drivers/acpi/acpica/dswload2.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: dswload2 - Dispatcher second pass namespace load callbacks
   5  *
   6  * Copyright (C) 2000 - 2020, Intel Corp.
   7  *
   8  *****************************************************************************/
   9
  10 #include <acpi/acpi.h>
  11 #include "accommon.h"
  12 #include "acparser.h"
  13 #include "amlcode.h"
  14 #include "acdispat.h"
  15 #include "acinterp.h"
  16 #include "acnamesp.h"
  17 #include "acevents.h"
  18 #ifdef ACPI_EXEC_APP
  19 #include "aecommon.h"
  20 #endif
  21
  22 #define _COMPONENT          ACPI_DISPATCHER
  23 ACPI_MODULE_NAME("dswload2")
  24
  25 /*******************************************************************************
  26  *
  27  * FUNCTION:    acpi_ds_load2_begin_op
  28  *
  29  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  30  *              out_op          - Where to return op if a new one is created
  31  *
  32  * RETURN:      Status
  33  *
  34  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
  35  *
  36  ******************************************************************************/
  37 acpi_status
  38 acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
  39                        union acpi_parse_object **out_op)
  40 {
  41         union acpi_parse_object *op;
  42         struct acpi_namespace_node *node;
  43         acpi_status status;
  44         acpi_object_type object_type;
  45         char *buffer_ptr;
  46         u32 flags;
  47
  48         ACPI_FUNCTION_TRACE(ds_load2_begin_op);
  49
  50         op = walk_state->op;
  51         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
  52                           walk_state));
  53
  54         if (op) {
  55                 if ((walk_state->control_state) &&
  56                     (walk_state->control_state->common.state ==
  57                      ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
  58
  59                         /* We are executing a while loop outside of a method */
  60
  61                         status = acpi_ds_exec_begin_op(walk_state, out_op);
  62                         return_ACPI_STATUS(status);
  63                 }
  64
  65                 /* We only care about Namespace opcodes here */
  66
  67                 if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
  68                      (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
  69                     (!(walk_state->op_info->flags & AML_NAMED))) {
  70                         return_ACPI_STATUS(AE_OK);
  71                 }
  72
  73                 /* Get the name we are going to enter or lookup in the namespace */
  74
  75                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
  76
  77                         /* For Namepath op, get the path string */
  78
  79                         buffer_ptr = op->common.value.string;
  80                         if (!buffer_ptr) {
  81
  82                                 /* No name, just exit */
  83
  84                                 return_ACPI_STATUS(AE_OK);
  85                         }
  86                 } else {
  87                         /* Get name from the op */
  88
  89                         buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
  90                 }
  91         } else {
  92                 /* Get the namestring from the raw AML */
  93
  94                 buffer_ptr =
  95                     acpi_ps_get_next_namestring(&walk_state->parser_state);
  96         }
  97
  98         /* Map the opcode into an internal object type */
  99
 100         object_type = walk_state->op_info->object_type;
 101
 102         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 103                           "State=%p Op=%p Type=%X\n", walk_state, op,
 104                           object_type));
 105
 106         switch (walk_state->opcode) {
 107         case AML_FIELD_OP:
 108         case AML_BANK_FIELD_OP:
 109         case AML_INDEX_FIELD_OP:
 110
 111                 node = NULL;
 112                 status = AE_OK;
 113                 break;
 114
 115         case AML_INT_NAMEPATH_OP:
 116                 /*
 117                  * The name_path is an object reference to an existing object.
 118                  * Don't enter the name into the namespace, but look it up
 119                  * for use later.
 120                  */
 121                 status =
 122                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 123                                    object_type, ACPI_IMODE_EXECUTE,
 124                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 125                 break;
 126
 127         case AML_SCOPE_OP:
 128
 129                 /* Special case for Scope(\) -> refers to the Root node */
 130
 131                 if (op && (op->named.node == acpi_gbl_root_node)) {
 132                         node = op->named.node;
 133
 134                         status =
 135                             acpi_ds_scope_stack_push(node, object_type,
 136                                                      walk_state);
 137                         if (ACPI_FAILURE(status)) {
 138                                 return_ACPI_STATUS(status);
 139                         }
 140                 } else {
 141                         /*
 142                          * The Path is an object reference to an existing object.
 143                          * Don't enter the name into the namespace, but look it up
 144                          * for use later.
 145                          */
 146                         status =
 147                             acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 148                                            object_type, ACPI_IMODE_EXECUTE,
 149                                            ACPI_NS_SEARCH_PARENT, walk_state,
 150                                            &(node));
 151                         if (ACPI_FAILURE(status)) {
 152 #ifdef ACPI_ASL_COMPILER
 153                                 if (status == AE_NOT_FOUND) {
 154                                         status = AE_OK;
 155                                 } else {
 156                                         ACPI_ERROR_NAMESPACE(walk_state->
 157                                                              scope_info,
 158                                                              buffer_ptr,
 159                                                              status);
 160                                 }
 161 #else
 162                                 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 163                                                      buffer_ptr, status);
 164 #endif
 165                                 return_ACPI_STATUS(status);
 166                         }
 167                 }
 168
 169                 /*
 170                  * We must check to make sure that the target is
 171                  * one of the opcodes that actually opens a scope
 172                  */
 173                 switch (node->type) {
 174                 case ACPI_TYPE_ANY:
 175                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope */
 176                 case ACPI_TYPE_DEVICE:
 177                 case ACPI_TYPE_POWER:
 178                 case ACPI_TYPE_PROCESSOR:
 179                 case ACPI_TYPE_THERMAL:
 180
 181                         /* These are acceptable types */
 182                         break;
 183
 184                 case ACPI_TYPE_INTEGER:
 185                 case ACPI_TYPE_STRING:
 186                 case ACPI_TYPE_BUFFER:
 187
 188                         /*
 189                          * These types we will allow, but we will change the type.
 190                          * This enables some existing code of the form:
 191                          *
 192                          *  Name (DEB, 0)
 193                          *  Scope (DEB) { ... }
 194                          */
 195                         ACPI_WARNING((AE_INFO,
 196                                       "Type override - [%4.4s] had invalid type (%s) "
 197                                       "for Scope operator, changed to type ANY",
 198                                       acpi_ut_get_node_name(node),
 199                                       acpi_ut_get_type_name(node->type)));
 200
 201                         node->type = ACPI_TYPE_ANY;
 202                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 203                         break;
 204
 205                 case ACPI_TYPE_METHOD:
 206
 207                         /*
 208                          * Allow scope change to root during execution of module-level
 209                          * code. Root is typed METHOD during this time.
 210                          */
 211                         if ((node == acpi_gbl_root_node) &&
 212                             (walk_state->
 213                              parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 214                                 break;
 215                         }
 216
 217                         /*lint -fallthrough */
 218
 219                 default:
 220
 221                         /* All other types are an error */
 222
 223                         ACPI_ERROR((AE_INFO,
 224                                     "Invalid type (%s) for target of "
 225                                     "Scope operator [%4.4s] (Cannot override)",
 226                                     acpi_ut_get_type_name(node->type),
 227                                     acpi_ut_get_node_name(node)));
 228
 229                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 230                 }
 231                 break;
 232
 233         default:
 234
 235                 /* All other opcodes */
 236
 237                 if (op && op->common.node) {
 238
 239                         /* This op/node was previously entered into the namespace */
 240
 241                         node = op->common.node;
 242
 243                         if (acpi_ns_opens_scope(object_type)) {
 244                                 status =
 245                                     acpi_ds_scope_stack_push(node, object_type,
 246                                                              walk_state);
 247                                 if (ACPI_FAILURE(status)) {
 248                                         return_ACPI_STATUS(status);
 249                                 }
 250                         }
 251
 252                         return_ACPI_STATUS(AE_OK);
 253                 }
 254
 255                 /*
 256                  * Enter the named type into the internal namespace. We enter the name
 257                  * as we go downward in the parse tree. Any necessary subobjects that
 258                  * involve arguments to the opcode must be created as we go back up the
 259                  * parse tree later.
 260                  *
 261                  * Note: Name may already exist if we are executing a deferred opcode.
 262                  */
 263                 if (walk_state->deferred_node) {
 264
 265                         /* This name is already in the namespace, get the node */
 266
 267                         node = walk_state->deferred_node;
 268                         status = AE_OK;
 269                         break;
 270                 }
 271
 272                 flags = ACPI_NS_NO_UPSEARCH;
 273                 if (walk_state->pass_number == ACPI_IMODE_EXECUTE) {
 274
 275                         /* Execution mode, node cannot already exist, node is temporary */
 276
 277                         flags |= ACPI_NS_ERROR_IF_FOUND;
 278
 279                         if (!
 280                             (walk_state->
 281                              parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 282                                 flags |= ACPI_NS_TEMPORARY;
 283                         }
 284                 }
 285 #ifdef ACPI_ASL_COMPILER
 286
 287                 /*
 288                  * Do not open a scope for AML_EXTERNAL_OP
 289                  * acpi_ns_lookup can open a new scope based on the object type
 290                  * of this op. AML_EXTERNAL_OP is a declaration rather than a
 291                  * definition. In the case that this external is a method object,
 292                  * acpi_ns_lookup will open a new scope. However, an AML_EXTERNAL_OP
 293                  * associated with the ACPI_TYPE_METHOD is a declaration, rather than
 294                  * a definition. Flags is set to avoid opening a scope for any
 295                  * AML_EXTERNAL_OP.
 296                  */
 297                 if (walk_state->opcode == AML_EXTERNAL_OP) {
 298                         flags |= ACPI_NS_DONT_OPEN_SCOPE;
 299                 }
 300 #endif
 301
 302                 /*
 303                  * For name creation opcodes, the full namepath prefix must
 304                  * exist, except for the final (new) nameseg.
 305                  */
 306                 if (walk_state->op_info->flags & AML_NAMED) {
 307                         flags |= ACPI_NS_PREFIX_MUST_EXIST;
 308                 }
 309
 310                 /* Add new entry or lookup existing entry */
 311
 312                 status =
 313                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 314                                    object_type, ACPI_IMODE_LOAD_PASS2, flags,
 315                                    walk_state, &node);
 316
 317                 if (ACPI_SUCCESS(status) && (flags & ACPI_NS_TEMPORARY)) {
 318                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 319                                           "***New Node [%4.4s] %p is temporary\n",
 320                                           acpi_ut_get_node_name(node), node));
 321                 }
 322                 break;
 323         }
 324
 325         if (ACPI_FAILURE(status)) {
 326                 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 327                                      buffer_ptr, status);
 328                 return_ACPI_STATUS(status);
 329         }
 330
 331         if (!op) {
 332
 333                 /* Create a new op */
 334
 335                 op = acpi_ps_alloc_op(walk_state->opcode, walk_state->aml);
 336                 if (!op) {
 337                         return_ACPI_STATUS(AE_NO_MEMORY);
 338                 }
 339
 340                 /* Initialize the new op */
 341
 342                 if (node) {
 343                         op->named.name = node->name.integer;
 344                 }
 345                 *out_op = op;
 346         }
 347
 348         /*
 349          * Put the Node in the "op" object that the parser uses, so we
 350          * can get it again quickly when this scope is closed
 351          */
 352         op->common.node = node;
 353         return_ACPI_STATUS(status);
 354 }
 355
 356 /*******************************************************************************
 357  *
 358  * FUNCTION:    acpi_ds_load2_end_op
 359  *
 360  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 361  *
 362  * RETURN:      Status
 363  *
 364  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 365  *              both control methods and everything else.
 366  *
 367  ******************************************************************************/
 368
 369 acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 370 {
 371         union acpi_parse_object *op;
 372         acpi_status status = AE_OK;
 373         acpi_object_type object_type;
 374         struct acpi_namespace_node *node;
 375         union acpi_parse_object *arg;
 376         struct acpi_namespace_node *new_node;
 377         u32 i;
 378         u8 region_space;
 379 #ifdef ACPI_EXEC_APP
 380         union acpi_operand_object *obj_desc;
 381         char *namepath;
 382 #endif
 383
 384         ACPI_FUNCTION_TRACE(ds_load2_end_op);
 385
 386         op = walk_state->op;
 387         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
 388                           walk_state->op_info->name, op, walk_state));
 389
 390         /* Check if opcode had an associated namespace object */
 391
 392         if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
 393                 return_ACPI_STATUS(AE_OK);
 394         }
 395
 396         if (op->common.aml_opcode == AML_SCOPE_OP) {
 397                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 398                                   "Ending scope Op=%p State=%p\n", op,
 399                                   walk_state));
 400         }
 401
 402         object_type = walk_state->op_info->object_type;
 403
 404         /*
 405          * Get the Node/name from the earlier lookup
 406          * (It was saved in the *op structure)
 407          */
 408         node = op->common.node;
 409
 410         /*
 411          * Put the Node on the object stack (Contains the ACPI Name of
 412          * this object)
 413          */
 414         walk_state->operands[0] = (void *)node;
 415         walk_state->num_operands = 1;
 416
 417         /* Pop the scope stack */
 418
 419         if (acpi_ns_opens_scope(object_type) &&
 420             (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
 421                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 422                                   "(%s) Popping scope for Op %p\n",
 423                                   acpi_ut_get_type_name(object_type), op));
 424
 425                 status = acpi_ds_scope_stack_pop(walk_state);
 426                 if (ACPI_FAILURE(status)) {
 427                         goto cleanup;
 428                 }
 429         }
 430
 431         /*
 432          * Named operations are as follows:
 433          *
 434          * AML_ALIAS
 435          * AML_BANKFIELD
 436          * AML_CREATEBITFIELD
 437          * AML_CREATEBYTEFIELD
 438          * AML_CREATEDWORDFIELD
 439          * AML_CREATEFIELD
 440          * AML_CREATEQWORDFIELD
 441          * AML_CREATEWORDFIELD
 442          * AML_DATA_REGION
 443          * AML_DEVICE
 444          * AML_EVENT
 445          * AML_FIELD
 446          * AML_INDEXFIELD
 447          * AML_METHOD
 448          * AML_METHODCALL
 449          * AML_MUTEX
 450          * AML_NAME
 451          * AML_NAMEDFIELD
 452          * AML_OPREGION
 453          * AML_POWERRES
 454          * AML_PROCESSOR
 455          * AML_SCOPE
 456          * AML_THERMALZONE
 457          */
 458
 459         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 460                           "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
 461                           acpi_ps_get_opcode_name(op->common.aml_opcode),
 462                           walk_state, op, node));
 463
 464         /* Decode the opcode */
 465
 466         arg = op->common.value.arg;
 467
 468         switch (walk_state->op_info->type) {
 469
 470         case AML_TYPE_CREATE_FIELD:
 471                 /*
 472                  * Create the field object, but the field buffer and index must
 473                  * be evaluated later during the execution phase
 474                  */
 475                 status = acpi_ds_create_buffer_field(op, walk_state);
 476                 if (ACPI_FAILURE(status)) {
 477                         ACPI_EXCEPTION((AE_INFO, status,
 478                                         "CreateBufferField failure"));
 479                         goto cleanup;
 480                         }
 481                 break;
 482
 483         case AML_TYPE_NAMED_FIELD:
 484                 /*
 485                  * If we are executing a method, initialize the field
 486                  */
 487                 if (walk_state->method_node) {
 488                         status = acpi_ds_init_field_objects(op, walk_state);
 489                 }
 490
 491                 switch (op->common.aml_opcode) {
 492                 case AML_INDEX_FIELD_OP:
 493
 494                         status =
 495                             acpi_ds_create_index_field(op,
 496                                                        (acpi_handle)arg->common.
 497                                                        node, walk_state);
 498                         break;
 499
 500                 case AML_BANK_FIELD_OP:
 501
 502                         status =
 503                             acpi_ds_create_bank_field(op, arg->common.node,
 504                                                       walk_state);
 505                         break;
 506
 507                 case AML_FIELD_OP:
 508
 509                         status =
 510                             acpi_ds_create_field(op, arg->common.node,
 511                                                  walk_state);
 512                         break;
 513
 514                 default:
 515
 516                         /* All NAMED_FIELD opcodes must be handled above */
 517                         break;
 518                 }
 519                 break;
 520
 521         case AML_TYPE_NAMED_SIMPLE:
 522
 523                 status = acpi_ds_create_operands(walk_state, arg);
 524                 if (ACPI_FAILURE(status)) {
 525                         goto cleanup;
 526                 }
 527
 528                 switch (op->common.aml_opcode) {
 529                 case AML_PROCESSOR_OP:
 530
 531                         status = acpi_ex_create_processor(walk_state);
 532                         break;
 533
 534                 case AML_POWER_RESOURCE_OP:
 535
 536                         status = acpi_ex_create_power_resource(walk_state);
 537                         break;
 538
 539                 case AML_MUTEX_OP:
 540
 541                         status = acpi_ex_create_mutex(walk_state);
 542                         break;
 543
 544                 case AML_EVENT_OP:
 545
 546                         status = acpi_ex_create_event(walk_state);
 547                         break;
 548
 549                 case AML_ALIAS_OP:
 550
 551                         status = acpi_ex_create_alias(walk_state);
 552                         break;
 553
 554                 default:
 555
 556                         /* Unknown opcode */
 557
 558                         status = AE_OK;
 559                         goto cleanup;
 560                 }
 561
 562                 /* Delete operands */
 563
 564                 for (i = 1; i < walk_state->num_operands; i++) {
 565                         acpi_ut_remove_reference(walk_state->operands[i]);
 566                         walk_state->operands[i] = NULL;
 567                 }
 568
 569                 break;
 570
 571         case AML_TYPE_NAMED_COMPLEX:
 572
 573                 switch (op->common.aml_opcode) {
 574                 case AML_REGION_OP:
 575                 case AML_DATA_REGION_OP:
 576
 577                         if (op->common.aml_opcode == AML_REGION_OP) {
 578                                 region_space = (acpi_adr_space_type)
 579                                     ((op->common.value.arg)->common.value.
 580                                      integer);
 581                         } else {
 582                                 region_space = ACPI_ADR_SPACE_DATA_TABLE;
 583                         }
 584
 585                         /*
 586                          * The op_region is not fully parsed at this time. The only valid
 587                          * argument is the space_id. (We must save the address of the
 588                          * AML of the address and length operands)
 589                          *
 590                          * If we have a valid region, initialize it. The namespace is
 591                          * unlocked at this point.
 592                          *
 593                          * Need to unlock interpreter if it is locked (if we are running
 594                          * a control method), in order to allow _REG methods to be run
 595                          * during acpi_ev_initialize_region.
 596                          */
 597                         if (walk_state->method_node) {
 598                                 /*
 599                                  * Executing a method: initialize the region and unlock
 600                                  * the interpreter
 601                                  */
 602                                 status = acpi_ex_create_region(op->named.data,
 603                                                                op->named.length,
 604                                                                region_space,
 605                                                                walk_state);
 606                                 if (ACPI_FAILURE(status)) {
 607                                         return_ACPI_STATUS(status);
 608                                 }
 609                         }
 610
 611                         status =
 612                             acpi_ev_initialize_region
 613                             (acpi_ns_get_attached_object(node));
 614                         break;
 615
 616                 case AML_NAME_OP:
 617
 618                         status = acpi_ds_create_node(walk_state, node, op);
 619                         if (ACPI_FAILURE(status)) {
 620                                 goto cleanup;
 621                         }
 622 #ifdef ACPI_EXEC_APP
 623                         /*
 624                          * acpi_exec support for namespace initialization file (initialize
 625                          * Name opcodes in this code.)
 626                          */
 627                         namepath = acpi_ns_get_external_pathname(node);
 628                         status = ae_lookup_init_file_entry(namepath, &obj_desc);
 629                         if (ACPI_SUCCESS(status)) {
 630
 631                                 /* Detach any existing object, attach new object */
 632
 633                                 if (node->object) {
 634                                         acpi_ns_detach_object(node);
 635                                 }
 636                                 acpi_ns_attach_object(node, obj_desc,
 637                                                       obj_desc->common.type);
 638                         }
 639                         ACPI_FREE(namepath);
 640                         status = AE_OK;
 641 #endif
 642                         break;
 643
 644                 case AML_METHOD_OP:
 645                         /*
 646                          * method_op pkg_length name_string method_flags term_list
 647                          *
 648                          * Note: We must create the method node/object pair as soon as we
 649                          * see the method declaration. This allows later pass1 parsing
 650                          * of invocations of the method (need to know the number of
 651                          * arguments.)
 652                          */
 653                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 654                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 655                                           walk_state, op, op->named.node));
 656
 657                         if (!acpi_ns_get_attached_object(op->named.node)) {
 658                                 walk_state->operands[0] =
 659                                     ACPI_CAST_PTR(void, op->named.node);
 660                                 walk_state->num_operands = 1;
 661
 662                                 status =
 663                                     acpi_ds_create_operands(walk_state,
 664                                                             op->common.value.
 665                                                             arg);
 666                                 if (ACPI_SUCCESS(status)) {
 667                                         status =
 668                                             acpi_ex_create_method(op->named.
 669                                                                   data,
 670                                                                   op->named.
 671                                                                   length,
 672                                                                   walk_state);
 673                                 }
 674
 675                                 walk_state->operands[0] = NULL;
 676                                 walk_state->num_operands = 0;
 677
 678                                 if (ACPI_FAILURE(status)) {
 679                                         return_ACPI_STATUS(status);
 680                                 }
 681                         }
 682                         break;
 683
 684                 default:
 685
 686                         /* All NAMED_COMPLEX opcodes must be handled above */
 687                         break;
 688                 }
 689                 break;
 690
 691         case AML_CLASS_INTERNAL:
 692
 693                 /* case AML_INT_NAMEPATH_OP: */
 694                 break;
 695
 696         case AML_CLASS_METHOD_CALL:
 697
 698                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 699                                   "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
 700                                   walk_state, op, node));
 701
 702                 /*
 703                  * Lookup the method name and save the Node
 704                  */
 705                 status =
 706                     acpi_ns_lookup(walk_state->scope_info,
 707                                    arg->common.value.string, ACPI_TYPE_ANY,
 708                                    ACPI_IMODE_LOAD_PASS2,
 709                                    ACPI_NS_SEARCH_PARENT |
 710                                    ACPI_NS_DONT_OPEN_SCOPE, walk_state,
 711                                    &(new_node));
 712                 if (ACPI_SUCCESS(status)) {
 713                         /*
 714                          * Make sure that what we found is indeed a method
 715                          * We didn't search for a method on purpose, to see if the name
 716                          * would resolve
 717                          */
 718                         if (new_node->type != ACPI_TYPE_METHOD) {
 719                                 status = AE_AML_OPERAND_TYPE;
 720                         }
 721
 722                         /* We could put the returned object (Node) on the object stack for
 723                          * later, but for now, we will put it in the "op" object that the
 724                          * parser uses, so we can get it again at the end of this scope
 725                          */
 726                         op->common.node = new_node;
 727                 } else {
 728                         ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 729                                              arg->common.value.string, status);
 730                 }
 731                 break;
 732
 733         default:
 734
 735                 break;
 736         }
 737
 738 cleanup:
 739
 740         /* Remove the Node pushed at the very beginning */
 741
 742         walk_state->operands[0] = NULL;
 743         walk_state->num_operands = 0;
 744         return_ACPI_STATUS(status);
 745 }