drivers/acpi/acpica/nsaccess.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /*******************************************************************************
   3  *
   4  * Module Name: nsaccess - Top-level functions for accessing ACPI namespace
   5  *
   6  ******************************************************************************/
   7
   8 #include <acpi/acpi.h>
   9 #include "accommon.h"
  10 #include "amlcode.h"
  11 #include "acnamesp.h"
  12 #include "acdispat.h"
  13
  14 #ifdef ACPI_ASL_COMPILER
  15 #include "acdisasm.h"
  16 #endif
  17
  18 #define _COMPONENT          ACPI_NAMESPACE
  19 ACPI_MODULE_NAME("nsaccess")
  20
  21 /*******************************************************************************
  22  *
  23  * FUNCTION:    acpi_ns_root_initialize
  24  *
  25  * PARAMETERS:  None
  26  *
  27  * RETURN:      Status
  28  *
  29  * DESCRIPTION: Allocate and initialize the default root named objects
  30  *
  31  * MUTEX:       Locks namespace for entire execution
  32  *
  33  ******************************************************************************/
  34 acpi_status acpi_ns_root_initialize(void)
  35 {
  36         acpi_status status;
  37         const struct acpi_predefined_names *init_val = NULL;
  38         struct acpi_namespace_node *new_node;
  39         union acpi_operand_object *obj_desc;
  40         acpi_string val = NULL;
  41
  42         ACPI_FUNCTION_TRACE(ns_root_initialize);
  43
  44         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  45         if (ACPI_FAILURE(status)) {
  46                 return_ACPI_STATUS(status);
  47         }
  48
  49         /*
  50          * The global root ptr is initially NULL, so a non-NULL value indicates
  51          * that acpi_ns_root_initialize() has already been called; just return.
  52          */
  53         if (acpi_gbl_root_node) {
  54                 status = AE_OK;
  55                 goto unlock_and_exit;
  56         }
  57
  58         /*
  59          * Tell the rest of the subsystem that the root is initialized
  60          * (This is OK because the namespace is locked)
  61          */
  62         acpi_gbl_root_node = &acpi_gbl_root_node_struct;
  63
  64         /* Enter the pre-defined names in the name table */
  65
  66         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  67                           "Entering predefined entries into namespace\n"));
  68
  69         for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) {
  70
  71                 /* _OSI is optional for now, will be permanent later */
  72
  73                 if (!strcmp(init_val->name, "_OSI")
  74                     && !acpi_gbl_create_osi_method) {
  75                         continue;
  76                 }
  77
  78                 status =
  79                     acpi_ns_lookup(NULL, ACPI_CAST_PTR(char, init_val->name),
  80                                    init_val->type, ACPI_IMODE_LOAD_PASS2,
  81                                    ACPI_NS_NO_UPSEARCH, NULL, &new_node);
  82                 if (ACPI_FAILURE(status)) {
  83                         ACPI_EXCEPTION((AE_INFO, status,
  84                                         "Could not create predefined name %s",
  85                                         init_val->name));
  86                         continue;
  87                 }
  88
  89                 /*
  90                  * Name entered successfully. If entry in pre_defined_names[] specifies
  91                  * an initial value, create the initial value.
  92                  */
  93                 if (init_val->val) {
  94                         status = acpi_os_predefined_override(init_val, &val);
  95                         if (ACPI_FAILURE(status)) {
  96                                 ACPI_ERROR((AE_INFO,
  97                                             "Could not override predefined %s",
  98                                             init_val->name));
  99                         }
 100
 101                         if (!val) {
 102                                 val = init_val->val;
 103                         }
 104
 105                         /*
 106                          * Entry requests an initial value, allocate a
 107                          * descriptor for it.
 108                          */
 109                         obj_desc =
 110                             acpi_ut_create_internal_object(init_val->type);
 111                         if (!obj_desc) {
 112                                 status = AE_NO_MEMORY;
 113                                 goto unlock_and_exit;
 114                         }
 115
 116                         /*
 117                          * Convert value string from table entry to
 118                          * internal representation. Only types actually
 119                          * used for initial values are implemented here.
 120                          */
 121                         switch (init_val->type) {
 122                         case ACPI_TYPE_METHOD:
 123
 124                                 obj_desc->method.param_count =
 125                                     (u8) ACPI_TO_INTEGER(val);
 126                                 obj_desc->common.flags |= AOPOBJ_DATA_VALID;
 127
 128 #if defined (ACPI_ASL_COMPILER)
 129
 130                                 /* Save the parameter count for the iASL compiler */
 131
 132                                 new_node->value = obj_desc->method.param_count;
 133 #else
 134                                 /* Mark this as a very SPECIAL method */
 135
 136                                 obj_desc->method.info_flags =
 137                                     ACPI_METHOD_INTERNAL_ONLY;
 138                                 obj_desc->method.dispatch.implementation =
 139                                     acpi_ut_osi_implementation;
 140 #endif
 141                                 break;
 142
 143                         case ACPI_TYPE_INTEGER:
 144
 145                                 obj_desc->integer.value = ACPI_TO_INTEGER(val);
 146                                 break;
 147
 148                         case ACPI_TYPE_STRING:
 149
 150                                 /* Build an object around the static string */
 151
 152                                 obj_desc->string.length = (u32)strlen(val);
 153                                 obj_desc->string.pointer = val;
 154                                 obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
 155                                 break;
 156
 157                         case ACPI_TYPE_MUTEX:
 158
 159                                 obj_desc->mutex.node = new_node;
 160                                 obj_desc->mutex.sync_level =
 161                                     (u8) (ACPI_TO_INTEGER(val) - 1);
 162
 163                                 /* Create a mutex */
 164
 165                                 status =
 166                                     acpi_os_create_mutex(&obj_desc->mutex.
 167                                                          os_mutex);
 168                                 if (ACPI_FAILURE(status)) {
 169                                         acpi_ut_remove_reference(obj_desc);
 170                                         goto unlock_and_exit;
 171                                 }
 172
 173                                 /* Special case for ACPI Global Lock */
 174
 175                                 if (strcmp(init_val->name, "_GL_") == 0) {
 176                                         acpi_gbl_global_lock_mutex = obj_desc;
 177
 178                                         /* Create additional counting semaphore for global lock */
 179
 180                                         status =
 181                                             acpi_os_create_semaphore(1, 0,
 182                                                                      &acpi_gbl_global_lock_semaphore);
 183                                         if (ACPI_FAILURE(status)) {
 184                                                 acpi_ut_remove_reference
 185                                                     (obj_desc);
 186                                                 goto unlock_and_exit;
 187                                         }
 188                                 }
 189                                 break;
 190
 191                         default:
 192
 193                                 ACPI_ERROR((AE_INFO,
 194                                             "Unsupported initial type value 0x%X",
 195                                             init_val->type));
 196                                 acpi_ut_remove_reference(obj_desc);
 197                                 obj_desc = NULL;
 198                                 continue;
 199                         }
 200
 201                         /* Store pointer to value descriptor in the Node */
 202
 203                         status = acpi_ns_attach_object(new_node, obj_desc,
 204                                                        obj_desc->common.type);
 205
 206                         /* Remove local reference to the object */
 207
 208                         acpi_ut_remove_reference(obj_desc);
 209                 }
 210         }
 211
 212 unlock_and_exit:
 213         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 214
 215         /* Save a handle to "_GPE", it is always present */
 216
 217         if (ACPI_SUCCESS(status)) {
 218                 status = acpi_ns_get_node(NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH,
 219                                           &acpi_gbl_fadt_gpe_device);
 220         }
 221
 222         return_ACPI_STATUS(status);
 223 }
 224
 225 /*******************************************************************************
 226  *
 227  * FUNCTION:    acpi_ns_lookup
 228  *
 229  * PARAMETERS:  scope_info      - Current scope info block
 230  *              pathname        - Search pathname, in internal format
 231  *                                (as represented in the AML stream)
 232  *              type            - Type associated with name
 233  *              interpreter_mode - IMODE_LOAD_PASS2 => add name if not found
 234  *              flags           - Flags describing the search restrictions
 235  *              walk_state      - Current state of the walk
 236  *              return_node     - Where the Node is placed (if found
 237  *                                or created successfully)
 238  *
 239  * RETURN:      Status
 240  *
 241  * DESCRIPTION: Find or enter the passed name in the name space.
 242  *              Log an error if name not found in Exec mode.
 243  *
 244  * MUTEX:       Assumes namespace is locked.
 245  *
 246  ******************************************************************************/
 247
 248 acpi_status
 249 acpi_ns_lookup(union acpi_generic_state *scope_info,
 250                char *pathname,
 251                acpi_object_type type,
 252                acpi_interpreter_mode interpreter_mode,
 253                u32 flags,
 254                struct acpi_walk_state *walk_state,
 255                struct acpi_namespace_node **return_node)
 256 {
 257         acpi_status status;
 258         char *path = pathname;
 259         char *external_path;
 260         struct acpi_namespace_node *prefix_node;
 261         struct acpi_namespace_node *current_node = NULL;
 262         struct acpi_namespace_node *this_node = NULL;
 263         u32 num_segments;
 264         u32 num_carats;
 265         acpi_name simple_name;
 266         acpi_object_type type_to_check_for;
 267         acpi_object_type this_search_type;
 268         u32 search_parent_flag = ACPI_NS_SEARCH_PARENT;
 269         u32 local_flags;
 270         acpi_interpreter_mode local_interpreter_mode;
 271
 272         ACPI_FUNCTION_TRACE(ns_lookup);
 273
 274         if (!return_node) {
 275                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 276         }
 277
 278         local_flags = flags &
 279             ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND |
 280               ACPI_NS_SEARCH_PARENT);
 281         *return_node = ACPI_ENTRY_NOT_FOUND;
 282         acpi_gbl_ns_lookup_count++;
 283
 284         if (!acpi_gbl_root_node) {
 285                 return_ACPI_STATUS(AE_NO_NAMESPACE);
 286         }
 287
 288         /* Get the prefix scope. A null scope means use the root scope */
 289
 290         if ((!scope_info) || (!scope_info->scope.node)) {
 291                 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 292                                   "Null scope prefix, using root node (%p)\n",
 293                                   acpi_gbl_root_node));
 294
 295                 prefix_node = acpi_gbl_root_node;
 296         } else {
 297                 prefix_node = scope_info->scope.node;
 298                 if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) !=
 299                     ACPI_DESC_TYPE_NAMED) {
 300                         ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]",
 301                                     prefix_node,
 302                                     acpi_ut_get_descriptor_name(prefix_node)));
 303                         return_ACPI_STATUS(AE_AML_INTERNAL);
 304                 }
 305
 306                 if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) {
 307                         /*
 308                          * This node might not be a actual "scope" node (such as a
 309                          * Device/Method, etc.)  It could be a Package or other object
 310                          * node. Backup up the tree to find the containing scope node.
 311                          */
 312                         while (!acpi_ns_opens_scope(prefix_node->type) &&
 313                                prefix_node->type != ACPI_TYPE_ANY) {
 314                                 prefix_node = prefix_node->parent;
 315                         }
 316                 }
 317         }
 318
 319         /* Save type. TBD: may be no longer necessary */
 320
 321         type_to_check_for = type;
 322
 323         /*
 324          * Begin examination of the actual pathname
 325          */
 326         if (!pathname) {
 327
 328                 /* A Null name_path is allowed and refers to the root */
 329
 330                 num_segments = 0;
 331                 this_node = acpi_gbl_root_node;
 332                 path = "";
 333
 334                 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 335                                   "Null Pathname (Zero segments), Flags=%X\n",
 336                                   flags));
 337         } else {
 338                 /*
 339                  * Name pointer is valid (and must be in internal name format)
 340                  *
 341                  * Check for scope prefixes:
 342                  *
 343                  * As represented in the AML stream, a namepath consists of an
 344                  * optional scope prefix followed by a name segment part.
 345                  *
 346                  * If present, the scope prefix is either a Root Prefix (in
 347                  * which case the name is fully qualified), or one or more
 348                  * Parent Prefixes (in which case the name's scope is relative
 349                  * to the current scope).
 350                  */
 351                 if (*path == (u8) AML_ROOT_PREFIX) {
 352
 353                         /* Pathname is fully qualified, start from the root */
 354
 355                         this_node = acpi_gbl_root_node;
 356                         search_parent_flag = ACPI_NS_NO_UPSEARCH;
 357
 358                         /* Point to name segment part */
 359
 360                         path++;
 361
 362                         ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 363                                           "Path is absolute from root [%p]\n",
 364                                           this_node));
 365                 } else {
 366                         /* Pathname is relative to current scope, start there */
 367
 368                         ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 369                                           "Searching relative to prefix scope [%4.4s] (%p)\n",
 370                                           acpi_ut_get_node_name(prefix_node),
 371                                           prefix_node));
 372
 373                         /*
 374                          * Handle multiple Parent Prefixes (carat) by just getting
 375                          * the parent node for each prefix instance.
 376                          */
 377                         this_node = prefix_node;
 378                         num_carats = 0;
 379                         while (*path == (u8) AML_PARENT_PREFIX) {
 380
 381                                 /* Name is fully qualified, no search rules apply */
 382
 383                                 search_parent_flag = ACPI_NS_NO_UPSEARCH;
 384
 385                                 /*
 386                                  * Point past this prefix to the name segment
 387                                  * part or the next Parent Prefix
 388                                  */
 389                                 path++;
 390
 391                                 /* Backup to the parent node */
 392
 393                                 num_carats++;
 394                                 this_node = this_node->parent;
 395                                 if (!this_node) {
 396                                         /*
 397                                          * Current scope has no parent scope. Externalize
 398                                          * the internal path for error message.
 399                                          */
 400                                         status =
 401                                             acpi_ns_externalize_name
 402                                             (ACPI_UINT32_MAX, pathname, NULL,
 403                                              &external_path);
 404                                         if (ACPI_SUCCESS(status)) {
 405                                                 ACPI_ERROR((AE_INFO,
 406                                                             "%s: Path has too many parent prefixes (^)",
 407                                                             external_path));
 408
 409                                                 ACPI_FREE(external_path);
 410                                         }
 411
 412                                         return_ACPI_STATUS(AE_NOT_FOUND);
 413                                 }
 414                         }
 415
 416                         if (search_parent_flag == ACPI_NS_NO_UPSEARCH) {
 417                                 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 418                                                   "Search scope is [%4.4s], path has %u carat(s)\n",
 419                                                   acpi_ut_get_node_name
 420                                                   (this_node), num_carats));
 421                         }
 422                 }
 423
 424                 /*
 425                  * Determine the number of ACPI name segments in this pathname.
 426                  *
 427                  * The segment part consists of either:
 428                  *  - A Null name segment (0)
 429                  *  - A dual_name_prefix followed by two 4-byte name segments
 430                  *  - A multi_name_prefix followed by a byte indicating the
 431                  *      number of segments and the segments themselves.
 432                  *  - A single 4-byte name segment
 433                  *
 434                  * Examine the name prefix opcode, if any, to determine the number of
 435                  * segments.
 436                  */
 437                 switch (*path) {
 438                 case 0:
 439                         /*
 440                          * Null name after a root or parent prefixes. We already
 441                          * have the correct target node and there are no name segments.
 442                          */
 443                         num_segments = 0;
 444                         type = this_node->type;
 445
 446                         ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 447                                           "Prefix-only Pathname (Zero name segments), Flags=%X\n",
 448                                           flags));
 449                         break;
 450
 451                 case AML_DUAL_NAME_PREFIX:
 452
 453                         /* More than one name_seg, search rules do not apply */
 454
 455                         search_parent_flag = ACPI_NS_NO_UPSEARCH;
 456
 457                         /* Two segments, point to first name segment */
 458
 459                         num_segments = 2;
 460                         path++;
 461
 462                         ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 463                                           "Dual Pathname (2 segments, Flags=%X)\n",
 464                                           flags));
 465                         break;
 466
 467                 case AML_MULTI_NAME_PREFIX:
 468
 469                         /* More than one name_seg, search rules do not apply */
 470
 471                         search_parent_flag = ACPI_NS_NO_UPSEARCH;
 472
 473                         /* Extract segment count, point to first name segment */
 474
 475                         path++;
 476                         num_segments = (u32) (u8) * path;
 477                         path++;
 478
 479                         ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 480                                           "Multi Pathname (%u Segments, Flags=%X)\n",
 481                                           num_segments, flags));
 482                         break;
 483
 484                 default:
 485                         /*
 486                          * Not a Null name, no Dual or Multi prefix, hence there is
 487                          * only one name segment and Pathname is already pointing to it.
 488                          */
 489                         num_segments = 1;
 490
 491                         ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 492                                           "Simple Pathname (1 segment, Flags=%X)\n",
 493                                           flags));
 494                         break;
 495                 }
 496
 497                 ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path));
 498         }
 499
 500         /*
 501          * Search namespace for each segment of the name. Loop through and
 502          * verify (or add to the namespace) each name segment.
 503          *
 504          * The object type is significant only at the last name
 505          * segment. (We don't care about the types along the path, only
 506          * the type of the final target object.)
 507          */
 508         this_search_type = ACPI_TYPE_ANY;
 509         current_node = this_node;
 510
 511         while (num_segments && current_node) {
 512                 num_segments--;
 513                 if (!num_segments) {
 514
 515                         /* This is the last segment, enable typechecking */
 516
 517                         this_search_type = type;
 518
 519                         /*
 520                          * Only allow automatic parent search (search rules) if the caller
 521                          * requested it AND we have a single, non-fully-qualified name_seg
 522                          */
 523                         if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) &&
 524                             (flags & ACPI_NS_SEARCH_PARENT)) {
 525                                 local_flags |= ACPI_NS_SEARCH_PARENT;
 526                         }
 527
 528                         /* Set error flag according to caller */
 529
 530                         if (flags & ACPI_NS_ERROR_IF_FOUND) {
 531                                 local_flags |= ACPI_NS_ERROR_IF_FOUND;
 532                         }
 533
 534                         /* Set override flag according to caller */
 535
 536                         if (flags & ACPI_NS_OVERRIDE_IF_FOUND) {
 537                                 local_flags |= ACPI_NS_OVERRIDE_IF_FOUND;
 538                         }
 539                 }
 540
 541                 /* Handle opcodes that create a new name_seg via a full name_path */
 542
 543                 local_interpreter_mode = interpreter_mode;
 544                 if ((flags & ACPI_NS_PREFIX_MUST_EXIST) && (num_segments > 0)) {
 545
 546                         /* Every element of the path must exist (except for the final name_seg) */
 547
 548                         local_interpreter_mode = ACPI_IMODE_EXECUTE;
 549                 }
 550
 551                 /* Extract one ACPI name from the front of the pathname */
 552
 553                 ACPI_MOVE_32_TO_32(&simple_name, path);
 554
 555                 /* Try to find the single (4 character) ACPI name */
 556
 557                 status =
 558                     acpi_ns_search_and_enter(simple_name, walk_state,
 559                                              current_node,
 560                                              local_interpreter_mode,
 561                                              this_search_type, local_flags,
 562                                              &this_node);
 563                 if (ACPI_FAILURE(status)) {
 564                         if (status == AE_NOT_FOUND) {
 565 #if !defined ACPI_ASL_COMPILER  /* Note: iASL reports this error by itself, not needed here */
 566                                 if (flags & ACPI_NS_PREFIX_MUST_EXIST) {
 567                                         acpi_os_printf(ACPI_MSG_BIOS_ERROR
 568                                                        "Object does not exist: %4.4s\n",
 569                                                        &simple_name);
 570                                 }
 571 #endif
 572                                 /* Name not found in ACPI namespace */
 573
 574                                 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 575                                                   "Name [%4.4s] not found in scope [%4.4s] %p\n",
 576                                                   (char *)&simple_name,
 577                                                   (char *)&current_node->name,
 578                                                   current_node));
 579                         }
 580 #ifdef ACPI_EXEC_APP
 581                         if ((status == AE_ALREADY_EXISTS) &&
 582                             (this_node->flags & ANOBJ_NODE_EARLY_INIT)) {
 583                                 this_node->flags &= ~ANOBJ_NODE_EARLY_INIT;
 584                                 status = AE_OK;
 585                         }
 586 #endif
 587
 588 #ifdef ACPI_ASL_COMPILER
 589                         /*
 590                          * If this ACPI name already exists within the namespace as an
 591                          * external declaration, then mark the external as a conflicting
 592                          * declaration and proceed to process the current node as if it did
 593                          * not exist in the namespace. If this node is not processed as
 594                          * normal, then it could cause improper namespace resolution
 595                          * by failing to open a new scope.
 596                          */
 597                         if (acpi_gbl_disasm_flag &&
 598                             (status == AE_ALREADY_EXISTS) &&
 599                             ((this_node->flags & ANOBJ_IS_EXTERNAL) ||
 600                              (walk_state
 601                               && walk_state->opcode == AML_EXTERNAL_OP))) {
 602                                 this_node->flags &= ~ANOBJ_IS_EXTERNAL;
 603                                 this_node->type = (u8)this_search_type;
 604                                 if (walk_state->opcode != AML_EXTERNAL_OP) {
 605                                         acpi_dm_mark_external_conflict
 606                                             (this_node);
 607                                 }
 608                                 break;
 609                         }
 610 #endif
 611
 612                         *return_node = this_node;
 613                         return_ACPI_STATUS(status);
 614                 }
 615
 616                 /* More segments to follow? */
 617
 618                 if (num_segments > 0) {
 619                         /*
 620                          * If we have an alias to an object that opens a scope (such as a
 621                          * device or processor), we need to dereference the alias here so
 622                          * that we can access any children of the original node (via the
 623                          * remaining segments).
 624                          */
 625                         if (this_node->type == ACPI_TYPE_LOCAL_ALIAS) {
 626                                 if (!this_node->object) {
 627                                         return_ACPI_STATUS(AE_NOT_EXIST);
 628                                 }
 629
 630                                 if (acpi_ns_opens_scope
 631                                     (((struct acpi_namespace_node *)
 632                                       this_node->object)->type)) {
 633                                         this_node =
 634                                             (struct acpi_namespace_node *)
 635                                             this_node->object;
 636                                 }
 637                         }
 638                 }
 639
 640                 /* Special handling for the last segment (num_segments == 0) */
 641
 642                 else {
 643                         /*
 644                          * Sanity typecheck of the target object:
 645                          *
 646                          * If 1) This is the last segment (num_segments == 0)
 647                          *    2) And we are looking for a specific type
 648                          *       (Not checking for TYPE_ANY)
 649                          *    3) Which is not an alias
 650                          *    4) Which is not a local type (TYPE_SCOPE)
 651                          *    5) And the type of target object is known (not TYPE_ANY)
 652                          *    6) And target object does not match what we are looking for
 653                          *
 654                          * Then we have a type mismatch. Just warn and ignore it.
 655                          */
 656                         if ((type_to_check_for != ACPI_TYPE_ANY) &&
 657                             (type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) &&
 658                             (type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS)
 659                             && (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE)
 660                             && (this_node->type != ACPI_TYPE_ANY)
 661                             && (this_node->type != type_to_check_for)) {
 662
 663                                 /* Complain about a type mismatch */
 664
 665                                 ACPI_WARNING((AE_INFO,
 666                                               "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)",
 667                                               ACPI_CAST_PTR(char, &simple_name),
 668                                               acpi_ut_get_type_name(this_node->
 669                                                                     type),
 670                                               acpi_ut_get_type_name
 671                                               (type_to_check_for)));
 672                         }
 673
 674                         /*
 675                          * If this is the last name segment and we are not looking for a
 676                          * specific type, but the type of found object is known, use that
 677                          * type to (later) see if it opens a scope.
 678                          */
 679                         if (type == ACPI_TYPE_ANY) {
 680                                 type = this_node->type;
 681                         }
 682                 }
 683
 684                 /* Point to next name segment and make this node current */
 685
 686                 path += ACPI_NAME_SIZE;
 687                 current_node = this_node;
 688         }
 689
 690         /* Always check if we need to open a new scope */
 691
 692         if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) {
 693                 /*
 694                  * If entry is a type which opens a scope, push the new scope on the
 695                  * scope stack.
 696                  */
 697                 if (acpi_ns_opens_scope(type)) {
 698                         status =
 699                             acpi_ds_scope_stack_push(this_node, type,
 700                                                      walk_state);
 701                         if (ACPI_FAILURE(status)) {
 702                                 return_ACPI_STATUS(status);
 703                         }
 704                 }
 705         }
 706 #ifdef ACPI_EXEC_APP
 707         if (flags & ACPI_NS_EARLY_INIT) {
 708                 this_node->flags |= ANOBJ_NODE_EARLY_INIT;
 709         }
 710 #endif
 711
 712         *return_node = this_node;
 713         return_ACPI_STATUS(AE_OK);
 714 }