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 - 2016, 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",
 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                 case ACPI_TYPE_METHOD:
 234
 235                         /*
 236                          * Allow scope change to root during execution of module-level
 237                          * code. Root is typed METHOD during this time.
 238                          */
 239                         if ((node == acpi_gbl_root_node) &&
 240                             (walk_state->
 241                              parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 242                                 break;
 243                         }
 244
 245                         /*lint -fallthrough */
 246
 247                 default:
 248
 249                         /* All other types are an error */
 250
 251                         ACPI_ERROR((AE_INFO,
 252                                     "Invalid type (%s) for target of "
 253                                     "Scope operator [%4.4s] (Cannot override)",
 254                                     acpi_ut_get_type_name(node->type),
 255                                     acpi_ut_get_node_name(node)));
 256
 257                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 258                 }
 259                 break;
 260
 261         default:
 262
 263                 /* All other opcodes */
 264
 265                 if (op && op->common.node) {
 266
 267                         /* This op/node was previously entered into the namespace */
 268
 269                         node = op->common.node;
 270
 271                         if (acpi_ns_opens_scope(object_type)) {
 272                                 status =
 273                                     acpi_ds_scope_stack_push(node, object_type,
 274                                                              walk_state);
 275                                 if (ACPI_FAILURE(status)) {
 276                                         return_ACPI_STATUS(status);
 277                                 }
 278                         }
 279
 280                         return_ACPI_STATUS(AE_OK);
 281                 }
 282
 283                 /*
 284                  * Enter the named type into the internal namespace. We enter the name
 285                  * as we go downward in the parse tree. Any necessary subobjects that
 286                  * involve arguments to the opcode must be created as we go back up the
 287                  * parse tree later.
 288                  *
 289                  * Note: Name may already exist if we are executing a deferred opcode.
 290                  */
 291                 if (walk_state->deferred_node) {
 292
 293                         /* This name is already in the namespace, get the node */
 294
 295                         node = walk_state->deferred_node;
 296                         status = AE_OK;
 297                         break;
 298                 }
 299
 300                 flags = ACPI_NS_NO_UPSEARCH;
 301                 if (walk_state->pass_number == ACPI_IMODE_EXECUTE) {
 302
 303                         /* Execution mode, node cannot already exist, node is temporary */
 304
 305                         flags |= ACPI_NS_ERROR_IF_FOUND;
 306
 307                         if (!
 308                             (walk_state->
 309                              parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 310                                 flags |= ACPI_NS_TEMPORARY;
 311                         }
 312                 }
 313
 314                 /* Add new entry or lookup existing entry */
 315
 316                 status =
 317                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 318                                    object_type, ACPI_IMODE_LOAD_PASS2, flags,
 319                                    walk_state, &node);
 320
 321                 if (ACPI_SUCCESS(status) && (flags & ACPI_NS_TEMPORARY)) {
 322                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 323                                           "***New Node [%4.4s] %p is temporary\n",
 324                                           acpi_ut_get_node_name(node), node));
 325                 }
 326                 break;
 327         }
 328
 329         if (ACPI_FAILURE(status)) {
 330                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 331                 return_ACPI_STATUS(status);
 332         }
 333
 334         if (!op) {
 335
 336                 /* Create a new op */
 337
 338                 op = acpi_ps_alloc_op(walk_state->opcode, walk_state->aml);
 339                 if (!op) {
 340                         return_ACPI_STATUS(AE_NO_MEMORY);
 341                 }
 342
 343                 /* Initialize the new op */
 344
 345                 if (node) {
 346                         op->named.name = node->name.integer;
 347                 }
 348                 *out_op = op;
 349         }
 350
 351         /*
 352          * Put the Node in the "op" object that the parser uses, so we
 353          * can get it again quickly when this scope is closed
 354          */
 355         op->common.node = node;
 356         return_ACPI_STATUS(status);
 357 }
 358
 359 /*******************************************************************************
 360  *
 361  * FUNCTION:    acpi_ds_load2_end_op
 362  *
 363  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 364  *
 365  * RETURN:      Status
 366  *
 367  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 368  *              both control methods and everything else.
 369  *
 370  ******************************************************************************/
 371
 372 acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 373 {
 374         union acpi_parse_object *op;
 375         acpi_status status = AE_OK;
 376         acpi_object_type object_type;
 377         struct acpi_namespace_node *node;
 378         union acpi_parse_object *arg;
 379         struct acpi_namespace_node *new_node;
 380 #ifndef ACPI_NO_METHOD_EXECUTION
 381         u32 i;
 382         u8 region_space;
 383 #endif
 384
 385         ACPI_FUNCTION_TRACE(ds_load2_end_op);
 386
 387         op = walk_state->op;
 388         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
 389                           walk_state->op_info->name, op, walk_state));
 390
 391         /* Check if opcode had an associated namespace object */
 392
 393         if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
 394                 return_ACPI_STATUS(AE_OK);
 395         }
 396
 397         if (op->common.aml_opcode == AML_SCOPE_OP) {
 398                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 399                                   "Ending scope Op=%p State=%p\n", op,
 400                                   walk_state));
 401         }
 402
 403         object_type = walk_state->op_info->object_type;
 404
 405         /*
 406          * Get the Node/name from the earlier lookup
 407          * (It was saved in the *op structure)
 408          */
 409         node = op->common.node;
 410
 411         /*
 412          * Put the Node on the object stack (Contains the ACPI Name of
 413          * this object)
 414          */
 415         walk_state->operands[0] = (void *)node;
 416         walk_state->num_operands = 1;
 417
 418         /* Pop the scope stack */
 419
 420         if (acpi_ns_opens_scope(object_type) &&
 421             (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
 422                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 423                                   "(%s) Popping scope for Op %p\n",
 424                                   acpi_ut_get_type_name(object_type), op));
 425
 426                 status = acpi_ds_scope_stack_pop(walk_state);
 427                 if (ACPI_FAILURE(status)) {
 428                         goto cleanup;
 429                 }
 430         }
 431
 432         /*
 433          * Named operations are as follows:
 434          *
 435          * AML_ALIAS
 436          * AML_BANKFIELD
 437          * AML_CREATEBITFIELD
 438          * AML_CREATEBYTEFIELD
 439          * AML_CREATEDWORDFIELD
 440          * AML_CREATEFIELD
 441          * AML_CREATEQWORDFIELD
 442          * AML_CREATEWORDFIELD
 443          * AML_DATA_REGION
 444          * AML_DEVICE
 445          * AML_EVENT
 446          * AML_FIELD
 447          * AML_INDEXFIELD
 448          * AML_METHOD
 449          * AML_METHODCALL
 450          * AML_MUTEX
 451          * AML_NAME
 452          * AML_NAMEDFIELD
 453          * AML_OPREGION
 454          * AML_POWERRES
 455          * AML_PROCESSOR
 456          * AML_SCOPE
 457          * AML_THERMALZONE
 458          */
 459
 460         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 461                           "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
 462                           acpi_ps_get_opcode_name(op->common.aml_opcode),
 463                           walk_state, op, node));
 464
 465         /* Decode the opcode */
 466
 467         arg = op->common.value.arg;
 468
 469         switch (walk_state->op_info->type) {
 470 #ifndef ACPI_NO_METHOD_EXECUTION
 471
 472         case AML_TYPE_CREATE_FIELD:
 473                 /*
 474                  * Create the field object, but the field buffer and index must
 475                  * be evaluated later during the execution phase
 476                  */
 477                 status = acpi_ds_create_buffer_field(op, walk_state);
 478                 break;
 479
 480         case AML_TYPE_NAMED_FIELD:
 481                 /*
 482                  * If we are executing a method, initialize the field
 483                  */
 484                 if (walk_state->method_node) {
 485                         status = acpi_ds_init_field_objects(op, walk_state);
 486                 }
 487
 488                 switch (op->common.aml_opcode) {
 489                 case AML_INDEX_FIELD_OP:
 490
 491                         status =
 492                             acpi_ds_create_index_field(op,
 493                                                        (acpi_handle)arg->common.
 494                                                        node, walk_state);
 495                         break;
 496
 497                 case AML_BANK_FIELD_OP:
 498
 499                         status =
 500                             acpi_ds_create_bank_field(op, arg->common.node,
 501                                                       walk_state);
 502                         break;
 503
 504                 case AML_FIELD_OP:
 505
 506                         status =
 507                             acpi_ds_create_field(op, arg->common.node,
 508                                                  walk_state);
 509                         break;
 510
 511                 default:
 512
 513                         /* All NAMED_FIELD opcodes must be handled above */
 514                         break;
 515                 }
 516                 break;
 517
 518         case AML_TYPE_NAMED_SIMPLE:
 519
 520                 status = acpi_ds_create_operands(walk_state, arg);
 521                 if (ACPI_FAILURE(status)) {
 522                         goto cleanup;
 523                 }
 524
 525                 switch (op->common.aml_opcode) {
 526                 case AML_PROCESSOR_OP:
 527
 528                         status = acpi_ex_create_processor(walk_state);
 529                         break;
 530
 531                 case AML_POWER_RES_OP:
 532
 533                         status = acpi_ex_create_power_resource(walk_state);
 534                         break;
 535
 536                 case AML_MUTEX_OP:
 537
 538                         status = acpi_ex_create_mutex(walk_state);
 539                         break;
 540
 541                 case AML_EVENT_OP:
 542
 543                         status = acpi_ex_create_event(walk_state);
 544                         break;
 545
 546                 case AML_ALIAS_OP:
 547
 548                         status = acpi_ex_create_alias(walk_state);
 549                         break;
 550
 551                 default:
 552
 553                         /* Unknown opcode */
 554
 555                         status = AE_OK;
 556                         goto cleanup;
 557                 }
 558
 559                 /* Delete operands */
 560
 561                 for (i = 1; i < walk_state->num_operands; i++) {
 562                         acpi_ut_remove_reference(walk_state->operands[i]);
 563                         walk_state->operands[i] = NULL;
 564                 }
 565
 566                 break;
 567 #endif                          /* ACPI_NO_METHOD_EXECUTION */
 568
 569         case AML_TYPE_NAMED_COMPLEX:
 570
 571                 switch (op->common.aml_opcode) {
 572 #ifndef ACPI_NO_METHOD_EXECUTION
 573                 case AML_REGION_OP:
 574                 case AML_DATA_REGION_OP:
 575
 576                         if (op->common.aml_opcode == AML_REGION_OP) {
 577                                 region_space = (acpi_adr_space_type)
 578                                     ((op->common.value.arg)->common.value.
 579                                      integer);
 580                         } else {
 581                                 region_space = ACPI_ADR_SPACE_DATA_TABLE;
 582                         }
 583
 584                         /*
 585                          * The op_region is not fully parsed at this time. The only valid
 586                          * argument is the space_id. (We must save the address of the
 587                          * AML of the address and length operands)
 588                          *
 589                          * If we have a valid region, initialize it. The namespace is
 590                          * unlocked at this point.
 591                          *
 592                          * Need to unlock interpreter if it is locked (if we are running
 593                          * a control method), in order to allow _REG methods to be run
 594                          * during acpi_ev_initialize_region.
 595                          */
 596                         if (walk_state->method_node) {
 597                                 /*
 598                                  * Executing a method: initialize the region and unlock
 599                                  * the interpreter
 600                                  */
 601                                 status = acpi_ex_create_region(op->named.data,
 602                                                                op->named.length,
 603                                                                region_space,
 604                                                                walk_state);
 605                                 if (ACPI_FAILURE(status)) {
 606                                         return_ACPI_STATUS(status);
 607                                 }
 608                         }
 609
 610                         status =
 611                             acpi_ev_initialize_region
 612                             (acpi_ns_get_attached_object(node), FALSE);
 613
 614                         if (ACPI_FAILURE(status)) {
 615                                 /*
 616                                  *  If AE_NOT_EXIST is returned, it is not fatal
 617                                  *  because many regions get created before a handler
 618                                  *  is installed for said region.
 619                                  */
 620                                 if (AE_NOT_EXIST == status) {
 621                                         status = AE_OK;
 622                                 }
 623                         }
 624                         break;
 625
 626                 case AML_NAME_OP:
 627
 628                         status = acpi_ds_create_node(walk_state, node, op);
 629                         break;
 630
 631                 case AML_METHOD_OP:
 632                         /*
 633                          * method_op pkg_length name_string method_flags term_list
 634                          *
 635                          * Note: We must create the method node/object pair as soon as we
 636                          * see the method declaration. This allows later pass1 parsing
 637                          * of invocations of the method (need to know the number of
 638                          * arguments.)
 639                          */
 640                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 641                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 642                                           walk_state, op, op->named.node));
 643
 644                         if (!acpi_ns_get_attached_object(op->named.node)) {
 645                                 walk_state->operands[0] =
 646                                     ACPI_CAST_PTR(void, op->named.node);
 647                                 walk_state->num_operands = 1;
 648
 649                                 status =
 650                                     acpi_ds_create_operands(walk_state,
 651                                                             op->common.value.
 652                                                             arg);
 653                                 if (ACPI_SUCCESS(status)) {
 654                                         status =
 655                                             acpi_ex_create_method(op->named.
 656                                                                   data,
 657                                                                   op->named.
 658                                                                   length,
 659                                                                   walk_state);
 660                                 }
 661
 662                                 walk_state->operands[0] = NULL;
 663                                 walk_state->num_operands = 0;
 664
 665                                 if (ACPI_FAILURE(status)) {
 666                                         return_ACPI_STATUS(status);
 667                                 }
 668                         }
 669                         break;
 670
 671 #endif                          /* ACPI_NO_METHOD_EXECUTION */
 672
 673                 default:
 674
 675                         /* All NAMED_COMPLEX opcodes must be handled above */
 676                         break;
 677                 }
 678                 break;
 679
 680         case AML_CLASS_INTERNAL:
 681
 682                 /* case AML_INT_NAMEPATH_OP: */
 683                 break;
 684
 685         case AML_CLASS_METHOD_CALL:
 686
 687                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 688                                   "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
 689                                   walk_state, op, node));
 690
 691                 /*
 692                  * Lookup the method name and save the Node
 693                  */
 694                 status =
 695                     acpi_ns_lookup(walk_state->scope_info,
 696                                    arg->common.value.string, ACPI_TYPE_ANY,
 697                                    ACPI_IMODE_LOAD_PASS2,
 698                                    ACPI_NS_SEARCH_PARENT |
 699                                    ACPI_NS_DONT_OPEN_SCOPE, walk_state,
 700                                    &(new_node));
 701                 if (ACPI_SUCCESS(status)) {
 702                         /*
 703                          * Make sure that what we found is indeed a method
 704                          * We didn't search for a method on purpose, to see if the name
 705                          * would resolve
 706                          */
 707                         if (new_node->type != ACPI_TYPE_METHOD) {
 708                                 status = AE_AML_OPERAND_TYPE;
 709                         }
 710
 711                         /* We could put the returned object (Node) on the object stack for
 712                          * later, but for now, we will put it in the "op" object that the
 713                          * parser uses, so we can get it again at the end of this scope
 714                          */
 715                         op->common.node = new_node;
 716                 } else {
 717                         ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 718                 }
 719                 break;
 720
 721         default:
 722
 723                 break;
 724         }
 725
 726 cleanup:
 727
 728         /* Remove the Node pushed at the very beginning */
 729
 730         walk_state->operands[0] = NULL;
 731         walk_state->num_operands = 0;
 732         return_ACPI_STATUS(status);
 733 }