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minix3/drivers/power/acpi/dispatcher/dswstate.c

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/******************************************************************************
*
* Module Name: dswstate - Dispatcher parse tree walk management routines
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2010, 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 __DSWSTATE_C__
#include "acpi.h"
#include "accommon.h"
#include "acparser.h"
#include "acdispat.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_DISPATCHER
ACPI_MODULE_NAME ("dswstate")
/* Local prototypes */
static ACPI_STATUS
AcpiDsResultStackPush (
ACPI_WALK_STATE *WalkState);
static ACPI_STATUS
AcpiDsResultStackPop (
ACPI_WALK_STATE *WalkState);
/*******************************************************************************
*
* FUNCTION: AcpiDsResultPop
*
* PARAMETERS: Object - Where to return the popped object
* WalkState - Current Walk state
*
* RETURN: Status
*
* DESCRIPTION: Pop an object off the top of this walk's result stack
*
******************************************************************************/
ACPI_STATUS
AcpiDsResultPop (
ACPI_OPERAND_OBJECT **Object,
ACPI_WALK_STATE *WalkState)
{
UINT32 Index;
ACPI_GENERIC_STATE *State;
ACPI_STATUS Status;
ACPI_FUNCTION_NAME (DsResultPop);
State = WalkState->Results;
/* Incorrect state of result stack */
if (State && !WalkState->ResultCount)
{
ACPI_ERROR ((AE_INFO, "No results on result stack"));
return (AE_AML_INTERNAL);
}
if (!State && WalkState->ResultCount)
{
ACPI_ERROR ((AE_INFO, "No result state for result stack"));
return (AE_AML_INTERNAL);
}
/* Empty result stack */
if (!State)
{
ACPI_ERROR ((AE_INFO, "Result stack is empty! State=%p", WalkState));
return (AE_AML_NO_RETURN_VALUE);
}
/* Return object of the top element and clean that top element result stack */
WalkState->ResultCount--;
Index = (UINT32) WalkState->ResultCount % ACPI_RESULTS_FRAME_OBJ_NUM;
*Object = State->Results.ObjDesc [Index];
if (!*Object)
{
ACPI_ERROR ((AE_INFO, "No result objects on result stack, State=%p",
WalkState));
return (AE_AML_NO_RETURN_VALUE);
}
State->Results.ObjDesc [Index] = NULL;
if (Index == 0)
{
Status = AcpiDsResultStackPop (WalkState);
if (ACPI_FAILURE (Status))
{
return (Status);
}
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Obj=%p [%s] Index=%X State=%p Num=%X\n", *Object,
AcpiUtGetObjectTypeName (*Object),
Index, WalkState, WalkState->ResultCount));
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiDsResultPush
*
* PARAMETERS: Object - Where to return the popped object
* WalkState - Current Walk state
*
* RETURN: Status
*
* DESCRIPTION: Push an object onto the current result stack
*
******************************************************************************/
ACPI_STATUS
AcpiDsResultPush (
ACPI_OPERAND_OBJECT *Object,
ACPI_WALK_STATE *WalkState)
{
ACPI_GENERIC_STATE *State;
ACPI_STATUS Status;
UINT32 Index;
ACPI_FUNCTION_NAME (DsResultPush);
if (WalkState->ResultCount > WalkState->ResultSize)
{
ACPI_ERROR ((AE_INFO, "Result stack is full"));
return (AE_AML_INTERNAL);
}
else if (WalkState->ResultCount == WalkState->ResultSize)
{
/* Extend the result stack */
Status = AcpiDsResultStackPush (WalkState);
if (ACPI_FAILURE (Status))
{
ACPI_ERROR ((AE_INFO, "Failed to extend the result stack"));
return (Status);
}
}
if (!(WalkState->ResultCount < WalkState->ResultSize))
{
ACPI_ERROR ((AE_INFO, "No free elements in result stack"));
return (AE_AML_INTERNAL);
}
State = WalkState->Results;
if (!State)
{
ACPI_ERROR ((AE_INFO, "No result stack frame during push"));
return (AE_AML_INTERNAL);
}
if (!Object)
{
ACPI_ERROR ((AE_INFO,
"Null Object! Obj=%p State=%p Num=%u",
Object, WalkState, WalkState->ResultCount));
return (AE_BAD_PARAMETER);
}
/* Assign the address of object to the top free element of result stack */
Index = (UINT32) WalkState->ResultCount % ACPI_RESULTS_FRAME_OBJ_NUM;
State->Results.ObjDesc [Index] = Object;
WalkState->ResultCount++;
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
Object, AcpiUtGetObjectTypeName ((ACPI_OPERAND_OBJECT *) Object),
WalkState, WalkState->ResultCount, WalkState->CurrentResult));
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiDsResultStackPush
*
* PARAMETERS: WalkState - Current Walk state
*
* RETURN: Status
*
* DESCRIPTION: Push an object onto the WalkState result stack
*
******************************************************************************/
static ACPI_STATUS
AcpiDsResultStackPush (
ACPI_WALK_STATE *WalkState)
{
ACPI_GENERIC_STATE *State;
ACPI_FUNCTION_NAME (DsResultStackPush);
/* Check for stack overflow */
if (((UINT32) WalkState->ResultSize + ACPI_RESULTS_FRAME_OBJ_NUM) >
ACPI_RESULTS_OBJ_NUM_MAX)
{
ACPI_ERROR ((AE_INFO, "Result stack overflow: State=%p Num=%u",
WalkState, WalkState->ResultSize));
return (AE_STACK_OVERFLOW);
}
State = AcpiUtCreateGenericState ();
if (!State)
{
return (AE_NO_MEMORY);
}
State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_RESULT;
AcpiUtPushGenericState (&WalkState->Results, State);
/* Increase the length of the result stack by the length of frame */
WalkState->ResultSize += ACPI_RESULTS_FRAME_OBJ_NUM;
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Results=%p State=%p\n",
State, WalkState));
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiDsResultStackPop
*
* PARAMETERS: WalkState - Current Walk state
*
* RETURN: Status
*
* DESCRIPTION: Pop an object off of the WalkState result stack
*
******************************************************************************/
static ACPI_STATUS
AcpiDsResultStackPop (
ACPI_WALK_STATE *WalkState)
{
ACPI_GENERIC_STATE *State;
ACPI_FUNCTION_NAME (DsResultStackPop);
/* Check for stack underflow */
if (WalkState->Results == NULL)
{
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Result stack underflow - State=%p\n",
WalkState));
return (AE_AML_NO_OPERAND);
}
if (WalkState->ResultSize < ACPI_RESULTS_FRAME_OBJ_NUM)
{
ACPI_ERROR ((AE_INFO, "Insufficient result stack size"));
return (AE_AML_INTERNAL);
}
State = AcpiUtPopGenericState (&WalkState->Results);
AcpiUtDeleteGenericState (State);
/* Decrease the length of result stack by the length of frame */
WalkState->ResultSize -= ACPI_RESULTS_FRAME_OBJ_NUM;
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Result=%p RemainingResults=%X State=%p\n",
State, WalkState->ResultCount, WalkState));
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiDsObjStackPush
*
* PARAMETERS: Object - Object to push
* WalkState - Current Walk state
*
* RETURN: Status
*
* DESCRIPTION: Push an object onto this walk's object/operand stack
*
******************************************************************************/
ACPI_STATUS
AcpiDsObjStackPush (
void *Object,
ACPI_WALK_STATE *WalkState)
{
ACPI_FUNCTION_NAME (DsObjStackPush);
/* Check for stack overflow */
if (WalkState->NumOperands >= ACPI_OBJ_NUM_OPERANDS)
{
ACPI_ERROR ((AE_INFO,
"Object stack overflow! Obj=%p State=%p #Ops=%u",
Object, WalkState, WalkState->NumOperands));
return (AE_STACK_OVERFLOW);
}
/* Put the object onto the stack */
WalkState->Operands [WalkState->OperandIndex] = Object;
WalkState->NumOperands++;
/* For the usual order of filling the operand stack */
WalkState->OperandIndex++;
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
Object, AcpiUtGetObjectTypeName ((ACPI_OPERAND_OBJECT *) Object),
WalkState, WalkState->NumOperands));
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiDsObjStackPop
*
* PARAMETERS: PopCount - Number of objects/entries to pop
* WalkState - Current Walk state
*
* RETURN: Status
*
* DESCRIPTION: Pop this walk's object stack. Objects on the stack are NOT
* deleted by this routine.
*
******************************************************************************/
ACPI_STATUS
AcpiDsObjStackPop (
UINT32 PopCount,
ACPI_WALK_STATE *WalkState)
{
UINT32 i;
ACPI_FUNCTION_NAME (DsObjStackPop);
for (i = 0; i < PopCount; i++)
{
/* Check for stack underflow */
if (WalkState->NumOperands == 0)
{
ACPI_ERROR ((AE_INFO,
"Object stack underflow! Count=%X State=%p #Ops=%u",
PopCount, WalkState, WalkState->NumOperands));
return (AE_STACK_UNDERFLOW);
}
/* Just set the stack entry to null */
WalkState->NumOperands--;
WalkState->Operands [WalkState->NumOperands] = NULL;
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%u\n",
PopCount, WalkState, WalkState->NumOperands));
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiDsObjStackPopAndDelete
*
* PARAMETERS: PopCount - Number of objects/entries to pop
* WalkState - Current Walk state
*
* RETURN: Status
*
* DESCRIPTION: Pop this walk's object stack and delete each object that is
* popped off.
*
******************************************************************************/
void
AcpiDsObjStackPopAndDelete (
UINT32 PopCount,
ACPI_WALK_STATE *WalkState)
{
INT32 i;
ACPI_OPERAND_OBJECT *ObjDesc;
ACPI_FUNCTION_NAME (DsObjStackPopAndDelete);
if (PopCount == 0)
{
return;
}
for (i = (INT32) PopCount - 1; i >= 0; i--)
{
if (WalkState->NumOperands == 0)
{
return;
}
/* Pop the stack and delete an object if present in this stack entry */
WalkState->NumOperands--;
ObjDesc = WalkState->Operands [i];
if (ObjDesc)
{
AcpiUtRemoveReference (WalkState->Operands [i]);
WalkState->Operands [i] = NULL;
}
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
PopCount, WalkState, WalkState->NumOperands));
}
/*******************************************************************************
*
* FUNCTION: AcpiDsGetCurrentWalkState
*
* PARAMETERS: Thread - Get current active state for this Thread
*
* RETURN: Pointer to the current walk state
*
* DESCRIPTION: Get the walk state that is at the head of the list (the "current"
* walk state.)
*
******************************************************************************/
ACPI_WALK_STATE *
AcpiDsGetCurrentWalkState (
ACPI_THREAD_STATE *Thread)
{
ACPI_FUNCTION_NAME (DsGetCurrentWalkState);
if (!Thread)
{
return (NULL);
}
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Current WalkState %p\n",
Thread->WalkStateList));
return (Thread->WalkStateList);
}
/*******************************************************************************
*
* FUNCTION: AcpiDsPushWalkState
*
* PARAMETERS: WalkState - State to push
* Thread - Thread state object
*
* RETURN: None
*
* DESCRIPTION: Place the Thread state at the head of the state list
*
******************************************************************************/
void
AcpiDsPushWalkState (
ACPI_WALK_STATE *WalkState,
ACPI_THREAD_STATE *Thread)
{
ACPI_FUNCTION_TRACE (DsPushWalkState);
WalkState->Next = Thread->WalkStateList;
Thread->WalkStateList = WalkState;
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: AcpiDsPopWalkState
*
* PARAMETERS: Thread - Current thread state
*
* RETURN: A WalkState object popped from the thread's stack
*
* DESCRIPTION: Remove and return the walkstate object that is at the head of
* the walk stack for the given walk list. NULL indicates that
* the list is empty.
*
******************************************************************************/
ACPI_WALK_STATE *
AcpiDsPopWalkState (
ACPI_THREAD_STATE *Thread)
{
ACPI_WALK_STATE *WalkState;
ACPI_FUNCTION_TRACE (DsPopWalkState);
WalkState = Thread->WalkStateList;
if (WalkState)
{
/* Next walk state becomes the current walk state */
Thread->WalkStateList = WalkState->Next;
/*
* Don't clear the NEXT field, this serves as an indicator
* that there is a parent WALK STATE
* Do Not: WalkState->Next = NULL;
*/
}
return_PTR (WalkState);
}
/*******************************************************************************
*
* FUNCTION: AcpiDsCreateWalkState
*
* PARAMETERS: OwnerId - ID for object creation
* Origin - Starting point for this walk
* MethodDesc - Method object
* Thread - Current thread state
*
* RETURN: Pointer to the new walk state.
*
* DESCRIPTION: Allocate and initialize a new walk state. The current walk
* state is set to this new state.
*
******************************************************************************/
ACPI_WALK_STATE *
AcpiDsCreateWalkState (
ACPI_OWNER_ID OwnerId,
ACPI_PARSE_OBJECT *Origin,
ACPI_OPERAND_OBJECT *MethodDesc,
ACPI_THREAD_STATE *Thread)
{
ACPI_WALK_STATE *WalkState;
ACPI_FUNCTION_TRACE (DsCreateWalkState);
WalkState = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_WALK_STATE));
if (!WalkState)
{
return_PTR (NULL);
}
WalkState->DescriptorType = ACPI_DESC_TYPE_WALK;
WalkState->MethodDesc = MethodDesc;
WalkState->OwnerId = OwnerId;
WalkState->Origin = Origin;
WalkState->Thread = Thread;
WalkState->ParserState.StartOp = Origin;
/* Init the method args/local */
#if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
AcpiDsMethodDataInit (WalkState);
#endif
/* Put the new state at the head of the walk list */
if (Thread)
{
AcpiDsPushWalkState (WalkState, Thread);
}
return_PTR (WalkState);
}
/*******************************************************************************
*
* FUNCTION: AcpiDsInitAmlWalk
*
* PARAMETERS: WalkState - New state to be initialized
* Op - Current parse op
* MethodNode - Control method NS node, if any
* AmlStart - Start of AML
* AmlLength - Length of AML
* Info - Method info block (params, etc.)
* PassNumber - 1, 2, or 3
*
* RETURN: Status
*
* DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk
*
******************************************************************************/
ACPI_STATUS
AcpiDsInitAmlWalk (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op,
ACPI_NAMESPACE_NODE *MethodNode,
UINT8 *AmlStart,
UINT32 AmlLength,
ACPI_EVALUATE_INFO *Info,
UINT8 PassNumber)
{
ACPI_STATUS Status;
ACPI_PARSE_STATE *ParserState = &WalkState->ParserState;
ACPI_PARSE_OBJECT *ExtraOp;
ACPI_FUNCTION_TRACE (DsInitAmlWalk);
WalkState->ParserState.Aml =
WalkState->ParserState.AmlStart = AmlStart;
WalkState->ParserState.AmlEnd =
WalkState->ParserState.PkgEnd = AmlStart + AmlLength;
/* The NextOp of the NextWalk will be the beginning of the method */
WalkState->NextOp = NULL;
WalkState->PassNumber = PassNumber;
if (Info)
{
WalkState->Params = Info->Parameters;
WalkState->CallerReturnDesc = &Info->ReturnObject;
}
Status = AcpiPsInitScope (&WalkState->ParserState, Op);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
if (MethodNode)
{
WalkState->ParserState.StartNode = MethodNode;
WalkState->WalkType = ACPI_WALK_METHOD;
WalkState->MethodNode = MethodNode;
WalkState->MethodDesc = AcpiNsGetAttachedObject (MethodNode);
/* Push start scope on scope stack and make it current */
Status = AcpiDsScopeStackPush (MethodNode, ACPI_TYPE_METHOD, WalkState);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Init the method arguments */
Status = AcpiDsMethodDataInitArgs (WalkState->Params,
ACPI_METHOD_NUM_ARGS, WalkState);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
else
{
/*
* Setup the current scope.
* Find a Named Op that has a namespace node associated with it.
* search upwards from this Op. Current scope is the first
* Op with a namespace node.
*/
ExtraOp = ParserState->StartOp;
while (ExtraOp && !ExtraOp->Common.Node)
{
ExtraOp = ExtraOp->Common.Parent;
}
if (!ExtraOp)
{
ParserState->StartNode = NULL;
}
else
{
ParserState->StartNode = ExtraOp->Common.Node;
}
if (ParserState->StartNode)
{
/* Push start scope on scope stack and make it current */
Status = AcpiDsScopeStackPush (ParserState->StartNode,
ParserState->StartNode->Type, WalkState);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
}
Status = AcpiDsInitCallbacks (WalkState, PassNumber);
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiDsDeleteWalkState
*
* PARAMETERS: WalkState - State to delete
*
* RETURN: Status
*
* DESCRIPTION: Delete a walk state including all internal data structures
*
******************************************************************************/
void
AcpiDsDeleteWalkState (
ACPI_WALK_STATE *WalkState)
{
ACPI_GENERIC_STATE *State;
ACPI_FUNCTION_TRACE_PTR (DsDeleteWalkState, WalkState);
if (!WalkState)
{
return;
}
if (WalkState->DescriptorType != ACPI_DESC_TYPE_WALK)
{
ACPI_ERROR ((AE_INFO, "%p is not a valid walk state",
WalkState));
return;
}
/* There should not be any open scopes */
if (WalkState->ParserState.Scope)
{
ACPI_ERROR ((AE_INFO, "%p walk still has a scope list",
WalkState));
AcpiPsCleanupScope (&WalkState->ParserState);
}
/* Always must free any linked control states */
while (WalkState->ControlState)
{
State = WalkState->ControlState;
WalkState->ControlState = State->Common.Next;
AcpiUtDeleteGenericState (State);
}
/* Always must free any linked parse states */
while (WalkState->ScopeInfo)
{
State = WalkState->ScopeInfo;
WalkState->ScopeInfo = State->Common.Next;
AcpiUtDeleteGenericState (State);
}
/* Always must free any stacked result states */
while (WalkState->Results)
{
State = WalkState->Results;
WalkState->Results = State->Common.Next;
AcpiUtDeleteGenericState (State);
}
ACPI_FREE (WalkState);
return_VOID;
}
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