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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.02/*******************************************************************************3 *4 * Module Name: dsutils - Dispatcher utilities5 *6 ******************************************************************************/7 8#include <acpi/acpi.h>9#include "accommon.h"10#include "acparser.h"11#include "amlcode.h"12#include "acdispat.h"13#include "acinterp.h"14#include "acnamesp.h"15#include "acdebug.h"16 17#define _COMPONENT ACPI_DISPATCHER18ACPI_MODULE_NAME("dsutils")19 20/*******************************************************************************21 *22 * FUNCTION: acpi_ds_clear_implicit_return23 *24 * PARAMETERS: walk_state - Current State25 *26 * RETURN: None.27 *28 * DESCRIPTION: Clear and remove a reference on an implicit return value. Used29 * to delete "stale" return values (if enabled, the return value30 * from every operator is saved at least momentarily, in case the31 * parent method exits.)32 *33 ******************************************************************************/34void acpi_ds_clear_implicit_return(struct acpi_walk_state *walk_state)35{36 ACPI_FUNCTION_NAME(ds_clear_implicit_return);37 38 /*39 * Slack must be enabled for this feature40 */41 if (!acpi_gbl_enable_interpreter_slack) {42 return;43 }44 45 if (walk_state->implicit_return_obj) {46 /*47 * Delete any "stale" implicit return. However, in48 * complex statements, the implicit return value can be49 * bubbled up several levels.50 */51 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,52 "Removing reference on stale implicit return obj %p\n",53 walk_state->implicit_return_obj));54 55 acpi_ut_remove_reference(walk_state->implicit_return_obj);56 walk_state->implicit_return_obj = NULL;57 }58}59 60/*******************************************************************************61 *62 * FUNCTION: acpi_ds_do_implicit_return63 *64 * PARAMETERS: return_desc - The return value65 * walk_state - Current State66 * add_reference - True if a reference should be added to the67 * return object68 *69 * RETURN: TRUE if implicit return enabled, FALSE otherwise70 *71 * DESCRIPTION: Implements the optional "implicit return". We save the result72 * of every ASL operator and control method invocation in case the73 * parent method exit. Before storing a new return value, we74 * delete the previous return value.75 *76 ******************************************************************************/77 78u879acpi_ds_do_implicit_return(union acpi_operand_object *return_desc,80 struct acpi_walk_state *walk_state, u8 add_reference)81{82 ACPI_FUNCTION_NAME(ds_do_implicit_return);83 84 /*85 * Slack must be enabled for this feature, and we must86 * have a valid return object87 */88 if ((!acpi_gbl_enable_interpreter_slack) || (!return_desc)) {89 return (FALSE);90 }91 92 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,93 "Result %p will be implicitly returned; Prev=%p\n",94 return_desc, walk_state->implicit_return_obj));95 96 /*97 * Delete any "stale" implicit return value first. However, in98 * complex statements, the implicit return value can be99 * bubbled up several levels, so we don't clear the value if it100 * is the same as the return_desc.101 */102 if (walk_state->implicit_return_obj) {103 if (walk_state->implicit_return_obj == return_desc) {104 return (TRUE);105 }106 acpi_ds_clear_implicit_return(walk_state);107 }108 109 /* Save the implicit return value, add a reference if requested */110 111 walk_state->implicit_return_obj = return_desc;112 if (add_reference) {113 acpi_ut_add_reference(return_desc);114 }115 116 return (TRUE);117}118 119/*******************************************************************************120 *121 * FUNCTION: acpi_ds_is_result_used122 *123 * PARAMETERS: op - Current Op124 * walk_state - Current State125 *126 * RETURN: TRUE if result is used, FALSE otherwise127 *128 * DESCRIPTION: Check if a result object will be used by the parent129 *130 ******************************************************************************/131 132u8133acpi_ds_is_result_used(union acpi_parse_object * op,134 struct acpi_walk_state * walk_state)135{136 const struct acpi_opcode_info *parent_info;137 138 ACPI_FUNCTION_TRACE_PTR(ds_is_result_used, op);139 140 /* Must have both an Op and a Result Object */141 142 if (!op) {143 ACPI_ERROR((AE_INFO, "Null Op"));144 return_UINT8(TRUE);145 }146 147 /*148 * We know that this operator is not a149 * Return() operator (would not come here.) The following code is the150 * optional support for a so-called "implicit return". Some AML code151 * assumes that the last value of the method is "implicitly" returned152 * to the caller. Just save the last result as the return value.153 * NOTE: this is optional because the ASL language does not actually154 * support this behavior.155 */156 (void)acpi_ds_do_implicit_return(walk_state->result_obj, walk_state,157 TRUE);158 159 /*160 * Now determine if the parent will use the result161 *162 * If there is no parent, or the parent is a scope_op, we are executing163 * at the method level. An executing method typically has no parent,164 * since each method is parsed separately. A method invoked externally165 * via execute_control_method has a scope_op as the parent.166 */167 if ((!op->common.parent) ||168 (op->common.parent->common.aml_opcode == AML_SCOPE_OP)) {169 170 /* No parent, the return value cannot possibly be used */171 172 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,173 "At Method level, result of [%s] not used\n",174 acpi_ps_get_opcode_name(op->common.175 aml_opcode)));176 return_UINT8(FALSE);177 }178 179 /* Get info on the parent. The root_op is AML_SCOPE */180 181 parent_info =182 acpi_ps_get_opcode_info(op->common.parent->common.aml_opcode);183 if (parent_info->class == AML_CLASS_UNKNOWN) {184 ACPI_ERROR((AE_INFO, "Unknown parent opcode Op=%p", op));185 return_UINT8(FALSE);186 }187 188 /*189 * Decide what to do with the result based on the parent. If190 * the parent opcode will not use the result, delete the object.191 * Otherwise leave it as is, it will be deleted when it is used192 * as an operand later.193 */194 switch (parent_info->class) {195 case AML_CLASS_CONTROL:196 197 switch (op->common.parent->common.aml_opcode) {198 case AML_RETURN_OP:199 200 /* Never delete the return value associated with a return opcode */201 202 goto result_used;203 204 case AML_IF_OP:205 case AML_WHILE_OP:206 /*207 * If we are executing the predicate AND this is the predicate op,208 * we will use the return value209 */210 if ((walk_state->control_state->common.state ==211 ACPI_CONTROL_PREDICATE_EXECUTING) &&212 (walk_state->control_state->control.predicate_op ==213 op)) {214 goto result_used;215 }216 break;217 218 default:219 220 /* Ignore other control opcodes */221 222 break;223 }224 225 /* The general control opcode returns no result */226 227 goto result_not_used;228 229 case AML_CLASS_CREATE:230 /*231 * These opcodes allow term_arg(s) as operands and therefore232 * the operands can be method calls. The result is used.233 */234 goto result_used;235 236 case AML_CLASS_NAMED_OBJECT:237 238 if ((op->common.parent->common.aml_opcode == AML_REGION_OP) ||239 (op->common.parent->common.aml_opcode == AML_DATA_REGION_OP)240 || (op->common.parent->common.aml_opcode == AML_PACKAGE_OP)241 || (op->common.parent->common.aml_opcode == AML_BUFFER_OP)242 || (op->common.parent->common.aml_opcode ==243 AML_VARIABLE_PACKAGE_OP)244 || (op->common.parent->common.aml_opcode ==245 AML_INT_EVAL_SUBTREE_OP)246 || (op->common.parent->common.aml_opcode ==247 AML_BANK_FIELD_OP)) {248 /*249 * These opcodes allow term_arg(s) as operands and therefore250 * the operands can be method calls. The result is used.251 */252 goto result_used;253 }254 255 goto result_not_used;256 257 default:258 /*259 * In all other cases. the parent will actually use the return260 * object, so keep it.261 */262 goto result_used;263 }264 265result_used:266 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,267 "Result of [%s] used by Parent [%s] Op=%p\n",268 acpi_ps_get_opcode_name(op->common.aml_opcode),269 acpi_ps_get_opcode_name(op->common.parent->common.270 aml_opcode), op));271 272 return_UINT8(TRUE);273 274result_not_used:275 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,276 "Result of [%s] not used by Parent [%s] Op=%p\n",277 acpi_ps_get_opcode_name(op->common.aml_opcode),278 acpi_ps_get_opcode_name(op->common.parent->common.279 aml_opcode), op));280 281 return_UINT8(FALSE);282}283 284/*******************************************************************************285 *286 * FUNCTION: acpi_ds_delete_result_if_not_used287 *288 * PARAMETERS: op - Current parse Op289 * result_obj - Result of the operation290 * walk_state - Current state291 *292 * RETURN: Status293 *294 * DESCRIPTION: Used after interpretation of an opcode. If there is an internal295 * result descriptor, check if the parent opcode will actually use296 * this result. If not, delete the result now so that it will297 * not become orphaned.298 *299 ******************************************************************************/300 301void302acpi_ds_delete_result_if_not_used(union acpi_parse_object *op,303 union acpi_operand_object *result_obj,304 struct acpi_walk_state *walk_state)305{306 union acpi_operand_object *obj_desc;307 acpi_status status;308 309 ACPI_FUNCTION_TRACE_PTR(ds_delete_result_if_not_used, result_obj);310 311 if (!op) {312 ACPI_ERROR((AE_INFO, "Null Op"));313 return_VOID;314 }315 316 if (!result_obj) {317 return_VOID;318 }319 320 if (!acpi_ds_is_result_used(op, walk_state)) {321 322 /* Must pop the result stack (obj_desc should be equal to result_obj) */323 324 status = acpi_ds_result_pop(&obj_desc, walk_state);325 if (ACPI_SUCCESS(status)) {326 acpi_ut_remove_reference(result_obj);327 }328 }329 330 return_VOID;331}332 333/*******************************************************************************334 *335 * FUNCTION: acpi_ds_resolve_operands336 *337 * PARAMETERS: walk_state - Current walk state with operands on stack338 *339 * RETURN: Status340 *341 * DESCRIPTION: Resolve all operands to their values. Used to prepare342 * arguments to a control method invocation (a call from one343 * method to another.)344 *345 ******************************************************************************/346 347acpi_status acpi_ds_resolve_operands(struct acpi_walk_state *walk_state)348{349 u32 i;350 acpi_status status = AE_OK;351 352 ACPI_FUNCTION_TRACE_PTR(ds_resolve_operands, walk_state);353 354 /*355 * Attempt to resolve each of the valid operands356 * Method arguments are passed by reference, not by value. This means357 * that the actual objects are passed, not copies of the objects.358 */359 for (i = 0; i < walk_state->num_operands; i++) {360 status =361 acpi_ex_resolve_to_value(&walk_state->operands[i],362 walk_state);363 if (ACPI_FAILURE(status)) {364 break;365 }366 }367 368 return_ACPI_STATUS(status);369}370 371/*******************************************************************************372 *373 * FUNCTION: acpi_ds_clear_operands374 *375 * PARAMETERS: walk_state - Current walk state with operands on stack376 *377 * RETURN: None378 *379 * DESCRIPTION: Clear all operands on the current walk state operand stack.380 *381 ******************************************************************************/382 383void acpi_ds_clear_operands(struct acpi_walk_state *walk_state)384{385 u32 i;386 387 ACPI_FUNCTION_TRACE_PTR(ds_clear_operands, walk_state);388 389 /* Remove a reference on each operand on the stack */390 391 for (i = 0; i < walk_state->num_operands; i++) {392 /*393 * Remove a reference to all operands, including both394 * "Arguments" and "Targets".395 */396 acpi_ut_remove_reference(walk_state->operands[i]);397 walk_state->operands[i] = NULL;398 }399 400 walk_state->num_operands = 0;401 return_VOID;402}403 404/*******************************************************************************405 *406 * FUNCTION: acpi_ds_create_operand407 *408 * PARAMETERS: walk_state - Current walk state409 * arg - Parse object for the argument410 * arg_index - Which argument (zero based)411 *412 * RETURN: Status413 *414 * DESCRIPTION: Translate a parse tree object that is an argument to an AML415 * opcode to the equivalent interpreter object. This may include416 * looking up a name or entering a new name into the internal417 * namespace.418 *419 ******************************************************************************/420 421acpi_status422acpi_ds_create_operand(struct acpi_walk_state *walk_state,423 union acpi_parse_object *arg, u32 arg_index)424{425 acpi_status status = AE_OK;426 char *name_string;427 u32 name_length;428 union acpi_operand_object *obj_desc;429 union acpi_parse_object *parent_op;430 u16 opcode;431 acpi_interpreter_mode interpreter_mode;432 const struct acpi_opcode_info *op_info;433 434 ACPI_FUNCTION_TRACE_PTR(ds_create_operand, arg);435 436 /* A valid name must be looked up in the namespace */437 438 if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) &&439 (arg->common.value.string) &&440 !(arg->common.flags & ACPI_PARSEOP_IN_STACK)) {441 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n",442 arg));443 444 /* Get the entire name string from the AML stream */445 446 status = acpi_ex_get_name_string(ACPI_TYPE_ANY,447 arg->common.value.buffer,448 &name_string, &name_length);449 450 if (ACPI_FAILURE(status)) {451 return_ACPI_STATUS(status);452 }453 454 /* All prefixes have been handled, and the name is in name_string */455 456 /*457 * Special handling for buffer_field declarations. This is a deferred458 * opcode that unfortunately defines the field name as the last459 * parameter instead of the first. We get here when we are performing460 * the deferred execution, so the actual name of the field is already461 * in the namespace. We don't want to attempt to look it up again462 * because we may be executing in a different scope than where the463 * actual opcode exists.464 */465 if ((walk_state->deferred_node) &&466 (walk_state->deferred_node->type == ACPI_TYPE_BUFFER_FIELD)467 && (arg_index == (u32)468 ((walk_state->opcode == AML_CREATE_FIELD_OP) ? 3 : 2))) {469 obj_desc =470 ACPI_CAST_PTR(union acpi_operand_object,471 walk_state->deferred_node);472 status = AE_OK;473 } else { /* All other opcodes */474 475 /*476 * Differentiate between a namespace "create" operation477 * versus a "lookup" operation (IMODE_LOAD_PASS2 vs.478 * IMODE_EXECUTE) in order to support the creation of479 * namespace objects during the execution of control methods.480 */481 parent_op = arg->common.parent;482 op_info =483 acpi_ps_get_opcode_info(parent_op->common.484 aml_opcode);485 486 if ((op_info->flags & AML_NSNODE) &&487 (parent_op->common.aml_opcode !=488 AML_INT_METHODCALL_OP)489 && (parent_op->common.aml_opcode != AML_REGION_OP)490 && (parent_op->common.aml_opcode !=491 AML_INT_NAMEPATH_OP)) {492 493 /* Enter name into namespace if not found */494 495 interpreter_mode = ACPI_IMODE_LOAD_PASS2;496 } else {497 /* Return a failure if name not found */498 499 interpreter_mode = ACPI_IMODE_EXECUTE;500 }501 502 status =503 acpi_ns_lookup(walk_state->scope_info, name_string,504 ACPI_TYPE_ANY, interpreter_mode,505 ACPI_NS_SEARCH_PARENT |506 ACPI_NS_DONT_OPEN_SCOPE, walk_state,507 ACPI_CAST_INDIRECT_PTR(struct508 acpi_namespace_node,509 &obj_desc));510 /*511 * The only case where we pass through (ignore) a NOT_FOUND512 * error is for the cond_ref_of opcode.513 */514 if (status == AE_NOT_FOUND) {515 if (parent_op->common.aml_opcode ==516 AML_CONDITIONAL_REF_OF_OP) {517 /*518 * For the Conditional Reference op, it's OK if519 * the name is not found; We just need a way to520 * indicate this to the interpreter, set the521 * object to the root522 */523 obj_desc =524 ACPI_CAST_PTR(union525 acpi_operand_object,526 acpi_gbl_root_node);527 status = AE_OK;528 } else if (parent_op->common.aml_opcode ==529 AML_EXTERNAL_OP) {530 /*531 * This opcode should never appear here. It is used only532 * by AML disassemblers and is surrounded by an If(0)533 * by the ASL compiler.534 *535 * Therefore, if we see it here, it is a serious error.536 */537 status = AE_AML_BAD_OPCODE;538 } else {539 /*540 * We just plain didn't find it -- which is a541 * very serious error at this point542 */543 status = AE_AML_NAME_NOT_FOUND;544 }545 }546 547 if (ACPI_FAILURE(status)) {548 ACPI_ERROR_NAMESPACE(walk_state->scope_info,549 name_string, status);550 }551 }552 553 /* Free the namestring created above */554 555 ACPI_FREE(name_string);556 557 /* Check status from the lookup */558 559 if (ACPI_FAILURE(status)) {560 return_ACPI_STATUS(status);561 }562 563 /* Put the resulting object onto the current object stack */564 565 status = acpi_ds_obj_stack_push(obj_desc, walk_state);566 if (ACPI_FAILURE(status)) {567 return_ACPI_STATUS(status);568 }569 570 acpi_db_display_argument_object(obj_desc, walk_state);571 } else {572 /* Check for null name case */573 574 if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) &&575 !(arg->common.flags & ACPI_PARSEOP_IN_STACK)) {576 /*577 * If the name is null, this means that this is an578 * optional result parameter that was not specified579 * in the original ASL. Create a Zero Constant for a580 * placeholder. (Store to a constant is a Noop.)581 */582 opcode = AML_ZERO_OP; /* Has no arguments! */583 584 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,585 "Null namepath: Arg=%p\n", arg));586 } else {587 opcode = arg->common.aml_opcode;588 }589 590 /* Get the object type of the argument */591 592 op_info = acpi_ps_get_opcode_info(opcode);593 if (op_info->object_type == ACPI_TYPE_INVALID) {594 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);595 }596 597 if ((op_info->flags & AML_HAS_RETVAL) ||598 (arg->common.flags & ACPI_PARSEOP_IN_STACK)) {599 /*600 * Use value that was already previously returned601 * by the evaluation of this argument602 */603 status = acpi_ds_result_pop(&obj_desc, walk_state);604 if (ACPI_FAILURE(status)) {605 /*606 * Only error is underflow, and this indicates607 * a missing or null operand!608 */609 ACPI_EXCEPTION((AE_INFO, status,610 "Missing or null operand"));611 return_ACPI_STATUS(status);612 }613 } else {614 /* Create an ACPI_INTERNAL_OBJECT for the argument */615 616 obj_desc =617 acpi_ut_create_internal_object(op_info->618 object_type);619 if (!obj_desc) {620 return_ACPI_STATUS(AE_NO_MEMORY);621 }622 623 /* Initialize the new object */624 625 status =626 acpi_ds_init_object_from_op(walk_state, arg, opcode,627 &obj_desc);628 if (ACPI_FAILURE(status)) {629 acpi_ut_delete_object_desc(obj_desc);630 return_ACPI_STATUS(status);631 }632 }633 634 /* Put the operand object on the object stack */635 636 status = acpi_ds_obj_stack_push(obj_desc, walk_state);637 if (ACPI_FAILURE(status)) {638 return_ACPI_STATUS(status);639 }640 641 acpi_db_display_argument_object(obj_desc, walk_state);642 }643 644 return_ACPI_STATUS(AE_OK);645}646 647/*******************************************************************************648 *649 * FUNCTION: acpi_ds_create_operands650 *651 * PARAMETERS: walk_state - Current state652 * first_arg - First argument of a parser argument tree653 *654 * RETURN: Status655 *656 * DESCRIPTION: Convert an operator's arguments from a parse tree format to657 * namespace objects and place those argument object on the object658 * stack in preparation for evaluation by the interpreter.659 *660 ******************************************************************************/661 662acpi_status663acpi_ds_create_operands(struct acpi_walk_state *walk_state,664 union acpi_parse_object *first_arg)665{666 acpi_status status = AE_OK;667 union acpi_parse_object *arg;668 union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS];669 u32 arg_count = 0;670 u32 index = walk_state->num_operands;671 u32 i;672 673 ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg);674 675 /* Get all arguments in the list */676 677 arg = first_arg;678 while (arg) {679 if (index >= ACPI_OBJ_NUM_OPERANDS) {680 return_ACPI_STATUS(AE_BAD_DATA);681 }682 683 arguments[index] = arg;684 walk_state->operands[index] = NULL;685 686 /* Move on to next argument, if any */687 688 arg = arg->common.next;689 arg_count++;690 index++;691 }692 693 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,694 "NumOperands %d, ArgCount %d, Index %d\n",695 walk_state->num_operands, arg_count, index));696 697 /* Create the interpreter arguments, in reverse order */698 699 index--;700 for (i = 0; i < arg_count; i++) {701 arg = arguments[index];702 walk_state->operand_index = (u8)index;703 704 status = acpi_ds_create_operand(walk_state, arg, index);705 if (ACPI_FAILURE(status)) {706 goto cleanup;707 }708 709 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,710 "Created Arg #%u (%p) %u args total\n",711 index, arg, arg_count));712 index--;713 }714 715 return_ACPI_STATUS(status);716 717cleanup:718 /*719 * We must undo everything done above; meaning that we must720 * pop everything off of the operand stack and delete those721 * objects722 */723 acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state);724 725 ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index));726 return_ACPI_STATUS(status);727}728 729/*****************************************************************************730 *731 * FUNCTION: acpi_ds_evaluate_name_path732 *733 * PARAMETERS: walk_state - Current state of the parse tree walk,734 * the opcode of current operation should be735 * AML_INT_NAMEPATH_OP736 *737 * RETURN: Status738 *739 * DESCRIPTION: Translate the -name_path- parse tree object to the equivalent740 * interpreter object, convert it to value, if needed, duplicate741 * it, if needed, and push it onto the current result stack.742 *743 ****************************************************************************/744 745acpi_status acpi_ds_evaluate_name_path(struct acpi_walk_state *walk_state)746{747 acpi_status status = AE_OK;748 union acpi_parse_object *op = walk_state->op;749 union acpi_operand_object **operand = &walk_state->operands[0];750 union acpi_operand_object *new_obj_desc;751 u8 type;752 753 ACPI_FUNCTION_TRACE_PTR(ds_evaluate_name_path, walk_state);754 755 if (!op->common.parent) {756 757 /* This happens after certain exception processing */758 759 goto exit;760 }761 762 if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||763 (op->common.parent->common.aml_opcode == AML_VARIABLE_PACKAGE_OP) ||764 (op->common.parent->common.aml_opcode == AML_REF_OF_OP)) {765 766 /* TBD: Should we specify this feature as a bit of op_info->Flags of these opcodes? */767 768 goto exit;769 }770 771 status = acpi_ds_create_operand(walk_state, op, 0);772 if (ACPI_FAILURE(status)) {773 goto exit;774 }775 776 if (op->common.flags & ACPI_PARSEOP_TARGET) {777 new_obj_desc = *operand;778 goto push_result;779 }780 781 type = (*operand)->common.type;782 783 status = acpi_ex_resolve_to_value(operand, walk_state);784 if (ACPI_FAILURE(status)) {785 goto exit;786 }787 788 if (type == ACPI_TYPE_INTEGER) {789 790 /* It was incremented by acpi_ex_resolve_to_value */791 792 acpi_ut_remove_reference(*operand);793 794 status =795 acpi_ut_copy_iobject_to_iobject(*operand, &new_obj_desc,796 walk_state);797 if (ACPI_FAILURE(status)) {798 goto exit;799 }800 } else {801 /*802 * The object either was anew created or is803 * a Namespace node - don't decrement it.804 */805 new_obj_desc = *operand;806 }807 808 /* Cleanup for name-path operand */809 810 status = acpi_ds_obj_stack_pop(1, walk_state);811 if (ACPI_FAILURE(status)) {812 walk_state->result_obj = new_obj_desc;813 goto exit;814 }815 816push_result:817 818 walk_state->result_obj = new_obj_desc;819 820 status = acpi_ds_result_push(walk_state->result_obj, walk_state);821 if (ACPI_SUCCESS(status)) {822 823 /* Force to take it from stack */824 825 op->common.flags |= ACPI_PARSEOP_IN_STACK;826 }827 828exit:829 830 return_ACPI_STATUS(status);831}832