PageRenderTime 67ms CodeModel.GetById 9ms app.highlight 52ms RepoModel.GetById 1ms app.codeStats 0ms

/drivers/acpi/acpica/dswexec.c

http://github.com/mirrors/linux
C | 760 lines | 452 code | 134 blank | 174 comment | 80 complexity | e47df42fa32f35e934311ad810da665f MD5 | raw file
  1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
  2/******************************************************************************
  3 *
  4 * Module Name: dswexec - Dispatcher method execution callbacks;
  5 *                        dispatch to interpreter.
  6 *
  7 * Copyright (C) 2000 - 2020, Intel Corp.
  8 *
  9 *****************************************************************************/
 10
 11#include <acpi/acpi.h>
 12#include "accommon.h"
 13#include "acparser.h"
 14#include "amlcode.h"
 15#include "acdispat.h"
 16#include "acinterp.h"
 17#include "acnamesp.h"
 18#include "acdebug.h"
 19#ifdef ACPI_EXEC_APP
 20#include "aecommon.h"
 21#endif
 22
 23#define _COMPONENT          ACPI_DISPATCHER
 24ACPI_MODULE_NAME("dswexec")
 25
 26/*
 27 * Dispatch table for opcode classes
 28 */
 29static acpi_execute_op acpi_gbl_op_type_dispatch[] = {
 30	acpi_ex_opcode_0A_0T_1R,
 31	acpi_ex_opcode_1A_0T_0R,
 32	acpi_ex_opcode_1A_0T_1R,
 33	acpi_ex_opcode_1A_1T_0R,
 34	acpi_ex_opcode_1A_1T_1R,
 35	acpi_ex_opcode_2A_0T_0R,
 36	acpi_ex_opcode_2A_0T_1R,
 37	acpi_ex_opcode_2A_1T_1R,
 38	acpi_ex_opcode_2A_2T_1R,
 39	acpi_ex_opcode_3A_0T_0R,
 40	acpi_ex_opcode_3A_1T_1R,
 41	acpi_ex_opcode_6A_0T_1R
 42};
 43
 44/*****************************************************************************
 45 *
 46 * FUNCTION:    acpi_ds_get_predicate_value
 47 *
 48 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 49 *              result_obj      - if non-zero, pop result from result stack
 50 *
 51 * RETURN:      Status
 52 *
 53 * DESCRIPTION: Get the result of a predicate evaluation
 54 *
 55 ****************************************************************************/
 56
 57acpi_status
 58acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
 59			    union acpi_operand_object *result_obj)
 60{
 61	acpi_status status = AE_OK;
 62	union acpi_operand_object *obj_desc;
 63	union acpi_operand_object *local_obj_desc = NULL;
 64
 65	ACPI_FUNCTION_TRACE_PTR(ds_get_predicate_value, walk_state);
 66
 67	walk_state->control_state->common.state = 0;
 68
 69	if (result_obj) {
 70		status = acpi_ds_result_pop(&obj_desc, walk_state);
 71		if (ACPI_FAILURE(status)) {
 72			ACPI_EXCEPTION((AE_INFO, status,
 73					"Could not get result from predicate evaluation"));
 74
 75			return_ACPI_STATUS(status);
 76		}
 77	} else {
 78		status = acpi_ds_create_operand(walk_state, walk_state->op, 0);
 79		if (ACPI_FAILURE(status)) {
 80			return_ACPI_STATUS(status);
 81		}
 82
 83		status =
 84		    acpi_ex_resolve_to_value(&walk_state->operands[0],
 85					     walk_state);
 86		if (ACPI_FAILURE(status)) {
 87			return_ACPI_STATUS(status);
 88		}
 89
 90		obj_desc = walk_state->operands[0];
 91	}
 92
 93	if (!obj_desc) {
 94		ACPI_ERROR((AE_INFO,
 95			    "No predicate ObjDesc=%p State=%p",
 96			    obj_desc, walk_state));
 97
 98		return_ACPI_STATUS(AE_AML_NO_OPERAND);
 99	}
100
101	/*
102	 * Result of predicate evaluation must be an Integer
103	 * object. Implicitly convert the argument if necessary.
104	 */
105	status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc,
106					    ACPI_IMPLICIT_CONVERSION);
107	if (ACPI_FAILURE(status)) {
108		goto cleanup;
109	}
110
111	if (local_obj_desc->common.type != ACPI_TYPE_INTEGER) {
112		ACPI_ERROR((AE_INFO,
113			    "Bad predicate (not an integer) ObjDesc=%p State=%p Type=0x%X",
114			    obj_desc, walk_state, obj_desc->common.type));
115
116		status = AE_AML_OPERAND_TYPE;
117		goto cleanup;
118	}
119
120	/* Truncate the predicate to 32-bits if necessary */
121
122	(void)acpi_ex_truncate_for32bit_table(local_obj_desc);
123
124	/*
125	 * Save the result of the predicate evaluation on
126	 * the control stack
127	 */
128	if (local_obj_desc->integer.value) {
129		walk_state->control_state->common.value = TRUE;
130	} else {
131		/*
132		 * Predicate is FALSE, we will just toss the
133		 * rest of the package
134		 */
135		walk_state->control_state->common.value = FALSE;
136		status = AE_CTRL_FALSE;
137	}
138
139	/* Predicate can be used for an implicit return value */
140
141	(void)acpi_ds_do_implicit_return(local_obj_desc, walk_state, TRUE);
142
143cleanup:
144
145	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
146			  "Completed a predicate eval=%X Op=%p\n",
147			  walk_state->control_state->common.value,
148			  walk_state->op));
149
150	/* Break to debugger to display result */
151
152	acpi_db_display_result_object(local_obj_desc, walk_state);
153
154	/*
155	 * Delete the predicate result object (we know that
156	 * we don't need it anymore)
157	 */
158	if (local_obj_desc != obj_desc) {
159		acpi_ut_remove_reference(local_obj_desc);
160	}
161	acpi_ut_remove_reference(obj_desc);
162
163	walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
164	return_ACPI_STATUS(status);
165}
166
167/*****************************************************************************
168 *
169 * FUNCTION:    acpi_ds_exec_begin_op
170 *
171 * PARAMETERS:  walk_state      - Current state of the parse tree walk
172 *              out_op          - Where to return op if a new one is created
173 *
174 * RETURN:      Status
175 *
176 * DESCRIPTION: Descending callback used during the execution of control
177 *              methods. This is where most operators and operands are
178 *              dispatched to the interpreter.
179 *
180 ****************************************************************************/
181
182acpi_status
183acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
184		      union acpi_parse_object **out_op)
185{
186	union acpi_parse_object *op;
187	acpi_status status = AE_OK;
188	u32 opcode_class;
189
190	ACPI_FUNCTION_TRACE_PTR(ds_exec_begin_op, walk_state);
191
192	op = walk_state->op;
193	if (!op) {
194		status = acpi_ds_load2_begin_op(walk_state, out_op);
195		if (ACPI_FAILURE(status)) {
196			goto error_exit;
197		}
198
199		op = *out_op;
200		walk_state->op = op;
201		walk_state->opcode = op->common.aml_opcode;
202		walk_state->op_info =
203		    acpi_ps_get_opcode_info(op->common.aml_opcode);
204
205		if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
206			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
207					  "(%s) Popping scope for Op %p\n",
208					  acpi_ut_get_type_name(walk_state->
209								op_info->
210								object_type),
211					  op));
212
213			status = acpi_ds_scope_stack_pop(walk_state);
214			if (ACPI_FAILURE(status)) {
215				goto error_exit;
216			}
217		}
218	}
219
220	if (op == walk_state->origin) {
221		if (out_op) {
222			*out_op = op;
223		}
224
225		return_ACPI_STATUS(AE_OK);
226	}
227
228	/*
229	 * If the previous opcode was a conditional, this opcode
230	 * must be the beginning of the associated predicate.
231	 * Save this knowledge in the current scope descriptor
232	 */
233	if ((walk_state->control_state) &&
234	    (walk_state->control_state->common.state ==
235	     ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
236		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
237				  "Exec predicate Op=%p State=%p\n",
238				  op, walk_state));
239
240		walk_state->control_state->common.state =
241		    ACPI_CONTROL_PREDICATE_EXECUTING;
242
243		/* Save start of predicate */
244
245		walk_state->control_state->control.predicate_op = op;
246	}
247
248	opcode_class = walk_state->op_info->class;
249
250	/* We want to send namepaths to the load code */
251
252	if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
253		opcode_class = AML_CLASS_NAMED_OBJECT;
254	}
255
256	/*
257	 * Handle the opcode based upon the opcode type
258	 */
259	switch (opcode_class) {
260	case AML_CLASS_CONTROL:
261
262		status = acpi_ds_exec_begin_control_op(walk_state, op);
263		break;
264
265	case AML_CLASS_NAMED_OBJECT:
266
267		if (walk_state->walk_type & ACPI_WALK_METHOD) {
268			/*
269			 * Found a named object declaration during method execution;
270			 * we must enter this object into the namespace. The created
271			 * object is temporary and will be deleted upon completion of
272			 * the execution of this method.
273			 *
274			 * Note 10/2010: Except for the Scope() op. This opcode does
275			 * not actually create a new object, it refers to an existing
276			 * object. However, for Scope(), we want to indeed open a
277			 * new scope.
278			 */
279			if (op->common.aml_opcode != AML_SCOPE_OP) {
280				status =
281				    acpi_ds_load2_begin_op(walk_state, NULL);
282			} else {
283				status =
284				    acpi_ds_scope_stack_push(op->named.node,
285							     op->named.node->
286							     type, walk_state);
287				if (ACPI_FAILURE(status)) {
288					return_ACPI_STATUS(status);
289				}
290			}
291		}
292		break;
293
294	case AML_CLASS_EXECUTE:
295	case AML_CLASS_CREATE:
296
297		break;
298
299	default:
300
301		break;
302	}
303
304	/* Nothing to do here during method execution */
305
306	return_ACPI_STATUS(status);
307
308error_exit:
309	status = acpi_ds_method_error(status, walk_state);
310	return_ACPI_STATUS(status);
311}
312
313/*****************************************************************************
314 *
315 * FUNCTION:    acpi_ds_exec_end_op
316 *
317 * PARAMETERS:  walk_state      - Current state of the parse tree walk
318 *
319 * RETURN:      Status
320 *
321 * DESCRIPTION: Ascending callback used during the execution of control
322 *              methods. The only thing we really need to do here is to
323 *              notice the beginning of IF, ELSE, and WHILE blocks.
324 *
325 ****************************************************************************/
326
327acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
328{
329	union acpi_parse_object *op;
330	acpi_status status = AE_OK;
331	u32 op_type;
332	u32 op_class;
333	union acpi_parse_object *next_op;
334	union acpi_parse_object *first_arg;
335#ifdef ACPI_EXEC_APP
336	char *namepath;
337	union acpi_operand_object *obj_desc;
338#endif
339
340	ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);
341
342	op = walk_state->op;
343	op_type = walk_state->op_info->type;
344	op_class = walk_state->op_info->class;
345
346	if (op_class == AML_CLASS_UNKNOWN) {
347		ACPI_ERROR((AE_INFO, "Unknown opcode 0x%X",
348			    op->common.aml_opcode));
349		return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
350	}
351
352	first_arg = op->common.value.arg;
353
354	/* Init the walk state */
355
356	walk_state->num_operands = 0;
357	walk_state->operand_index = 0;
358	walk_state->return_desc = NULL;
359	walk_state->result_obj = NULL;
360
361	/* Call debugger for single step support (DEBUG build only) */
362
363	status = acpi_db_single_step(walk_state, op, op_class);
364	if (ACPI_FAILURE(status)) {
365		return_ACPI_STATUS(status);
366	}
367
368	/* Decode the Opcode Class */
369
370	switch (op_class) {
371	case AML_CLASS_ARGUMENT:	/* Constants, literals, etc. */
372
373		if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
374			status = acpi_ds_evaluate_name_path(walk_state);
375			if (ACPI_FAILURE(status)) {
376				goto cleanup;
377			}
378		}
379		break;
380
381	case AML_CLASS_EXECUTE:	/* Most operators with arguments */
382
383		/* Build resolved operand stack */
384
385		status = acpi_ds_create_operands(walk_state, first_arg);
386		if (ACPI_FAILURE(status)) {
387			goto cleanup;
388		}
389
390		/*
391		 * All opcodes require operand resolution, with the only exceptions
392		 * being the object_type and size_of operators.
393		 */
394		if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
395
396			/* Resolve all operands */
397
398			status = acpi_ex_resolve_operands(walk_state->opcode,
399							  &(walk_state->
400							    operands
401							    [walk_state->
402							     num_operands - 1]),
403							  walk_state);
404		}
405
406		if (ACPI_SUCCESS(status)) {
407			/*
408			 * Dispatch the request to the appropriate interpreter handler
409			 * routine. There is one routine per opcode "type" based upon the
410			 * number of opcode arguments and return type.
411			 */
412			status =
413			    acpi_gbl_op_type_dispatch[op_type] (walk_state);
414		} else {
415			/*
416			 * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
417			 * Local is uninitialized.
418			 */
419			if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
420			    (walk_state->opcode == AML_STORE_OP) &&
421			    (walk_state->operands[0]->common.type ==
422			     ACPI_TYPE_LOCAL_REFERENCE)
423			    && (walk_state->operands[1]->common.type ==
424				ACPI_TYPE_LOCAL_REFERENCE)
425			    && (walk_state->operands[0]->reference.class ==
426				walk_state->operands[1]->reference.class)
427			    && (walk_state->operands[0]->reference.value ==
428				walk_state->operands[1]->reference.value)) {
429				status = AE_OK;
430			} else {
431				ACPI_EXCEPTION((AE_INFO, status,
432						"While resolving operands for [%s]",
433						acpi_ps_get_opcode_name
434						(walk_state->opcode)));
435			}
436		}
437
438		/* Always delete the argument objects and clear the operand stack */
439
440		acpi_ds_clear_operands(walk_state);
441
442		/*
443		 * If a result object was returned from above, push it on the
444		 * current result stack
445		 */
446		if (ACPI_SUCCESS(status) && walk_state->result_obj) {
447			status =
448			    acpi_ds_result_push(walk_state->result_obj,
449						walk_state);
450		}
451		break;
452
453	default:
454
455		switch (op_type) {
456		case AML_TYPE_CONTROL:	/* Type 1 opcode, IF/ELSE/WHILE/NOOP */
457
458			/* 1 Operand, 0 external_result, 0 internal_result */
459
460			status = acpi_ds_exec_end_control_op(walk_state, op);
461
462			break;
463
464		case AML_TYPE_METHOD_CALL:
465			/*
466			 * If the method is referenced from within a package
467			 * declaration, it is not a invocation of the method, just
468			 * a reference to it.
469			 */
470			if ((op->asl.parent) &&
471			    ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
472			     || (op->asl.parent->asl.aml_opcode ==
473				 AML_VARIABLE_PACKAGE_OP))) {
474				ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
475						  "Method Reference in a Package, Op=%p\n",
476						  op));
477
478				op->common.node = (struct acpi_namespace_node *)
479				    op->asl.value.arg->asl.node;
480				acpi_ut_add_reference(op->asl.value.arg->asl.
481						      node->object);
482				return_ACPI_STATUS(AE_OK);
483			}
484
485			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
486					  "Method invocation, Op=%p\n", op));
487
488			/*
489			 * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
490			 * the method Node pointer
491			 */
492			/* next_op points to the op that holds the method name */
493
494			next_op = first_arg;
495
496			/* next_op points to first argument op */
497
498			next_op = next_op->common.next;
499
500			/*
501			 * Get the method's arguments and put them on the operand stack
502			 */
503			status = acpi_ds_create_operands(walk_state, next_op);
504			if (ACPI_FAILURE(status)) {
505				break;
506			}
507
508			/*
509			 * Since the operands will be passed to another control method,
510			 * we must resolve all local references here (Local variables,
511			 * arguments to *this* method, etc.)
512			 */
513			status = acpi_ds_resolve_operands(walk_state);
514			if (ACPI_FAILURE(status)) {
515
516				/* On error, clear all resolved operands */
517
518				acpi_ds_clear_operands(walk_state);
519				break;
520			}
521
522			/*
523			 * Tell the walk loop to preempt this running method and
524			 * execute the new method
525			 */
526			status = AE_CTRL_TRANSFER;
527
528			/*
529			 * Return now; we don't want to disturb anything,
530			 * especially the operand count!
531			 */
532			return_ACPI_STATUS(status);
533
534		case AML_TYPE_CREATE_FIELD:
535
536			ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
537					  "Executing CreateField Buffer/Index Op=%p\n",
538					  op));
539
540			status = acpi_ds_load2_end_op(walk_state);
541			if (ACPI_FAILURE(status)) {
542				break;
543			}
544
545			status =
546			    acpi_ds_eval_buffer_field_operands(walk_state, op);
547			if (ACPI_FAILURE(status)) {
548				break;
549			}
550#ifdef ACPI_EXEC_APP
551			/*
552			 * acpi_exec support for namespace initialization file (initialize
553			 * buffer_fields in this code.)
554			 */
555			namepath =
556			    acpi_ns_get_external_pathname(op->common.node);
557			status = ae_lookup_init_file_entry(namepath, &obj_desc);
558			if (ACPI_SUCCESS(status)) {
559				status =
560				    acpi_ex_write_data_to_field(obj_desc,
561								op->common.
562								node->object,
563								NULL);
564				if ACPI_FAILURE
565					(status) {
566					ACPI_EXCEPTION((AE_INFO, status,
567							"While writing to buffer field"));
568					}
569			}
570			ACPI_FREE(namepath);
571			status = AE_OK;
572#endif
573			break;
574
575		case AML_TYPE_CREATE_OBJECT:
576
577			ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
578					  "Executing CreateObject (Buffer/Package) Op=%p Child=%p ParentOpcode=%4.4X\n",
579					  op, op->named.value.arg,
580					  op->common.parent->common.
581					  aml_opcode));
582
583			switch (op->common.parent->common.aml_opcode) {
584			case AML_NAME_OP:
585				/*
586				 * Put the Node on the object stack (Contains the ACPI Name
587				 * of this object)
588				 */
589				walk_state->operands[0] = (void *)
590				    op->common.parent->common.node;
591				walk_state->num_operands = 1;
592
593				status = acpi_ds_create_node(walk_state,
594							     op->common.parent->
595							     common.node,
596							     op->common.parent);
597				if (ACPI_FAILURE(status)) {
598					break;
599				}
600
601				/* Fall through */
602				/*lint -fallthrough */
603
604			case AML_INT_EVAL_SUBTREE_OP:
605
606				status =
607				    acpi_ds_eval_data_object_operands
608				    (walk_state, op,
609				     acpi_ns_get_attached_object(op->common.
610								 parent->common.
611								 node));
612				break;
613
614			default:
615
616				status =
617				    acpi_ds_eval_data_object_operands
618				    (walk_state, op, NULL);
619				break;
620			}
621
622			/*
623			 * If a result object was returned from above, push it on the
624			 * current result stack
625			 */
626			if (walk_state->result_obj) {
627				status =
628				    acpi_ds_result_push(walk_state->result_obj,
629							walk_state);
630			}
631			break;
632
633		case AML_TYPE_NAMED_FIELD:
634		case AML_TYPE_NAMED_COMPLEX:
635		case AML_TYPE_NAMED_SIMPLE:
636		case AML_TYPE_NAMED_NO_OBJ:
637
638			status = acpi_ds_load2_end_op(walk_state);
639			if (ACPI_FAILURE(status)) {
640				break;
641			}
642
643			if (op->common.aml_opcode == AML_REGION_OP) {
644				ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
645						  "Executing OpRegion Address/Length Op=%p\n",
646						  op));
647
648				status =
649				    acpi_ds_eval_region_operands(walk_state,
650								 op);
651				if (ACPI_FAILURE(status)) {
652					break;
653				}
654			} else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
655				ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
656						  "Executing DataTableRegion Strings Op=%p\n",
657						  op));
658
659				status =
660				    acpi_ds_eval_table_region_operands
661				    (walk_state, op);
662				if (ACPI_FAILURE(status)) {
663					break;
664				}
665			} else if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
666				ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
667						  "Executing BankField Op=%p\n",
668						  op));
669
670				status =
671				    acpi_ds_eval_bank_field_operands(walk_state,
672								     op);
673				if (ACPI_FAILURE(status)) {
674					break;
675				}
676			}
677			break;
678
679		case AML_TYPE_UNDEFINED:
680
681			ACPI_ERROR((AE_INFO,
682				    "Undefined opcode type Op=%p", op));
683			return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
684
685		case AML_TYPE_BOGUS:
686
687			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
688					  "Internal opcode=%X type Op=%p\n",
689					  walk_state->opcode, op));
690			break;
691
692		default:
693
694			ACPI_ERROR((AE_INFO,
695				    "Unimplemented opcode, class=0x%X "
696				    "type=0x%X Opcode=0x%X Op=%p",
697				    op_class, op_type, op->common.aml_opcode,
698				    op));
699
700			status = AE_NOT_IMPLEMENTED;
701			break;
702		}
703	}
704
705	/*
706	 * ACPI 2.0 support for 64-bit integers: Truncate numeric
707	 * result value if we are executing from a 32-bit ACPI table
708	 */
709	(void)acpi_ex_truncate_for32bit_table(walk_state->result_obj);
710
711	/*
712	 * Check if we just completed the evaluation of a
713	 * conditional predicate
714	 */
715	if ((ACPI_SUCCESS(status)) &&
716	    (walk_state->control_state) &&
717	    (walk_state->control_state->common.state ==
718	     ACPI_CONTROL_PREDICATE_EXECUTING) &&
719	    (walk_state->control_state->control.predicate_op == op)) {
720		status =
721		    acpi_ds_get_predicate_value(walk_state,
722						walk_state->result_obj);
723		walk_state->result_obj = NULL;
724	}
725
726cleanup:
727
728	if (walk_state->result_obj) {
729
730		/* Break to debugger to display result */
731
732		acpi_db_display_result_object(walk_state->result_obj,
733					      walk_state);
734
735		/*
736		 * Delete the result op if and only if:
737		 * Parent will not use the result -- such as any
738		 * non-nested type2 op in a method (parent will be method)
739		 */
740		acpi_ds_delete_result_if_not_used(op, walk_state->result_obj,
741						  walk_state);
742	}
743#ifdef _UNDER_DEVELOPMENT
744
745	if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
746		acpi_db_method_end(walk_state);
747	}
748#endif
749
750	/* Invoke exception handler on error */
751
752	if (ACPI_FAILURE(status)) {
753		status = acpi_ds_method_error(status, walk_state);
754	}
755
756	/* Always clear the object stack */
757
758	walk_state->num_operands = 0;
759	return_ACPI_STATUS(status);
760}