drivers/acpi/acpica/dswload2.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswload2 - Dispatcher second pass namespace load callbacks
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2011, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "amlcode.h"
  48 #include "acdispat.h"
  49 #include "acinterp.h"
  50 #include "acnamesp.h"
  51 #include "acevents.h"
  52
  53 #define _COMPONENT          ACPI_DISPATCHER
  54 ACPI_MODULE_NAME("dswload2")
  55
  56 /*******************************************************************************
  57  *
  58  * FUNCTION:    acpi_ds_load2_begin_op
  59  *
  60  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  61  *              out_op          - Wher to return op if a new one is created
  62  *
  63  * RETURN:      Status
  64  *
  65  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
  66  *
  67  ******************************************************************************/
  68 acpi_status
  69 acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
  70                        union acpi_parse_object **out_op)
  71 {
  72         union acpi_parse_object *op;
  73         struct acpi_namespace_node *node;
  74         acpi_status status;
  75         acpi_object_type object_type;
  76         char *buffer_ptr;
  77         u32 flags;
  78
  79         ACPI_FUNCTION_TRACE(ds_load2_begin_op);
  80
  81         op = walk_state->op;
  82         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
  83                           walk_state));
  84
  85         if (op) {
  86                 if ((walk_state->control_state) &&
  87                     (walk_state->control_state->common.state ==
  88                      ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
  89
  90                         /* We are executing a while loop outside of a method */
  91
  92                         status = acpi_ds_exec_begin_op(walk_state, out_op);
  93                         return_ACPI_STATUS(status);
  94                 }
  95
  96                 /* We only care about Namespace opcodes here */
  97
  98                 if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
  99                      (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
 100                     (!(walk_state->op_info->flags & AML_NAMED))) {
 101                         return_ACPI_STATUS(AE_OK);
 102                 }
 103
 104                 /* Get the name we are going to enter or lookup in the namespace */
 105
 106                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
 107
 108                         /* For Namepath op, get the path string */
 109
 110                         buffer_ptr = op->common.value.string;
 111                         if (!buffer_ptr) {
 112
 113                                 /* No name, just exit */
 114
 115                                 return_ACPI_STATUS(AE_OK);
 116                         }
 117                 } else {
 118                         /* Get name from the op */
 119
 120                         buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
 121                 }
 122         } else {
 123                 /* Get the namestring from the raw AML */
 124
 125                 buffer_ptr =
 126                     acpi_ps_get_next_namestring(&walk_state->parser_state);
 127         }
 128
 129         /* Map the opcode into an internal object type */
 130
 131         object_type = walk_state->op_info->object_type;
 132
 133         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 134                           "State=%p Op=%p Type=%X\n", walk_state, op,
 135                           object_type));
 136
 137         switch (walk_state->opcode) {
 138         case AML_FIELD_OP:
 139         case AML_BANK_FIELD_OP:
 140         case AML_INDEX_FIELD_OP:
 141
 142                 node = NULL;
 143                 status = AE_OK;
 144                 break;
 145
 146         case AML_INT_NAMEPATH_OP:
 147                 /*
 148                  * The name_path is an object reference to an existing object.
 149                  * Don't enter the name into the namespace, but look it up
 150                  * for use later.
 151                  */
 152                 status =
 153                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 154                                    object_type, ACPI_IMODE_EXECUTE,
 155                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 156                 break;
 157
 158         case AML_SCOPE_OP:
 159
 160                 /* Special case for Scope(\) -> refers to the Root node */
 161
 162                 if (op && (op->named.node == acpi_gbl_root_node)) {
 163                         node = op->named.node;
 164
 165                         status =
 166                             acpi_ds_scope_stack_push(node, object_type,
 167                                                      walk_state);
 168                         if (ACPI_FAILURE(status)) {
 169                                 return_ACPI_STATUS(status);
 170                         }
 171                 } else {
 172                         /*
 173                          * The Path is an object reference to an existing object.
 174                          * Don't enter the name into the namespace, but look it up
 175                          * for use later.
 176                          */
 177                         status =
 178                             acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 179                                            object_type, ACPI_IMODE_EXECUTE,
 180                                            ACPI_NS_SEARCH_PARENT, walk_state,
 181                                            &(node));
 182                         if (ACPI_FAILURE(status)) {
 183 #ifdef ACPI_ASL_COMPILER
 184                                 if (status == AE_NOT_FOUND) {
 185                                         status = AE_OK;
 186                                 } else {
 187                                         ACPI_ERROR_NAMESPACE(buffer_ptr,
 188                                                              status);
 189                                 }
 190 #else
 191                                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 192 #endif
 193                                 return_ACPI_STATUS(status);
 194                         }
 195                 }
 196
 197                 /*
 198                  * We must check to make sure that the target is
 199                  * one of the opcodes that actually opens a scope
 200                  */
 201                 switch (node->type) {
 202                 case ACPI_TYPE_ANY:
 203                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope */
 204                 case ACPI_TYPE_DEVICE:
 205                 case ACPI_TYPE_POWER:
 206                 case ACPI_TYPE_PROCESSOR:
 207                 case ACPI_TYPE_THERMAL:
 208
 209                         /* These are acceptable types */
 210                         break;
 211
 212                 case ACPI_TYPE_INTEGER:
 213                 case ACPI_TYPE_STRING:
 214                 case ACPI_TYPE_BUFFER:
 215
 216                         /*
 217                          * These types we will allow, but we will change the type.
 218                          * This enables some existing code of the form:
 219                          *
 220                          *  Name (DEB, 0)
 221                          *  Scope (DEB) { ... }
 222                          */
 223                         ACPI_WARNING((AE_INFO,
 224                                       "Type override - [%4.4s] had invalid type (%s) "
 225                                       "for Scope operator, changed to type ANY\n",
 226                                       acpi_ut_get_node_name(node),
 227                                       acpi_ut_get_type_name(node->type)));
 228
 229                         node->type = ACPI_TYPE_ANY;
 230                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 231                         break;
 232
 233                 default:
 234
 235                         /* All other types are an error */
 236
 237                         ACPI_ERROR((AE_INFO,
 238                                     "Invalid type (%s) for target of "
 239                                     "Scope operator [%4.4s] (Cannot override)",
 240                                     acpi_ut_get_type_name(node->type),
 241                                     acpi_ut_get_node_name(node)));
 242
 243                         return (AE_AML_OPERAND_TYPE);
 244                 }
 245                 break;
 246
 247         default:
 248
 249                 /* All other opcodes */
 250
 251                 if (op && op->common.node) {
 252
 253                         /* This op/node was previously entered into the namespace */
 254
 255                         node = op->common.node;
 256
 257                         if (acpi_ns_opens_scope(object_type)) {
 258                                 status =
 259                                     acpi_ds_scope_stack_push(node, object_type,
 260                                                              walk_state);
 261                                 if (ACPI_FAILURE(status)) {
 262                                         return_ACPI_STATUS(status);
 263                                 }
 264                         }
 265
 266                         return_ACPI_STATUS(AE_OK);
 267                 }
 268
 269                 /*
 270                  * Enter the named type into the internal namespace. We enter the name
 271                  * as we go downward in the parse tree. Any necessary subobjects that
 272                  * involve arguments to the opcode must be created as we go back up the
 273                  * parse tree later.
 274                  *
 275                  * Note: Name may already exist if we are executing a deferred opcode.
 276                  */
 277                 if (walk_state->deferred_node) {
 278
 279                         /* This name is already in the namespace, get the node */
 280
 281                         node = walk_state->deferred_node;
 282                         status = AE_OK;
 283                         break;
 284                 }
 285
 286                 flags = ACPI_NS_NO_UPSEARCH;
 287                 if (walk_state->pass_number == ACPI_IMODE_EXECUTE) {
 288
 289                         /* Execution mode, node cannot already exist, node is temporary */
 290
 291                         flags |= ACPI_NS_ERROR_IF_FOUND;
 292
 293                         if (!
 294                             (walk_state->
 295                              parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 296                                 flags |= ACPI_NS_TEMPORARY;
 297                         }
 298                 }
 299
 300                 /* Add new entry or lookup existing entry */
 301
 302                 status =
 303                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 304                                    object_type, ACPI_IMODE_LOAD_PASS2, flags,
 305                                    walk_state, &node);
 306
 307                 if (ACPI_SUCCESS(status) && (flags & ACPI_NS_TEMPORARY)) {
 308                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 309                                           "***New Node [%4.4s] %p is temporary\n",
 310                                           acpi_ut_get_node_name(node), node));
 311                 }
 312                 break;
 313         }
 314
 315         if (ACPI_FAILURE(status)) {
 316                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 317                 return_ACPI_STATUS(status);
 318         }
 319
 320         if (!op) {
 321
 322                 /* Create a new op */
 323
 324                 op = acpi_ps_alloc_op(walk_state->opcode);
 325                 if (!op) {
 326                         return_ACPI_STATUS(AE_NO_MEMORY);
 327                 }
 328
 329                 /* Initialize the new op */
 330
 331                 if (node) {
 332                         op->named.name = node->name.integer;
 333                 }
 334                 *out_op = op;
 335         }
 336
 337         /*
 338          * Put the Node in the "op" object that the parser uses, so we
 339          * can get it again quickly when this scope is closed
 340          */
 341         op->common.node = node;
 342         return_ACPI_STATUS(status);
 343 }
 344
 345 /*******************************************************************************
 346  *
 347  * FUNCTION:    acpi_ds_load2_end_op
 348  *
 349  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 350  *
 351  * RETURN:      Status
 352  *
 353  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 354  *              both control methods and everything else.
 355  *
 356  ******************************************************************************/
 357
 358 acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 359 {
 360         union acpi_parse_object *op;
 361         acpi_status status = AE_OK;
 362         acpi_object_type object_type;
 363         struct acpi_namespace_node *node;
 364         union acpi_parse_object *arg;
 365         struct acpi_namespace_node *new_node;
 366 #ifndef ACPI_NO_METHOD_EXECUTION
 367         u32 i;
 368         u8 region_space;
 369 #endif
 370
 371         ACPI_FUNCTION_TRACE(ds_load2_end_op);
 372
 373         op = walk_state->op;
 374         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
 375                           walk_state->op_info->name, op, walk_state));
 376
 377         /* Check if opcode had an associated namespace object */
 378
 379         if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
 380                 return_ACPI_STATUS(AE_OK);
 381         }
 382
 383         if (op->common.aml_opcode == AML_SCOPE_OP) {
 384                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 385                                   "Ending scope Op=%p State=%p\n", op,
 386                                   walk_state));
 387         }
 388
 389         object_type = walk_state->op_info->object_type;
 390
 391         /*
 392          * Get the Node/name from the earlier lookup
 393          * (It was saved in the *op structure)
 394          */
 395         node = op->common.node;
 396
 397         /*
 398          * Put the Node on the object stack (Contains the ACPI Name of
 399          * this object)
 400          */
 401         walk_state->operands[0] = (void *)node;
 402         walk_state->num_operands = 1;
 403
 404         /* Pop the scope stack */
 405
 406         if (acpi_ns_opens_scope(object_type) &&
 407             (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
 408                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 409                                   "(%s) Popping scope for Op %p\n",
 410                                   acpi_ut_get_type_name(object_type), op));
 411
 412                 status = acpi_ds_scope_stack_pop(walk_state);
 413                 if (ACPI_FAILURE(status)) {
 414                         goto cleanup;
 415                 }
 416         }
 417
 418         /*
 419          * Named operations are as follows:
 420          *
 421          * AML_ALIAS
 422          * AML_BANKFIELD
 423          * AML_CREATEBITFIELD
 424          * AML_CREATEBYTEFIELD
 425          * AML_CREATEDWORDFIELD
 426          * AML_CREATEFIELD
 427          * AML_CREATEQWORDFIELD
 428          * AML_CREATEWORDFIELD
 429          * AML_DATA_REGION
 430          * AML_DEVICE
 431          * AML_EVENT
 432          * AML_FIELD
 433          * AML_INDEXFIELD
 434          * AML_METHOD
 435          * AML_METHODCALL
 436          * AML_MUTEX
 437          * AML_NAME
 438          * AML_NAMEDFIELD
 439          * AML_OPREGION
 440          * AML_POWERRES
 441          * AML_PROCESSOR
 442          * AML_SCOPE
 443          * AML_THERMALZONE
 444          */
 445
 446         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 447                           "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
 448                           acpi_ps_get_opcode_name(op->common.aml_opcode),
 449                           walk_state, op, node));
 450
 451         /* Decode the opcode */
 452
 453         arg = op->common.value.arg;
 454
 455         switch (walk_state->op_info->type) {
 456 #ifndef ACPI_NO_METHOD_EXECUTION
 457
 458         case AML_TYPE_CREATE_FIELD:
 459                 /*
 460                  * Create the field object, but the field buffer and index must
 461                  * be evaluated later during the execution phase
 462                  */
 463                 status = acpi_ds_create_buffer_field(op, walk_state);
 464                 break;
 465
 466         case AML_TYPE_NAMED_FIELD:
 467                 /*
 468                  * If we are executing a method, initialize the field
 469                  */
 470                 if (walk_state->method_node) {
 471                         status = acpi_ds_init_field_objects(op, walk_state);
 472                 }
 473
 474                 switch (op->common.aml_opcode) {
 475                 case AML_INDEX_FIELD_OP:
 476
 477                         status =
 478                             acpi_ds_create_index_field(op,
 479                                                        (acpi_handle) arg->
 480                                                        common.node, walk_state);
 481                         break;
 482
 483                 case AML_BANK_FIELD_OP:
 484
 485                         status =
 486                             acpi_ds_create_bank_field(op, arg->common.node,
 487                                                       walk_state);
 488                         break;
 489
 490                 case AML_FIELD_OP:
 491
 492                         status =
 493                             acpi_ds_create_field(op, arg->common.node,
 494                                                  walk_state);
 495                         break;
 496
 497                 default:
 498                         /* All NAMED_FIELD opcodes must be handled above */
 499                         break;
 500                 }
 501                 break;
 502
 503         case AML_TYPE_NAMED_SIMPLE:
 504
 505                 status = acpi_ds_create_operands(walk_state, arg);
 506                 if (ACPI_FAILURE(status)) {
 507                         goto cleanup;
 508                 }
 509
 510                 switch (op->common.aml_opcode) {
 511                 case AML_PROCESSOR_OP:
 512
 513                         status = acpi_ex_create_processor(walk_state);
 514                         break;
 515
 516                 case AML_POWER_RES_OP:
 517
 518                         status = acpi_ex_create_power_resource(walk_state);
 519                         break;
 520
 521                 case AML_MUTEX_OP:
 522
 523                         status = acpi_ex_create_mutex(walk_state);
 524                         break;
 525
 526                 case AML_EVENT_OP:
 527
 528                         status = acpi_ex_create_event(walk_state);
 529                         break;
 530
 531                 case AML_ALIAS_OP:
 532
 533                         status = acpi_ex_create_alias(walk_state);
 534                         break;
 535
 536                 default:
 537                         /* Unknown opcode */
 538
 539                         status = AE_OK;
 540                         goto cleanup;
 541                 }
 542
 543                 /* Delete operands */
 544
 545                 for (i = 1; i < walk_state->num_operands; i++) {
 546                         acpi_ut_remove_reference(walk_state->operands[i]);
 547                         walk_state->operands[i] = NULL;
 548                 }
 549
 550                 break;
 551 #endif                          /* ACPI_NO_METHOD_EXECUTION */
 552
 553         case AML_TYPE_NAMED_COMPLEX:
 554
 555                 switch (op->common.aml_opcode) {
 556 #ifndef ACPI_NO_METHOD_EXECUTION
 557                 case AML_REGION_OP:
 558                 case AML_DATA_REGION_OP:
 559
 560                         if (op->common.aml_opcode == AML_REGION_OP) {
 561                                 region_space = (acpi_adr_space_type)
 562                                     ((op->common.value.arg)->common.value.
 563                                      integer);
 564                         } else {
 565                                 region_space = ACPI_ADR_SPACE_DATA_TABLE;
 566                         }
 567
 568                         /*
 569                          * The op_region is not fully parsed at this time. The only valid
 570                          * argument is the space_id. (We must save the address of the
 571                          * AML of the address and length operands)
 572                          *
 573                          * If we have a valid region, initialize it. The namespace is
 574                          * unlocked at this point.
 575                          *
 576                          * Need to unlock interpreter if it is locked (if we are running
 577                          * a control method), in order to allow _REG methods to be run
 578                          * during acpi_ev_initialize_region.
 579                          */
 580                         if (walk_state->method_node) {
 581                                 /*
 582                                  * Executing a method: initialize the region and unlock
 583                                  * the interpreter
 584                                  */
 585                                 status =
 586                                     acpi_ex_create_region(op->named.data,
 587                                                           op->named.length,
 588                                                           region_space,
 589                                                           walk_state);
 590                                 if (ACPI_FAILURE(status)) {
 591                                         return (status);
 592                                 }
 593
 594                                 acpi_ex_exit_interpreter();
 595                         }
 596
 597                         status =
 598                             acpi_ev_initialize_region
 599                             (acpi_ns_get_attached_object(node), FALSE);
 600                         if (walk_state->method_node) {
 601                                 acpi_ex_enter_interpreter();
 602                         }
 603
 604                         if (ACPI_FAILURE(status)) {
 605                                 /*
 606                                  *  If AE_NOT_EXIST is returned, it is not fatal
 607                                  *  because many regions get created before a handler
 608                                  *  is installed for said region.
 609                                  */
 610                                 if (AE_NOT_EXIST == status) {
 611                                         status = AE_OK;
 612                                 }
 613                         }
 614                         break;
 615
 616                 case AML_NAME_OP:
 617
 618                         status = acpi_ds_create_node(walk_state, node, op);
 619                         break;
 620
 621                 case AML_METHOD_OP:
 622                         /*
 623                          * method_op pkg_length name_string method_flags term_list
 624                          *
 625                          * Note: We must create the method node/object pair as soon as we
 626                          * see the method declaration. This allows later pass1 parsing
 627                          * of invocations of the method (need to know the number of
 628                          * arguments.)
 629                          */
 630                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 631                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 632                                           walk_state, op, op->named.node));
 633
 634                         if (!acpi_ns_get_attached_object(op->named.node)) {
 635                                 walk_state->operands[0] =
 636                                     ACPI_CAST_PTR(void, op->named.node);
 637                                 walk_state->num_operands = 1;
 638
 639                                 status =
 640                                     acpi_ds_create_operands(walk_state,
 641                                                             op->common.value.
 642                                                             arg);
 643                                 if (ACPI_SUCCESS(status)) {
 644                                         status =
 645                                             acpi_ex_create_method(op->named.
 646                                                                   data,
 647                                                                   op->named.
 648                                                                   length,
 649                                                                   walk_state);
 650                                 }
 651                                 walk_state->operands[0] = NULL;
 652                                 walk_state->num_operands = 0;
 653
 654                                 if (ACPI_FAILURE(status)) {
 655                                         return_ACPI_STATUS(status);
 656                                 }
 657                         }
 658                         break;
 659
 660 #endif                          /* ACPI_NO_METHOD_EXECUTION */
 661
 662                 default:
 663                         /* All NAMED_COMPLEX opcodes must be handled above */
 664                         break;
 665                 }
 666                 break;
 667
 668         case AML_CLASS_INTERNAL:
 669
 670                 /* case AML_INT_NAMEPATH_OP: */
 671                 break;
 672
 673         case AML_CLASS_METHOD_CALL:
 674
 675                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 676                                   "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
 677                                   walk_state, op, node));
 678
 679                 /*
 680                  * Lookup the method name and save the Node
 681                  */
 682                 status =
 683                     acpi_ns_lookup(walk_state->scope_info,
 684                                    arg->common.value.string, ACPI_TYPE_ANY,
 685                                    ACPI_IMODE_LOAD_PASS2,
 686                                    ACPI_NS_SEARCH_PARENT |
 687                                    ACPI_NS_DONT_OPEN_SCOPE, walk_state,
 688                                    &(new_node));
 689                 if (ACPI_SUCCESS(status)) {
 690                         /*
 691                          * Make sure that what we found is indeed a method
 692                          * We didn't search for a method on purpose, to see if the name
 693                          * would resolve
 694                          */
 695                         if (new_node->type != ACPI_TYPE_METHOD) {
 696                                 status = AE_AML_OPERAND_TYPE;
 697                         }
 698
 699                         /* We could put the returned object (Node) on the object stack for
 700                          * later, but for now, we will put it in the "op" object that the
 701                          * parser uses, so we can get it again at the end of this scope
 702                          */
 703                         op->common.node = new_node;
 704                 } else {
 705                         ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 706                 }
 707                 break;
 708
 709         default:
 710                 break;
 711         }
 712
 713       cleanup:
 714
 715         /* Remove the Node pushed at the very beginning */
 716
 717         walk_state->operands[0] = NULL;
 718         walk_state->num_operands = 0;
 719         return_ACPI_STATUS(status);
 720 }