
 
     case ACPI_TYPE_PACKAGE:
 
         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, " **** Package of count %X\n",
             Object->Package.Count));
 
         /*
          * Elements of the package are not handled here, they are deleted
          * separately
          */
 
         /* Free the (variable length) element pointer array */
 
         ObjPointer = Object->Package.Elements;
         break;
 
 
     /*
      * These objects have a possible list of notify handlers.
      * Device object also may have a GPE block.
      */
     case ACPI_TYPE_DEVICE:
 
         if (Object->Device.GpeBlock)
         {
             (void) AcpiEvDeleteGpeBlock (Object->Device.GpeBlock);
         }
 
         /*lint -fallthrough */
 
     case ACPI_TYPE_PROCESSOR:
     case ACPI_TYPE_THERMAL:
 
         /* Walk the notify handler list for this object */
 
         HandlerDesc = Object->CommonNotify.Handler;
         while (HandlerDesc)
         {
             NextDesc = HandlerDesc->AddressSpace.Next;
             AcpiUtRemoveReference (HandlerDesc);
             HandlerDesc = NextDesc;
         }
         break;
 
 
     case ACPI_TYPE_MUTEX:
 
         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
             "***** Mutex %p, OS Mutex %p\n",
             Object, Object->Mutex.OsMutex));
 
         if (Object == AcpiGbl_GlobalLockMutex)
         {
             /* Global Lock has extra semaphore */
 
             (void) AcpiOsDeleteSemaphore (AcpiGbl_GlobalLockSemaphore);
             AcpiGbl_GlobalLockSemaphore = NULL;
 
             AcpiOsDeleteMutex (Object->Mutex.OsMutex);
             AcpiGbl_GlobalLockMutex = NULL;
         }
         else
         {
             AcpiExUnlinkMutex (Object);
             AcpiOsDeleteMutex (Object->Mutex.OsMutex);
         }
         break;
 
 
     case ACPI_TYPE_EVENT:
 
         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
             "***** Event %p, OS Semaphore %p\n",
             Object, Object->Event.OsSemaphore));
 
         (void) AcpiOsDeleteSemaphore (Object->Event.OsSemaphore);
         Object->Event.OsSemaphore = NULL;
         break;
 
 
     case ACPI_TYPE_METHOD:
 
         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
             "***** Method %p\n", Object));
 
         /* Delete the method mutex if it exists */
 
         if (Object->Method.Mutex)
         {
             AcpiOsDeleteMutex (Object->Method.Mutex->Mutex.OsMutex);
             AcpiUtDeleteObjectDesc (Object->Method.Mutex);
             Object->Method.Mutex = NULL;
         }
         break;
 
 
     case ACPI_TYPE_REGION:
 
         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
             "***** Region %p\n", Object));
 
         SecondDesc = AcpiNsGetSecondaryObject (Object);
         if (SecondDesc)
         {
             /*
              * Free the RegionContext if and only if the handler is one of the
              * default handlers -- and therefore, we created the context object
              * locally, it was not created by an external caller.
              */
             HandlerDesc = Object->Region.Handler;
             if (HandlerDesc)
             {
                 NextDesc = HandlerDesc->AddressSpace.RegionList;
                 LastObjPtr = &HandlerDesc->AddressSpace.RegionList;
 
                 /* Remove the region object from the handler's list */
 
                 while (NextDesc)
                 {
                     if (NextDesc == Object)
                     {
                         *LastObjPtr = NextDesc->Region.Next;
                         break;
                     }
 
                     /* Walk the linked list of handler */
 
                     LastObjPtr = &NextDesc->Region.Next;
                     NextDesc = NextDesc->Region.Next;
                 }
 
                 if (HandlerDesc->AddressSpace.HandlerFlags &
                     ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)
                 {
                     /* Deactivate region and free region context */
 
                     if (HandlerDesc->AddressSpace.Setup)
                     {
                         (void) HandlerDesc->AddressSpace.Setup (Object,
                             ACPI_REGION_DEACTIVATE,
                             HandlerDesc->AddressSpace.Context,
                             &SecondDesc->Extra.RegionContext);
                     }
                 }
 
                 AcpiUtRemoveReference (HandlerDesc);
             }
 
             /* Now we can free the Extra object */
 
             AcpiUtDeleteObjectDesc (SecondDesc);
         }
         break;
 
 
     case ACPI_TYPE_BUFFER_FIELD:
 
         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
             "***** Buffer Field %p\n", Object));
 
         SecondDesc = AcpiNsGetSecondaryObject (Object);
         if (SecondDesc)
         {
             AcpiUtDeleteObjectDesc (SecondDesc);
         }
         break;
 
 
     case ACPI_TYPE_LOCAL_BANK_FIELD:
 
         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
             "***** Bank Field %p\n", Object));
 
         SecondDesc = AcpiNsGetSecondaryObject (Object);
         if (SecondDesc)
         {
             AcpiUtDeleteObjectDesc (SecondDesc);
         }
         break;
 
 
     default:
         break;
     }
 
     /* Free any allocated memory (pointer within the object) found above */
 
     if (ObjPointer)
     {
         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Deleting Object Subptr %p\n",
             ObjPointer));
         ACPI_FREE (ObjPointer);
     }
 
     /* Now the object can be safely deleted */
 
     ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
         Object, AcpiUtGetObjectTypeName (Object)));
 
     AcpiUtDeleteObjectDesc (Object);
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtDeleteInternalObjectList
  *
  * PARAMETERS:  ObjList         - Pointer to the list to be deleted
  *
  * RETURN:      None
  *
  * DESCRIPTION: This function deletes an internal object list, including both
  *              simple objects and package objects
  *
  ******************************************************************************/
 
 void
 AcpiUtDeleteInternalObjectList (
     ACPI_OPERAND_OBJECT     **ObjList)
 {
     ACPI_OPERAND_OBJECT     **InternalObj;
 
 
     ACPI_FUNCTION_TRACE (UtDeleteInternalObjectList);
 
 
     /* Walk the null-terminated internal list */
 
     for (InternalObj = ObjList; *InternalObj; InternalObj++)
     {
         AcpiUtRemoveReference (*InternalObj);
     }
 
     /* Free the combined parameter pointer list and object array */
 
     ACPI_FREE (ObjList);
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtUpdateRefCount
  *
  * PARAMETERS:  Object          - Object whose ref count is to be updated
  *              Action          - What to do
  *
  * RETURN:      New ref count
  *
  * DESCRIPTION: Modify the ref count and return it.
  *
  ******************************************************************************/
 
 static void
 AcpiUtUpdateRefCount (
     ACPI_OPERAND_OBJECT     *Object,
     UINT32                  Action)
 {
     UINT16                  Count;
     UINT16                  NewCount;
 
 
     ACPI_FUNCTION_NAME (UtUpdateRefCount);
 
 
     if (!Object)
     {
         return;
     }
 
     Count = Object->Common.ReferenceCount;
     NewCount = Count;
 
     /*
      * Perform the reference count action (increment, decrement, force delete)
      */
     switch (Action)
     {
     case REF_INCREMENT:
 
         NewCount++;
         Object->Common.ReferenceCount = NewCount;
 
         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
             "Obj %p Refs=%X, [Incremented]\n",
             Object, NewCount));
         break;
 
     case REF_DECREMENT:
 
         if (Count < 1)
         {
             ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
                 "Obj %p Refs=%X, can't decrement! (Set to 0)\n",
                 Object, NewCount));
 
             NewCount = 0;
         }
         else
         {
             NewCount--;
 
             ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
                 "Obj %p Refs=%X, [Decremented]\n",
                 Object, NewCount));
         }
 
         if (Object->Common.Type == ACPI_TYPE_METHOD)
         {
             ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
                 "Method Obj %p Refs=%X, [Decremented]\n", Object, NewCount));
         }
 
         Object->Common.ReferenceCount = NewCount;
         if (NewCount == 0)
         {
             AcpiUtDeleteInternalObj (Object);
         }
         break;
 
     case REF_FORCE_DELETE:
 
         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
             "Obj %p Refs=%X, Force delete! (Set to 0)\n", Object, Count));
 
         NewCount = 0;
         Object->Common.ReferenceCount = NewCount;
         AcpiUtDeleteInternalObj (Object);
         break;
 
     default:
 
         ACPI_ERROR ((AE_INFO, "Unknown action (%X)", Action));
         break;
     }
 
     /*
      * Sanity check the reference count, for debug purposes only.
      * (A deleted object will have a huge reference count)
      */
     if (Count > ACPI_MAX_REFERENCE_COUNT)
     {
         ACPI_WARNING ((AE_INFO,
             "Large Reference Count (%X) in object %p", Count, Object));
     }
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtUpdateObjectReference
  *
  * PARAMETERS:  Object              - Increment ref count for this object
  *                                    and all sub-objects
  *              Action              - Either REF_INCREMENT or REF_DECREMENT or
  *                                    REF_FORCE_DELETE
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Increment the object reference count
  *
  * Object references are incremented when:
  * 1) An object is attached to a Node (namespace object)
  * 2) An object is copied (all subobjects must be incremented)
  *
  * Object references are decremented when:
  * 1) An object is detached from an Node
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiUtUpdateObjectReference (
     ACPI_OPERAND_OBJECT     *Object,
     UINT16                  Action)
 {
     ACPI_STATUS             Status = AE_OK;
     ACPI_GENERIC_STATE      *StateList = NULL;
     ACPI_OPERAND_OBJECT     *NextObject = NULL;
     ACPI_GENERIC_STATE      *State;
     UINT32                  i;
 
 
     ACPI_FUNCTION_TRACE_PTR (UtUpdateObjectReference, Object);
 
 
     while (Object)
     {
         /* Make sure that this isn't a namespace handle */
 
         if (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_NAMED)
         {
             ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
                 "Object %p is NS handle\n", Object));
             return_ACPI_STATUS (AE_OK);
         }
 
         /*
          * All sub-objects must have their reference count incremented also.
          * Different object types have different subobjects.
          */
         switch (Object->Common.Type)
         {
         case ACPI_TYPE_DEVICE:
         case ACPI_TYPE_PROCESSOR:
         case ACPI_TYPE_POWER:
         case ACPI_TYPE_THERMAL:
 
             /* Update the notify objects for these types (if present) */
 
             AcpiUtUpdateRefCount (Object->CommonNotify.SystemNotify, Action);
             AcpiUtUpdateRefCount (Object->CommonNotify.DeviceNotify, Action);
             break;
 
         case ACPI_TYPE_PACKAGE:
             /*
              * We must update all the sub-objects of the package,
              * each of whom may have their own sub-objects.
              */
             for (i = 0; i < Object->Package.Count; i++)
             {
                 /*
                  * Push each element onto the stack for later processing.
                  * Note: There can be null elements within the package,
                  * these are simply ignored
                  */
                 Status = AcpiUtCreateUpdateStateAndPush (
                             Object->Package.Elements[i], Action, &StateList);
                 if (ACPI_FAILURE (Status))
                 {
                     goto ErrorExit;
                 }
             }
             break;
 
         case ACPI_TYPE_BUFFER_FIELD:
 
             NextObject = Object->BufferField.BufferObj;
             break;
 
         case ACPI_TYPE_LOCAL_REGION_FIELD:
 
             NextObject = Object->Field.RegionObj;
             break;
 
         case ACPI_TYPE_LOCAL_BANK_FIELD:
 
             NextObject = Object->BankField.BankObj;
             Status = AcpiUtCreateUpdateStateAndPush (
                         Object->BankField.RegionObj, Action, &StateList);
             if (ACPI_FAILURE (Status))
             {
                 goto ErrorExit;
             }
             break;
 
         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 
             NextObject = Object->IndexField.IndexObj;
             Status = AcpiUtCreateUpdateStateAndPush (
                         Object->IndexField.DataObj, Action, &StateList);
             if (ACPI_FAILURE (Status))
             {
                 goto ErrorExit;
             }
             break;
 
         case ACPI_TYPE_LOCAL_REFERENCE:
             /*
              * The target of an Index (a package, string, or buffer) or a named
              * reference must track changes to the ref count of the index or
              * target object.
              */
             if ((Object->Reference.Class == ACPI_REFCLASS_INDEX) ||
                 (Object->Reference.Class== ACPI_REFCLASS_NAME))
             {
                 NextObject = Object->Reference.Object;
             }
             break;
 
         case ACPI_TYPE_REGION:
         default:
             break; /* No subobjects for all other types */
         }
 
         /*
          * Now we can update the count in the main object. This can only
          * happen after we update the sub-objects in case this causes the
          * main object to be deleted.
          */
         AcpiUtUpdateRefCount (Object, Action);
         Object = NULL;
 
         /* Move on to the next object to be updated */
 
         if (NextObject)
         {
             Object = NextObject;
             NextObject = NULL;
         }
         else if (StateList)
         {
             State = AcpiUtPopGenericState (&StateList);
             Object = State->Update.Object;
             AcpiUtDeleteGenericState (State);
         }
     }
 
     return_ACPI_STATUS (AE_OK);
 
 
 ErrorExit:
 
     ACPI_EXCEPTION ((AE_INFO, Status,
         "Could not update object reference count"));
 
     /* Free any stacked Update State objects */
 
     while (StateList)
     {
         State = AcpiUtPopGenericState (&StateList);
         AcpiUtDeleteGenericState (State);
     }
 
     return_ACPI_STATUS (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtAddReference
  *
  * PARAMETERS:  Object          - Object whose reference count is to be
  *                                incremented
  *
  * RETURN:      None
  *
  * DESCRIPTION: Add one reference to an ACPI object
  *
  ******************************************************************************/
 
 void
 AcpiUtAddReference (
     ACPI_OPERAND_OBJECT     *Object)
 {
 
     ACPI_FUNCTION_TRACE_PTR (UtAddReference, Object);
 
 
     /* Ensure that we have a valid object */
 
     if (!AcpiUtValidInternalObject (Object))
     {
         return_VOID;
     }
 
     ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
         "Obj %p Current Refs=%X [To Be Incremented]\n",
         Object, Object->Common.ReferenceCount));
 
     /* Increment the reference count */
 
     (void) AcpiUtUpdateObjectReference (Object, REF_INCREMENT);
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtRemoveReference
  *
  * PARAMETERS:  Object         - Object whose ref count will be decremented
  *
  * RETURN:      None
  *
  * DESCRIPTION: Decrement the reference count of an ACPI internal object
  *
  ******************************************************************************/
 
 void
 AcpiUtRemoveReference (
     ACPI_OPERAND_OBJECT     *Object)
 {
 
     ACPI_FUNCTION_TRACE_PTR (UtRemoveReference, Object);
 
 
     /*
      * Allow a NULL pointer to be passed in, just ignore it. This saves
      * each caller from having to check. Also, ignore NS nodes.
      *
      */
     if (!Object ||
         (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_NAMED))
 
     {
         return_VOID;
     }
 
     /* Ensure that we have a valid object */
 
     if (!AcpiUtValidInternalObject (Object))
     {
         return_VOID;
     }
 
     ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
         "Obj %p Current Refs=%X [To Be Decremented]\n",
         Object, Object->Common.ReferenceCount));
 
     /*
      * Decrement the reference count, and only actually delete the object
      * if the reference count becomes 0. (Must also decrement the ref count
      * of all subobjects!)
      */
     (void) AcpiUtUpdateObjectReference (Object, REF_DECREMENT);
     return_VOID;
 }