aboutsummaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/dswload2.c
blob: 976318138c56aa983f74f3786f4016040354d44c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
/******************************************************************************
 *
 * Module Name: dswload2 - Dispatcher second pass namespace load callbacks
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2011, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acevents.h"

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dswload2")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_load2_begin_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *              out_op          - Wher to return op if a new one is created
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 *
 ******************************************************************************/
acpi_status
acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
		       union acpi_parse_object **out_op)
{
	union acpi_parse_object *op;
	struct acpi_namespace_node *node;
	acpi_status status;
	acpi_object_type object_type;
	char *buffer_ptr;
	u32 flags;

	ACPI_FUNCTION_TRACE(ds_load2_begin_op);

	op = walk_state->op;
	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
			  walk_state));

	if (op) {
		if ((walk_state->control_state) &&
		    (walk_state->control_state->common.state ==
		     ACPI_CONTROL_CONDITIONAL_EXECUTING)) {

			/* We are executing a while loop outside of a method */

			status = acpi_ds_exec_begin_op(walk_state, out_op);
			return_ACPI_STATUS(status);
		}

		/* We only care about Namespace opcodes here */

		if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
		     (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
		    (!(walk_state->op_info->flags & AML_NAMED))) {
			return_ACPI_STATUS(AE_OK);
		}

		/* Get the name we are going to enter or lookup in the namespace */

		if (walk_state->opcode == AML_INT_NAMEPATH_OP) {

			/* For Namepath op, get the path string */

			buffer_ptr = op->common.value.string;
			if (!buffer_ptr) {

				/* No name, just exit */

				return_ACPI_STATUS(AE_OK);
			}
		} else {
			/* Get name from the op */

			buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
		}
	} else {
		/* Get the namestring from the raw AML */

		buffer_ptr =
		    acpi_ps_get_next_namestring(&walk_state->parser_state);
	}

	/* Map the opcode into an internal object type */

	object_type = walk_state->op_info->object_type;

	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
			  "State=%p Op=%p Type=%X\n", walk_state, op,
			  object_type));

	switch (walk_state->opcode) {
	case AML_FIELD_OP:
	case AML_BANK_FIELD_OP:
	case AML_INDEX_FIELD_OP:

		node = NULL;
		status = AE_OK;
		break;

	case AML_INT_NAMEPATH_OP:
		/*
		 * The name_path is an object reference to an existing object.
		 * Don't enter the name into the namespace, but look it up
		 * for use later.
		 */
		status =
		    acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
				   object_type, ACPI_IMODE_EXECUTE,
				   ACPI_NS_SEARCH_PARENT, walk_state, &(node));
		break;

	case AML_SCOPE_OP:

		/* Special case for Scope(\) -> refers to the Root node */

		if (op && (op->named.node == acpi_gbl_root_node)) {
			node = op->named.node;

			status =
			    acpi_ds_scope_stack_push(node, object_type,
						     walk_state);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		} else {
			/*
			 * The Path is an object reference to an existing object.
			 * Don't enter the name into the namespace, but look it up
			 * for use later.
			 */
			status =
			    acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
					   object_type, ACPI_IMODE_EXECUTE,
					   ACPI_NS_SEARCH_PARENT, walk_state,
					   &(node));
			if (ACPI_FAILURE(status)) {
#ifdef ACPI_ASL_COMPILER
				if (status == AE_NOT_FOUND) {
					status = AE_OK;
				} else {
					ACPI_ERROR_NAMESPACE(buffer_ptr,
							     status);
				}
#else
				ACPI_ERROR_NAMESPACE(buffer_ptr, status);
#endif
				return_ACPI_STATUS(status);
			}
		}

		/*
		 * We must check to make sure that the target is
		 * one of the opcodes that actually opens a scope
		 */
		switch (node->type) {
		case ACPI_TYPE_ANY:
		case ACPI_TYPE_LOCAL_SCOPE:	/* Scope */
		case ACPI_TYPE_DEVICE:
		case ACPI_TYPE_POWER:
		case ACPI_TYPE_PROCESSOR:
		case ACPI_TYPE_THERMAL:

			/* These are acceptable types */
			break;

		case ACPI_TYPE_INTEGER:
		case ACPI_TYPE_STRING:
		case ACPI_TYPE_BUFFER:

			/*
			 * These types we will allow, but we will change the type.
			 * This enables some existing code of the form:
			 *
			 *  Name (DEB, 0)
			 *  Scope (DEB) { ... }
			 */
			ACPI_WARNING((AE_INFO,
				      "Type override - [%4.4s] had invalid type (%s) "
				      "for Scope operator, changed to type ANY\n",
				      acpi_ut_get_node_name(node),
				      acpi_ut_get_type_name(node->type)));

			node->type = ACPI_TYPE_ANY;
			walk_state->scope_info->common.value = ACPI_TYPE_ANY;
			break;

		default:

			/* All other types are an error */

			ACPI_ERROR((AE_INFO,
				    "Invalid type (%s) for target of "
				    "Scope operator [%4.4s] (Cannot override)",
				    acpi_ut_get_type_name(node->type),
				    acpi_ut_get_node_name(node)));

			return (AE_AML_OPERAND_TYPE);
		}
		break;

	default:

		/* All other opcodes */

		if (op && op->common.node) {

			/* This op/node was previously entered into the namespace */

			node = op->common.node;

			if (acpi_ns_opens_scope(object_type)) {
				status =
				    acpi_ds_scope_stack_push(node, object_type,
							     walk_state);
				if (ACPI_FAILURE(status)) {
					return_ACPI_STATUS(status);
				}
			}

			return_ACPI_STATUS(AE_OK);
		}

		/*
		 * Enter the named type into the internal namespace. We enter the name
		 * as we go downward in the parse tree. Any necessary subobjects that
		 * involve arguments to the opcode must be created as we go back up the
		 * parse tree later.
		 *
		 * Note: Name may already exist if we are executing a deferred opcode.
		 */
		if (walk_state->deferred_node) {

			/* This name is already in the namespace, get the node */

			node = walk_state->deferred_node;
			status = AE_OK;
			break;
		}

		flags = ACPI_NS_NO_UPSEARCH;
		if (walk_state->pass_number == ACPI_IMODE_EXECUTE) {

			/* Execution mode, node cannot already exist, node is temporary */

			flags |= ACPI_NS_ERROR_IF_FOUND;

			if (!
			    (walk_state->
			     parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
				flags |= ACPI_NS_TEMPORARY;
			}
		}

		/* Add new entry or lookup existing entry */

		status =
		    acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
				   object_type, ACPI_IMODE_LOAD_PASS2, flags,
				   walk_state, &node);

		if (ACPI_SUCCESS(status) && (flags & ACPI_NS_TEMPORARY)) {
			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
					  "***New Node [%4.4s] %p is temporary\n",
					  acpi_ut_get_node_name(node), node));
		}
		break;
	}

	if (ACPI_FAILURE(status)) {
		ACPI_ERROR_NAMESPACE(buffer_ptr, status);
		return_ACPI_STATUS(status);
	}

	if (!op) {

		/* Create a new op */

		op = acpi_ps_alloc_op(walk_state->opcode);
		if (!op) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		/* Initialize the new op */

		if (node) {
			op->named.name = node->name.integer;
		}
		*out_op = op;
	}

	/*
	 * Put the Node in the "op" object that the parser uses, so we
	 * can get it again quickly when this scope is closed
	 */
	op->common.node = node;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_load2_end_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Ascending callback used during the loading of the namespace,
 *              both control methods and everything else.
 *
 ******************************************************************************/

acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
{
	union acpi_parse_object *op;
	acpi_status status = AE_OK;
	acpi_object_type object_type;
	struct acpi_namespace_node *node;
	union acpi_parse_object *arg;
	struct acpi_namespace_node *new_node;
#ifndef ACPI_NO_METHOD_EXECUTION
	u32 i;
	u8 region_space;
#endif

	ACPI_FUNCTION_TRACE(ds_load2_end_op);

	op = walk_state->op;
	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
			  walk_state->op_info->name, op, walk_state));

	/* Check if opcode had an associated namespace object */

	if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
		return_ACPI_STATUS(AE_OK);
	}

	if (op->common.aml_opcode == AML_SCOPE_OP) {
		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
				  "Ending scope Op=%p State=%p\n", op,
				  walk_state));
	}

	object_type = walk_state->op_info->object_type;

	/*
	 * Get the Node/name from the earlier lookup
	 * (It was saved in the *op structure)
	 */
	node = op->common.node;

	/*
	 * Put the Node on the object stack (Contains the ACPI Name of
	 * this object)
	 */
	walk_state->operands[0] = (void *)node;
	walk_state->num_operands = 1;

	/* Pop the scope stack */

	if (acpi_ns_opens_scope(object_type) &&
	    (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
				  "(%s) Popping scope for Op %p\n",
				  acpi_ut_get_type_name(object_type), op));

		status = acpi_ds_scope_stack_pop(walk_state);
		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}
	}

	/*
	 * Named operations are as follows:
	 *
	 * AML_ALIAS
	 * AML_BANKFIELD
	 * AML_CREATEBITFIELD
	 * AML_CREATEBYTEFIELD
	 * AML_CREATEDWORDFIELD
	 * AML_CREATEFIELD
	 * AML_CREATEQWORDFIELD
	 * AML_CREATEWORDFIELD
	 * AML_DATA_REGION
	 * AML_DEVICE
	 * AML_EVENT
	 * AML_FIELD
	 * AML_INDEXFIELD
	 * AML_METHOD
	 * AML_METHODCALL
	 * AML_MUTEX
	 * AML_NAME
	 * AML_NAMEDFIELD
	 * AML_OPREGION
	 * AML_POWERRES
	 * AML_PROCESSOR
	 * AML_SCOPE
	 * AML_THERMALZONE
	 */

	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
			  "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
			  acpi_ps_get_opcode_name(op->common.aml_opcode),
			  walk_state, op, node));

	/* Decode the opcode */

	arg = op->common.value.arg;

	switch (walk_state->op_info->type) {
#ifndef ACPI_NO_METHOD_EXECUTION

	case AML_TYPE_CREATE_FIELD:
		/*
		 * Create the field object, but the field buffer and index must
		 * be evaluated later during the execution phase
		 */
		status = acpi_ds_create_buffer_field(op, walk_state);
		break;

	case AML_TYPE_NAMED_FIELD:
		/*
		 * If we are executing a method, initialize the field
		 */
		if (walk_state->method_node) {
			status = acpi_ds_init_field_objects(op, walk_state);
		}

		switch (op->common.aml_opcode) {
		case AML_INDEX_FIELD_OP:

			status =
			    acpi_ds_create_index_field(op,
						       (acpi_handle) arg->
						       common.node, walk_state);
			break;

		case AML_BANK_FIELD_OP:

			status =
			    acpi_ds_create_bank_field(op, arg->common.node,
						      walk_state);
			break;

		case AML_FIELD_OP:

			status =
			    acpi_ds_create_field(op, arg->common.node,
						 walk_state);
			break;

		default:
			/* All NAMED_FIELD opcodes must be handled above */
			break;
		}
		break;

	case AML_TYPE_NAMED_SIMPLE:

		status = acpi_ds_create_operands(walk_state, arg);
		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}

		switch (op->common.aml_opcode) {
		case AML_PROCESSOR_OP:

			status = acpi_ex_create_processor(walk_state);
			break;

		case AML_POWER_RES_OP:

			status = acpi_ex_create_power_resource(walk_state);
			break;

		case AML_MUTEX_OP:

			status = acpi_ex_create_mutex(walk_state);
			break;

		case AML_EVENT_OP:

			status = acpi_ex_create_event(walk_state);
			break;

		case AML_ALIAS_OP:

			status = acpi_ex_create_alias(walk_state);
			break;

		default:
			/* Unknown opcode */

			status = AE_OK;
			goto cleanup;
		}

		/* Delete operands */

		for (i = 1; i < walk_state->num_operands; i++) {
			acpi_ut_remove_reference(walk_state->operands[i]);
			walk_state->operands[i] = NULL;
		}

		break;
#endif				/* ACPI_NO_METHOD_EXECUTION */

	case AML_TYPE_NAMED_COMPLEX:

		switch (op->common.aml_opcode) {
#ifndef ACPI_NO_METHOD_EXECUTION
		case AML_REGION_OP:
		case AML_DATA_REGION_OP:

			if (op->common.aml_opcode == AML_REGION_OP) {
				region_space = (acpi_adr_space_type)
				    ((op->common.value.arg)->common.value.
				     integer);
			} else {
				region_space = ACPI_ADR_SPACE_DATA_TABLE;
			}

			/*
			 * The op_region is not fully parsed at this time. The only valid
			 * argument is the space_id. (We must save the address of the
			 * AML of the address and length operands)
			 *
			 * If we have a valid region, initialize it. The namespace is
			 * unlocked at this point.
			 *
			 * Need to unlock interpreter if it is locked (if we are running
			 * a control method), in order to allow _REG methods to be run
			 * during acpi_ev_initialize_region.
			 */
			if (walk_state->method_node) {
				/*
				 * Executing a method: initialize the region and unlock
				 * the interpreter
				 */
				status =
				    acpi_ex_create_region(op->named.data,
							  op->named.length,
							  region_space,
							  walk_state);
				if (ACPI_FAILURE(status)) {
					return (status);
				}

				acpi_ex_exit_interpreter();
			}

			status =
			    acpi_ev_initialize_region
			    (acpi_ns_get_attached_object(node), FALSE);
			if (walk_state->method_node) {
				acpi_ex_enter_interpreter();
			}

			if (ACPI_FAILURE(status)) {
				/*
				 *  If AE_NOT_EXIST is returned, it is not fatal
				 *  because many regions get created before a handler
				 *  is installed for said region.
				 */
				if (AE_NOT_EXIST == status) {
					status = AE_OK;
				}
			}
			break;

		case AML_NAME_OP:

			status = acpi_ds_create_node(walk_state, node, op);
			break;

		case AML_METHOD_OP:
			/*
			 * method_op pkg_length name_string method_flags term_list
			 *
			 * Note: We must create the method node/object pair as soon as we
			 * see the method declaration. This allows later pass1 parsing
			 * of invocations of the method (need to know the number of
			 * arguments.)
			 */
			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
					  "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
					  walk_state, op, op->named.node));

			if (!acpi_ns_get_attached_object(op->named.node)) {
				walk_state->operands[0] =
				    ACPI_CAST_PTR(void, op->named.node);
				walk_state->num_operands = 1;

				status =
				    acpi_ds_create_operands(walk_state,
							    op->common.value.
							    arg);
				if (ACPI_SUCCESS(status)) {
					status =
					    acpi_ex_create_method(op->named.
								  data,
								  op->named.
								  length,
								  walk_state);
				}
				walk_state->operands[0] = NULL;
				walk_state->num_operands = 0;

				if (ACPI_FAILURE(status)) {
					return_ACPI_STATUS(status);
				}
			}
			break;

#endif				/* ACPI_NO_METHOD_EXECUTION */

		default:
			/* All NAMED_COMPLEX opcodes must be handled above */
			break;
		}
		break;

	case AML_CLASS_INTERNAL:

		/* case AML_INT_NAMEPATH_OP: */
		break;

	case AML_CLASS_METHOD_CALL:

		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
				  "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
				  walk_state, op, node));

		/*
		 * Lookup the method name and save the Node
		 */
		status =
		    acpi_ns_lookup(walk_state->scope_info,
				   arg->common.value.string, ACPI_TYPE_ANY,
				   ACPI_IMODE_LOAD_PASS2,
				   ACPI_NS_SEARCH_PARENT |
				   ACPI_NS_DONT_OPEN_SCOPE, walk_state,
				   &(new_node));
		if (ACPI_SUCCESS(status)) {
			/*
			 * Make sure that what we found is indeed a method
			 * We didn't search for a method on purpose, to see if the name
			 * would resolve
			 */
			if (new_node->type != ACPI_TYPE_METHOD) {
				status = AE_AML_OPERAND_TYPE;
			}

			/* We could put the returned object (Node) on the object stack for
			 * later, but for now, we will put it in the "op" object that the
			 * parser uses, so we can get it again at the end of this scope
			 */
			op->common.node = new_node;
		} else {
			ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
		}
		break;

	default:
		break;
	}

      cleanup:

	/* Remove the Node pushed at the very beginning */

	walk_state->operands[0] = NULL;
	walk_state->num_operands = 0;
	return_ACPI_STATUS(status);
}