1 /******************************************************************************
2  *
3  * Module Name: dswload2 - Dispatcher second pass namespace load callbacks
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2016, Intel Corp.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43 
44 #include "acpi.h"
45 #include "accommon.h"
46 #include "acparser.h"
47 #include "amlcode.h"
48 #include "acdispat.h"
49 #include "acinterp.h"
50 #include "acnamesp.h"
51 #include "acevents.h"
52 
53 #define _COMPONENT          ACPI_DISPATCHER
54         ACPI_MODULE_NAME    ("dswload2")
55 
56 
57 /*******************************************************************************
58  *
59  * FUNCTION:    AcpiDsLoad2BeginOp
60  *
61  * PARAMETERS:  WalkState       - Current state of the parse tree walk
62  *              OutOp           - Wher to return op if a new one is created
63  *
64  * RETURN:      Status
65  *
66  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
67  *
68  ******************************************************************************/
69 
70 ACPI_STATUS
71 AcpiDsLoad2BeginOp (
72     ACPI_WALK_STATE         *WalkState,
73     ACPI_PARSE_OBJECT       **OutOp)
74 {
75     ACPI_PARSE_OBJECT       *Op;
76     ACPI_NAMESPACE_NODE     *Node;
77     ACPI_STATUS             Status;
78     ACPI_OBJECT_TYPE        ObjectType;
79     char                    *BufferPtr;
80     UINT32                  Flags;
81 
82 
83     ACPI_FUNCTION_TRACE (DsLoad2BeginOp);
84 
85 
86     Op = WalkState->Op;
87     ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op=%p State=%p\n", Op, WalkState));
88 
89     if (Op)
90     {
91         if ((WalkState->ControlState) &&
92             (WalkState->ControlState->Common.State ==
93                 ACPI_CONTROL_CONDITIONAL_EXECUTING))
94         {
95             /* We are executing a while loop outside of a method */
96 
97             Status = AcpiDsExecBeginOp (WalkState, OutOp);
98             return_ACPI_STATUS (Status);
99         }
100 
101         /* We only care about Namespace opcodes here */
102 
103         if ((!(WalkState->OpInfo->Flags & AML_NSOPCODE)   &&
104               (WalkState->Opcode != AML_INT_NAMEPATH_OP)) ||
105             (!(WalkState->OpInfo->Flags & AML_NAMED)))
106         {
107             return_ACPI_STATUS (AE_OK);
108         }
109 
110         /* Get the name we are going to enter or lookup in the namespace */
111 
112         if (WalkState->Opcode == AML_INT_NAMEPATH_OP)
113         {
114             /* For Namepath op, get the path string */
115 
116             BufferPtr = Op->Common.Value.String;
117             if (!BufferPtr)
118             {
119                 /* No name, just exit */
120 
121                 return_ACPI_STATUS (AE_OK);
122             }
123         }
124         else
125         {
126             /* Get name from the op */
127 
128             BufferPtr = ACPI_CAST_PTR (char, &Op->Named.Name);
129         }
130     }
131     else
132     {
133         /* Get the namestring from the raw AML */
134 
135         BufferPtr = AcpiPsGetNextNamestring (&WalkState->ParserState);
136     }
137 
138     /* Map the opcode into an internal object type */
139 
140     ObjectType = WalkState->OpInfo->ObjectType;
141 
142     ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
143         "State=%p Op=%p Type=%X\n", WalkState, Op, ObjectType));
144 
145     switch (WalkState->Opcode)
146     {
147     case AML_FIELD_OP:
148     case AML_BANK_FIELD_OP:
149     case AML_INDEX_FIELD_OP:
150 
151         Node = NULL;
152         Status = AE_OK;
153         break;
154 
155     case AML_INT_NAMEPATH_OP:
156         /*
157          * The NamePath is an object reference to an existing object.
158          * Don't enter the name into the namespace, but look it up
159          * for use later.
160          */
161         Status = AcpiNsLookup (WalkState->ScopeInfo, BufferPtr, ObjectType,
162             ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
163             WalkState, &(Node));
164         break;
165 
166     case AML_SCOPE_OP:
167 
168         /* Special case for Scope(\) -> refers to the Root node */
169 
170         if (Op && (Op->Named.Node == AcpiGbl_RootNode))
171         {
172             Node = Op->Named.Node;
173 
174             Status = AcpiDsScopeStackPush (Node, ObjectType, WalkState);
175             if (ACPI_FAILURE (Status))
176             {
177                 return_ACPI_STATUS (Status);
178             }
179         }
180         else
181         {
182             /*
183              * The Path is an object reference to an existing object.
184              * Don't enter the name into the namespace, but look it up
185              * for use later.
186              */
187             Status = AcpiNsLookup (WalkState->ScopeInfo, BufferPtr, ObjectType,
188                 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
189                 WalkState, &(Node));
190             if (ACPI_FAILURE (Status))
191             {
192 #ifdef ACPI_ASL_COMPILER
193                 if (Status == AE_NOT_FOUND)
194                 {
195                     Status = AE_OK;
196                 }
197                 else
198                 {
199                     ACPI_ERROR_NAMESPACE (BufferPtr, Status);
200                 }
201 #else
202                 ACPI_ERROR_NAMESPACE (BufferPtr, Status);
203 #endif
204                 return_ACPI_STATUS (Status);
205             }
206         }
207 
208         /*
209          * We must check to make sure that the target is
210          * one of the opcodes that actually opens a scope
211          */
212         switch (Node->Type)
213         {
214         case ACPI_TYPE_ANY:
215         case ACPI_TYPE_LOCAL_SCOPE:         /* Scope */
216         case ACPI_TYPE_DEVICE:
217         case ACPI_TYPE_POWER:
218         case ACPI_TYPE_PROCESSOR:
219         case ACPI_TYPE_THERMAL:
220 
221             /* These are acceptable types */
222             break;
223 
224         case ACPI_TYPE_INTEGER:
225         case ACPI_TYPE_STRING:
226         case ACPI_TYPE_BUFFER:
227 
228             /*
229              * These types we will allow, but we will change the type.
230              * This enables some existing code of the form:
231              *
232              *  Name (DEB, 0)
233              *  Scope (DEB) { ... }
234              */
235             ACPI_WARNING ((AE_INFO,
236                 "Type override - [%4.4s] had invalid type (%s) "
237                 "for Scope operator, changed to type ANY",
238                 AcpiUtGetNodeName (Node), AcpiUtGetTypeName (Node->Type)));
239 
240             Node->Type = ACPI_TYPE_ANY;
241             WalkState->ScopeInfo->Common.Value = ACPI_TYPE_ANY;
242             break;
243 
244         case ACPI_TYPE_METHOD:
245 
246             /*
247              * Allow scope change to root during execution of module-level
248              * code. Root is typed METHOD during this time.
249              */
250             if ((Node == AcpiGbl_RootNode) &&
251                 (WalkState->ParseFlags & ACPI_PARSE_MODULE_LEVEL))
252             {
253                 break;
254             }
255 
256             /*lint -fallthrough */
257 
258         default:
259 
260             /* All other types are an error */
261 
262             ACPI_ERROR ((AE_INFO,
263                 "Invalid type (%s) for target of "
264                 "Scope operator [%4.4s] (Cannot override)",
265                 AcpiUtGetTypeName (Node->Type), AcpiUtGetNodeName (Node)));
266 
267             return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
268         }
269         break;
270 
271     default:
272 
273         /* All other opcodes */
274 
275         if (Op && Op->Common.Node)
276         {
277             /* This op/node was previously entered into the namespace */
278 
279             Node = Op->Common.Node;
280 
281             if (AcpiNsOpensScope (ObjectType))
282             {
283                 Status = AcpiDsScopeStackPush (Node, ObjectType, WalkState);
284                 if (ACPI_FAILURE (Status))
285                 {
286                     return_ACPI_STATUS (Status);
287                 }
288             }
289 
290             return_ACPI_STATUS (AE_OK);
291         }
292 
293         /*
294          * Enter the named type into the internal namespace. We enter the name
295          * as we go downward in the parse tree. Any necessary subobjects that
296          * involve arguments to the opcode must be created as we go back up the
297          * parse tree later.
298          *
299          * Note: Name may already exist if we are executing a deferred opcode.
300          */
301         if (WalkState->DeferredNode)
302         {
303             /* This name is already in the namespace, get the node */
304 
305             Node = WalkState->DeferredNode;
306             Status = AE_OK;
307             break;
308         }
309 
310         Flags = ACPI_NS_NO_UPSEARCH;
311         if (WalkState->PassNumber == ACPI_IMODE_EXECUTE)
312         {
313             /* Execution mode, node cannot already exist, node is temporary */
314 
315             Flags |= ACPI_NS_ERROR_IF_FOUND;
316 
317             if (!(WalkState->ParseFlags & ACPI_PARSE_MODULE_LEVEL))
318             {
319                 Flags |= ACPI_NS_TEMPORARY;
320             }
321         }
322 
323         /* Add new entry or lookup existing entry */
324 
325         Status = AcpiNsLookup (WalkState->ScopeInfo, BufferPtr, ObjectType,
326             ACPI_IMODE_LOAD_PASS2, Flags, WalkState, &Node);
327 
328         if (ACPI_SUCCESS (Status) && (Flags & ACPI_NS_TEMPORARY))
329         {
330             ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
331                 "***New Node [%4.4s] %p is temporary\n",
332                 AcpiUtGetNodeName (Node), Node));
333         }
334         break;
335     }
336 
337     if (ACPI_FAILURE (Status))
338     {
339         ACPI_ERROR_NAMESPACE (BufferPtr, Status);
340         return_ACPI_STATUS (Status);
341     }
342 
343     if (!Op)
344     {
345         /* Create a new op */
346 
347         Op = AcpiPsAllocOp (WalkState->Opcode, WalkState->Aml);
348         if (!Op)
349         {
350             return_ACPI_STATUS (AE_NO_MEMORY);
351         }
352 
353         /* Initialize the new op */
354 
355         if (Node)
356         {
357             Op->Named.Name = Node->Name.Integer;
358         }
359         *OutOp = Op;
360     }
361 
362     /*
363      * Put the Node in the "op" object that the parser uses, so we
364      * can get it again quickly when this scope is closed
365      */
366     Op->Common.Node = Node;
367     return_ACPI_STATUS (Status);
368 }
369 
370 
371 /*******************************************************************************
372  *
373  * FUNCTION:    AcpiDsLoad2EndOp
374  *
375  * PARAMETERS:  WalkState       - Current state of the parse tree walk
376  *
377  * RETURN:      Status
378  *
379  * DESCRIPTION: Ascending callback used during the loading of the namespace,
380  *              both control methods and everything else.
381  *
382  ******************************************************************************/
383 
384 ACPI_STATUS
385 AcpiDsLoad2EndOp (
386     ACPI_WALK_STATE         *WalkState)
387 {
388     ACPI_PARSE_OBJECT       *Op;
389     ACPI_STATUS             Status = AE_OK;
390     ACPI_OBJECT_TYPE        ObjectType;
391     ACPI_NAMESPACE_NODE     *Node;
392     ACPI_PARSE_OBJECT       *Arg;
393     ACPI_NAMESPACE_NODE     *NewNode;
394 #ifndef ACPI_NO_METHOD_EXECUTION
395     UINT32                  i;
396     UINT8                   RegionSpace;
397 #endif
398 
399 
400     ACPI_FUNCTION_TRACE (DsLoad2EndOp);
401 
402     Op = WalkState->Op;
403     ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
404         WalkState->OpInfo->Name, Op, WalkState));
405 
406     /* Check if opcode had an associated namespace object */
407 
408     if (!(WalkState->OpInfo->Flags & AML_NSOBJECT))
409     {
410         return_ACPI_STATUS (AE_OK);
411     }
412 
413     if (Op->Common.AmlOpcode == AML_SCOPE_OP)
414     {
415         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
416             "Ending scope Op=%p State=%p\n", Op, WalkState));
417     }
418 
419     ObjectType = WalkState->OpInfo->ObjectType;
420 
421     /*
422      * Get the Node/name from the earlier lookup
423      * (It was saved in the *op structure)
424      */
425     Node = Op->Common.Node;
426 
427     /*
428      * Put the Node on the object stack (Contains the ACPI Name of
429      * this object)
430      */
431     WalkState->Operands[0] = (void *) Node;
432     WalkState->NumOperands = 1;
433 
434     /* Pop the scope stack */
435 
436     if (AcpiNsOpensScope (ObjectType) &&
437        (Op->Common.AmlOpcode != AML_INT_METHODCALL_OP))
438     {
439         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "(%s) Popping scope for Op %p\n",
440             AcpiUtGetTypeName (ObjectType), Op));
441 
442         Status = AcpiDsScopeStackPop (WalkState);
443         if (ACPI_FAILURE (Status))
444         {
445             goto Cleanup;
446         }
447     }
448 
449     /*
450      * Named operations are as follows:
451      *
452      * AML_ALIAS
453      * AML_BANKFIELD
454      * AML_CREATEBITFIELD
455      * AML_CREATEBYTEFIELD
456      * AML_CREATEDWORDFIELD
457      * AML_CREATEFIELD
458      * AML_CREATEQWORDFIELD
459      * AML_CREATEWORDFIELD
460      * AML_DATA_REGION
461      * AML_DEVICE
462      * AML_EVENT
463      * AML_FIELD
464      * AML_INDEXFIELD
465      * AML_METHOD
466      * AML_METHODCALL
467      * AML_MUTEX
468      * AML_NAME
469      * AML_NAMEDFIELD
470      * AML_OPREGION
471      * AML_POWERRES
472      * AML_PROCESSOR
473      * AML_SCOPE
474      * AML_THERMALZONE
475      */
476 
477     ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
478         "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
479         AcpiPsGetOpcodeName (Op->Common.AmlOpcode), WalkState, Op, Node));
480 
481     /* Decode the opcode */
482 
483     Arg = Op->Common.Value.Arg;
484 
485     switch (WalkState->OpInfo->Type)
486     {
487 #ifndef ACPI_NO_METHOD_EXECUTION
488 
489     case AML_TYPE_CREATE_FIELD:
490         /*
491          * Create the field object, but the field buffer and index must
492          * be evaluated later during the execution phase
493          */
494         Status = AcpiDsCreateBufferField (Op, WalkState);
495         break;
496 
497      case AML_TYPE_NAMED_FIELD:
498         /*
499          * If we are executing a method, initialize the field
500          */
501         if (WalkState->MethodNode)
502         {
503             Status = AcpiDsInitFieldObjects (Op, WalkState);
504         }
505 
506         switch (Op->Common.AmlOpcode)
507         {
508         case AML_INDEX_FIELD_OP:
509 
510             Status = AcpiDsCreateIndexField (
511                 Op, (ACPI_HANDLE) Arg->Common.Node, WalkState);
512             break;
513 
514         case AML_BANK_FIELD_OP:
515 
516             Status = AcpiDsCreateBankField (Op, Arg->Common.Node, WalkState);
517             break;
518 
519         case AML_FIELD_OP:
520 
521             Status = AcpiDsCreateField (Op, Arg->Common.Node, WalkState);
522             break;
523 
524         default:
525 
526             /* All NAMED_FIELD opcodes must be handled above */
527             break;
528         }
529         break;
530 
531      case AML_TYPE_NAMED_SIMPLE:
532 
533         Status = AcpiDsCreateOperands (WalkState, Arg);
534         if (ACPI_FAILURE (Status))
535         {
536             goto Cleanup;
537         }
538 
539         switch (Op->Common.AmlOpcode)
540         {
541         case AML_PROCESSOR_OP:
542 
543             Status = AcpiExCreateProcessor (WalkState);
544             break;
545 
546         case AML_POWER_RES_OP:
547 
548             Status = AcpiExCreatePowerResource (WalkState);
549             break;
550 
551         case AML_MUTEX_OP:
552 
553             Status = AcpiExCreateMutex (WalkState);
554             break;
555 
556         case AML_EVENT_OP:
557 
558             Status = AcpiExCreateEvent (WalkState);
559             break;
560 
561         case AML_ALIAS_OP:
562 
563             Status = AcpiExCreateAlias (WalkState);
564             break;
565 
566         default:
567 
568             /* Unknown opcode */
569 
570             Status = AE_OK;
571             goto Cleanup;
572         }
573 
574         /* Delete operands */
575 
576         for (i = 1; i < WalkState->NumOperands; i++)
577         {
578             AcpiUtRemoveReference (WalkState->Operands[i]);
579             WalkState->Operands[i] = NULL;
580         }
581 
582         break;
583 #endif /* ACPI_NO_METHOD_EXECUTION */
584 
585     case AML_TYPE_NAMED_COMPLEX:
586 
587         switch (Op->Common.AmlOpcode)
588         {
589 #ifndef ACPI_NO_METHOD_EXECUTION
590         case AML_REGION_OP:
591         case AML_DATA_REGION_OP:
592 
593             if (Op->Common.AmlOpcode == AML_REGION_OP)
594             {
595                 RegionSpace = (ACPI_ADR_SPACE_TYPE)
596                     ((Op->Common.Value.Arg)->Common.Value.Integer);
597             }
598             else
599             {
600                 RegionSpace = ACPI_ADR_SPACE_DATA_TABLE;
601             }
602 
603             /*
604              * The OpRegion is not fully parsed at this time. The only valid
605              * argument is the SpaceId. (We must save the address of the
606              * AML of the address and length operands)
607              *
608              * If we have a valid region, initialize it. The namespace is
609              * unlocked at this point.
610              *
611              * Need to unlock interpreter if it is locked (if we are running
612              * a control method), in order to allow _REG methods to be run
613              * during AcpiEvInitializeRegion.
614              */
615             if (WalkState->MethodNode)
616             {
617                 /*
618                  * Executing a method: initialize the region and unlock
619                  * the interpreter
620                  */
621                 Status = AcpiExCreateRegion (Op->Named.Data,
622                     Op->Named.Length, RegionSpace, WalkState);
623                 if (ACPI_FAILURE (Status))
624                 {
625                     return_ACPI_STATUS (Status);
626                 }
627 
628                 AcpiExExitInterpreter ();
629             }
630 
631             Status = AcpiEvInitializeRegion (
632                 AcpiNsGetAttachedObject (Node), FALSE);
633             if (WalkState->MethodNode)
634             {
635                 AcpiExEnterInterpreter ();
636             }
637 
638             if (ACPI_FAILURE (Status))
639             {
640                 /*
641                  *  If AE_NOT_EXIST is returned, it is not fatal
642                  *  because many regions get created before a handler
643                  *  is installed for said region.
644                  */
645                 if (AE_NOT_EXIST == Status)
646                 {
647                     Status = AE_OK;
648                 }
649             }
650             break;
651 
652         case AML_NAME_OP:
653 
654             Status = AcpiDsCreateNode (WalkState, Node, Op);
655             break;
656 
657         case AML_METHOD_OP:
658             /*
659              * MethodOp PkgLength NameString MethodFlags TermList
660              *
661              * Note: We must create the method node/object pair as soon as we
662              * see the method declaration. This allows later pass1 parsing
663              * of invocations of the method (need to know the number of
664              * arguments.)
665              */
666             ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
667                 "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
668                 WalkState, Op, Op->Named.Node));
669 
670             if (!AcpiNsGetAttachedObject (Op->Named.Node))
671             {
672                 WalkState->Operands[0] = ACPI_CAST_PTR (void, Op->Named.Node);
673                 WalkState->NumOperands = 1;
674 
675                 Status = AcpiDsCreateOperands (
676                     WalkState, Op->Common.Value.Arg);
677                 if (ACPI_SUCCESS (Status))
678                 {
679                     Status = AcpiExCreateMethod (
680                         Op->Named.Data, Op->Named.Length, WalkState);
681                 }
682 
683                 WalkState->Operands[0] = NULL;
684                 WalkState->NumOperands = 0;
685 
686                 if (ACPI_FAILURE (Status))
687                 {
688                     return_ACPI_STATUS (Status);
689                 }
690             }
691             break;
692 
693 #endif /* ACPI_NO_METHOD_EXECUTION */
694 
695         default:
696 
697             /* All NAMED_COMPLEX opcodes must be handled above */
698             break;
699         }
700         break;
701 
702     case AML_CLASS_INTERNAL:
703 
704         /* case AML_INT_NAMEPATH_OP: */
705         break;
706 
707     case AML_CLASS_METHOD_CALL:
708 
709         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
710             "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
711             WalkState, Op, Node));
712 
713         /*
714          * Lookup the method name and save the Node
715          */
716         Status = AcpiNsLookup (WalkState->ScopeInfo, Arg->Common.Value.String,
717             ACPI_TYPE_ANY, ACPI_IMODE_LOAD_PASS2,
718             ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
719             WalkState, &(NewNode));
720         if (ACPI_SUCCESS (Status))
721         {
722             /*
723              * Make sure that what we found is indeed a method
724              * We didn't search for a method on purpose, to see if the name
725              * would resolve
726              */
727             if (NewNode->Type != ACPI_TYPE_METHOD)
728             {
729                 Status = AE_AML_OPERAND_TYPE;
730             }
731 
732             /* We could put the returned object (Node) on the object stack for
733              * later, but for now, we will put it in the "op" object that the
734              * parser uses, so we can get it again at the end of this scope
735              */
736             Op->Common.Node = NewNode;
737         }
738         else
739         {
740             ACPI_ERROR_NAMESPACE (Arg->Common.Value.String, Status);
741         }
742         break;
743 
744 
745     default:
746 
747         break;
748     }
749 
750 Cleanup:
751 
752     /* Remove the Node pushed at the very beginning */
753 
754     WalkState->Operands[0] = NULL;
755     WalkState->NumOperands = 0;
756     return_ACPI_STATUS (Status);
757 }
758