drivers/acpi/acpica/nsutils.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
   4  *                        parents and siblings and Scope manipulation
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2013, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acnamesp.h"
  48 #include "amlcode.h"
  49
  50 #define _COMPONENT          ACPI_NAMESPACE
  51 ACPI_MODULE_NAME("nsutils")
  52
  53 /* Local prototypes */
  54 #ifdef ACPI_OBSOLETE_FUNCTIONS
  55 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search);
  56 #endif
  57
  58 /*******************************************************************************
  59  *
  60  * FUNCTION:    acpi_ns_print_node_pathname
  61  *
  62  * PARAMETERS:  node            - Object
  63  *              message         - Prefix message
  64  *
  65  * DESCRIPTION: Print an object's full namespace pathname
  66  *              Manages allocation/freeing of a pathname buffer
  67  *
  68  ******************************************************************************/
  69
  70 void
  71 acpi_ns_print_node_pathname(struct acpi_namespace_node *node,
  72                             const char *message)
  73 {
  74         struct acpi_buffer buffer;
  75         acpi_status status;
  76
  77         if (!node) {
  78                 acpi_os_printf("[NULL NAME]");
  79                 return;
  80         }
  81
  82         /* Convert handle to full pathname and print it (with supplied message) */
  83
  84         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
  85
  86         status = acpi_ns_handle_to_pathname(node, &buffer);
  87         if (ACPI_SUCCESS(status)) {
  88                 if (message) {
  89                         acpi_os_printf("%s ", message);
  90                 }
  91
  92                 acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node);
  93                 ACPI_FREE(buffer.pointer);
  94         }
  95 }
  96
  97 /*******************************************************************************
  98  *
  99  * FUNCTION:    acpi_ns_get_type
 100  *
 101  * PARAMETERS:  node        - Parent Node to be examined
 102  *
 103  * RETURN:      Type field from Node whose handle is passed
 104  *
 105  * DESCRIPTION: Return the type of a Namespace node
 106  *
 107  ******************************************************************************/
 108
 109 acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node)
 110 {
 111         ACPI_FUNCTION_TRACE(ns_get_type);
 112
 113         if (!node) {
 114                 ACPI_WARNING((AE_INFO, "Null Node parameter"));
 115                 return_UINT8(ACPI_TYPE_ANY);
 116         }
 117
 118         return_UINT8(node->type);
 119 }
 120
 121 /*******************************************************************************
 122  *
 123  * FUNCTION:    acpi_ns_local
 124  *
 125  * PARAMETERS:  type        - A namespace object type
 126  *
 127  * RETURN:      LOCAL if names must be found locally in objects of the
 128  *              passed type, 0 if enclosing scopes should be searched
 129  *
 130  * DESCRIPTION: Returns scope rule for the given object type.
 131  *
 132  ******************************************************************************/
 133
 134 u32 acpi_ns_local(acpi_object_type type)
 135 {
 136         ACPI_FUNCTION_TRACE(ns_local);
 137
 138         if (!acpi_ut_valid_object_type(type)) {
 139
 140                 /* Type code out of range  */
 141
 142                 ACPI_WARNING((AE_INFO, "Invalid Object Type 0x%X", type));
 143                 return_UINT32(ACPI_NS_NORMAL);
 144         }
 145
 146         return_UINT32(acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
 147 }
 148
 149 /*******************************************************************************
 150  *
 151  * FUNCTION:    acpi_ns_get_internal_name_length
 152  *
 153  * PARAMETERS:  info            - Info struct initialized with the
 154  *                                external name pointer.
 155  *
 156  * RETURN:      None
 157  *
 158  * DESCRIPTION: Calculate the length of the internal (AML) namestring
 159  *              corresponding to the external (ASL) namestring.
 160  *
 161  ******************************************************************************/
 162
 163 void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
 164 {
 165         const char *next_external_char;
 166         u32 i;
 167
 168         ACPI_FUNCTION_ENTRY();
 169
 170         next_external_char = info->external_name;
 171         info->num_carats = 0;
 172         info->num_segments = 0;
 173         info->fully_qualified = FALSE;
 174
 175         /*
 176          * For the internal name, the required length is 4 bytes per segment, plus
 177          * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
 178          * (which is not really needed, but no there's harm in putting it there)
 179          *
 180          * strlen() + 1 covers the first name_seg, which has no path separator
 181          */
 182         if (ACPI_IS_ROOT_PREFIX(*next_external_char)) {
 183                 info->fully_qualified = TRUE;
 184                 next_external_char++;
 185
 186                 /* Skip redundant root_prefix, like \\_SB.PCI0.SBRG.EC0 */
 187
 188                 while (ACPI_IS_ROOT_PREFIX(*next_external_char)) {
 189                         next_external_char++;
 190                 }
 191         } else {
 192                 /* Handle Carat prefixes */
 193
 194                 while (ACPI_IS_PARENT_PREFIX(*next_external_char)) {
 195                         info->num_carats++;
 196                         next_external_char++;
 197                 }
 198         }
 199
 200         /*
 201          * Determine the number of ACPI name "segments" by counting the number of
 202          * path separators within the string. Start with one segment since the
 203          * segment count is [(# separators) + 1], and zero separators is ok.
 204          */
 205         if (*next_external_char) {
 206                 info->num_segments = 1;
 207                 for (i = 0; next_external_char[i]; i++) {
 208                         if (ACPI_IS_PATH_SEPARATOR(next_external_char[i])) {
 209                                 info->num_segments++;
 210                         }
 211                 }
 212         }
 213
 214         info->length = (ACPI_NAME_SIZE * info->num_segments) +
 215             4 + info->num_carats;
 216
 217         info->next_external_char = next_external_char;
 218 }
 219
 220 /*******************************************************************************
 221  *
 222  * FUNCTION:    acpi_ns_build_internal_name
 223  *
 224  * PARAMETERS:  info            - Info struct fully initialized
 225  *
 226  * RETURN:      Status
 227  *
 228  * DESCRIPTION: Construct the internal (AML) namestring
 229  *              corresponding to the external (ASL) namestring.
 230  *
 231  ******************************************************************************/
 232
 233 acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info)
 234 {
 235         u32 num_segments = info->num_segments;
 236         char *internal_name = info->internal_name;
 237         const char *external_name = info->next_external_char;
 238         char *result = NULL;
 239         u32 i;
 240
 241         ACPI_FUNCTION_TRACE(ns_build_internal_name);
 242
 243         /* Setup the correct prefixes, counts, and pointers */
 244
 245         if (info->fully_qualified) {
 246                 internal_name[0] = AML_ROOT_PREFIX;
 247
 248                 if (num_segments <= 1) {
 249                         result = &internal_name[1];
 250                 } else if (num_segments == 2) {
 251                         internal_name[1] = AML_DUAL_NAME_PREFIX;
 252                         result = &internal_name[2];
 253                 } else {
 254                         internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
 255                         internal_name[2] = (char)num_segments;
 256                         result = &internal_name[3];
 257                 }
 258         } else {
 259                 /*
 260                  * Not fully qualified.
 261                  * Handle Carats first, then append the name segments
 262                  */
 263                 i = 0;
 264                 if (info->num_carats) {
 265                         for (i = 0; i < info->num_carats; i++) {
 266                                 internal_name[i] = AML_PARENT_PREFIX;
 267                         }
 268                 }
 269
 270                 if (num_segments <= 1) {
 271                         result = &internal_name[i];
 272                 } else if (num_segments == 2) {
 273                         internal_name[i] = AML_DUAL_NAME_PREFIX;
 274                         result = &internal_name[(acpi_size) i + 1];
 275                 } else {
 276                         internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
 277                         internal_name[(acpi_size) i + 1] = (char)num_segments;
 278                         result = &internal_name[(acpi_size) i + 2];
 279                 }
 280         }
 281
 282         /* Build the name (minus path separators) */
 283
 284         for (; num_segments; num_segments--) {
 285                 for (i = 0; i < ACPI_NAME_SIZE; i++) {
 286                         if (ACPI_IS_PATH_SEPARATOR(*external_name) ||
 287                             (*external_name == 0)) {
 288
 289                                 /* Pad the segment with underscore(s) if segment is short */
 290
 291                                 result[i] = '_';
 292                         } else {
 293                                 /* Convert the character to uppercase and save it */
 294
 295                                 result[i] =
 296                                     (char)ACPI_TOUPPER((int)*external_name);
 297                                 external_name++;
 298                         }
 299                 }
 300
 301                 /* Now we must have a path separator, or the pathname is bad */
 302
 303                 if (!ACPI_IS_PATH_SEPARATOR(*external_name) &&
 304                     (*external_name != 0)) {
 305                         return_ACPI_STATUS(AE_BAD_PATHNAME);
 306                 }
 307
 308                 /* Move on the next segment */
 309
 310                 external_name++;
 311                 result += ACPI_NAME_SIZE;
 312         }
 313
 314         /* Terminate the string */
 315
 316         *result = 0;
 317
 318         if (info->fully_qualified) {
 319                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 320                                   "Returning [%p] (abs) \"\\%s\"\n",
 321                                   internal_name, internal_name));
 322         } else {
 323                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
 324                                   internal_name, internal_name));
 325         }
 326
 327         return_ACPI_STATUS(AE_OK);
 328 }
 329
 330 /*******************************************************************************
 331  *
 332  * FUNCTION:    acpi_ns_internalize_name
 333  *
 334  * PARAMETERS:  *external_name          - External representation of name
 335  *              **Converted name        - Where to return the resulting
 336  *                                        internal represention of the name
 337  *
 338  * RETURN:      Status
 339  *
 340  * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
 341  *              to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
 342  *
 343  *******************************************************************************/
 344
 345 acpi_status
 346 acpi_ns_internalize_name(const char *external_name, char **converted_name)
 347 {
 348         char *internal_name;
 349         struct acpi_namestring_info info;
 350         acpi_status status;
 351
 352         ACPI_FUNCTION_TRACE(ns_internalize_name);
 353
 354         if ((!external_name) || (*external_name == 0) || (!converted_name)) {
 355                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 356         }
 357
 358         /* Get the length of the new internal name */
 359
 360         info.external_name = external_name;
 361         acpi_ns_get_internal_name_length(&info);
 362
 363         /* We need a segment to store the internal  name */
 364
 365         internal_name = ACPI_ALLOCATE_ZEROED(info.length);
 366         if (!internal_name) {
 367                 return_ACPI_STATUS(AE_NO_MEMORY);
 368         }
 369
 370         /* Build the name */
 371
 372         info.internal_name = internal_name;
 373         status = acpi_ns_build_internal_name(&info);
 374         if (ACPI_FAILURE(status)) {
 375                 ACPI_FREE(internal_name);
 376                 return_ACPI_STATUS(status);
 377         }
 378
 379         *converted_name = internal_name;
 380         return_ACPI_STATUS(AE_OK);
 381 }
 382
 383 /*******************************************************************************
 384  *
 385  * FUNCTION:    acpi_ns_externalize_name
 386  *
 387  * PARAMETERS:  internal_name_length - Lenth of the internal name below
 388  *              internal_name       - Internal representation of name
 389  *              converted_name_length - Where the length is returned
 390  *              converted_name      - Where the resulting external name
 391  *                                    is returned
 392  *
 393  * RETURN:      Status
 394  *
 395  * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
 396  *              to its external (printable) form (e.g. "\_PR_.CPU0")
 397  *
 398  ******************************************************************************/
 399
 400 acpi_status
 401 acpi_ns_externalize_name(u32 internal_name_length,
 402                          const char *internal_name,
 403                          u32 * converted_name_length, char **converted_name)
 404 {
 405         u32 names_index = 0;
 406         u32 num_segments = 0;
 407         u32 required_length;
 408         u32 prefix_length = 0;
 409         u32 i = 0;
 410         u32 j = 0;
 411
 412         ACPI_FUNCTION_TRACE(ns_externalize_name);
 413
 414         if (!internal_name_length || !internal_name || !converted_name) {
 415                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 416         }
 417
 418         /* Check for a prefix (one '\' | one or more '^') */
 419
 420         switch (internal_name[0]) {
 421         case AML_ROOT_PREFIX:
 422                 prefix_length = 1;
 423                 break;
 424
 425         case AML_PARENT_PREFIX:
 426                 for (i = 0; i < internal_name_length; i++) {
 427                         if (ACPI_IS_PARENT_PREFIX(internal_name[i])) {
 428                                 prefix_length = i + 1;
 429                         } else {
 430                                 break;
 431                         }
 432                 }
 433
 434                 if (i == internal_name_length) {
 435                         prefix_length = i;
 436                 }
 437
 438                 break;
 439
 440         default:
 441                 break;
 442         }
 443
 444         /*
 445          * Check for object names. Note that there could be 0-255 of these
 446          * 4-byte elements.
 447          */
 448         if (prefix_length < internal_name_length) {
 449                 switch (internal_name[prefix_length]) {
 450                 case AML_MULTI_NAME_PREFIX_OP:
 451
 452                         /* <count> 4-byte names */
 453
 454                         names_index = prefix_length + 2;
 455                         num_segments = (u8)
 456                             internal_name[(acpi_size) prefix_length + 1];
 457                         break;
 458
 459                 case AML_DUAL_NAME_PREFIX:
 460
 461                         /* Two 4-byte names */
 462
 463                         names_index = prefix_length + 1;
 464                         num_segments = 2;
 465                         break;
 466
 467                 case 0:
 468
 469                         /* null_name */
 470
 471                         names_index = 0;
 472                         num_segments = 0;
 473                         break;
 474
 475                 default:
 476
 477                         /* one 4-byte name */
 478
 479                         names_index = prefix_length;
 480                         num_segments = 1;
 481                         break;
 482                 }
 483         }
 484
 485         /*
 486          * Calculate the length of converted_name, which equals the length
 487          * of the prefix, length of all object names, length of any required
 488          * punctuation ('.') between object names, plus the NULL terminator.
 489          */
 490         required_length = prefix_length + (4 * num_segments) +
 491             ((num_segments > 0) ? (num_segments - 1) : 0) + 1;
 492
 493         /*
 494          * Check to see if we're still in bounds. If not, there's a problem
 495          * with internal_name (invalid format).
 496          */
 497         if (required_length > internal_name_length) {
 498                 ACPI_ERROR((AE_INFO, "Invalid internal name"));
 499                 return_ACPI_STATUS(AE_BAD_PATHNAME);
 500         }
 501
 502         /* Build the converted_name */
 503
 504         *converted_name = ACPI_ALLOCATE_ZEROED(required_length);
 505         if (!(*converted_name)) {
 506                 return_ACPI_STATUS(AE_NO_MEMORY);
 507         }
 508
 509         j = 0;
 510
 511         for (i = 0; i < prefix_length; i++) {
 512                 (*converted_name)[j++] = internal_name[i];
 513         }
 514
 515         if (num_segments > 0) {
 516                 for (i = 0; i < num_segments; i++) {
 517                         if (i > 0) {
 518                                 (*converted_name)[j++] = '.';
 519                         }
 520
 521                         /* Copy and validate the 4-char name segment */
 522
 523                         ACPI_MOVE_NAME(&(*converted_name)[j],
 524                                        &internal_name[names_index]);
 525                         acpi_ut_repair_name(&(*converted_name)[j]);
 526
 527                         j += ACPI_NAME_SIZE;
 528                         names_index += ACPI_NAME_SIZE;
 529                 }
 530         }
 531
 532         if (converted_name_length) {
 533                 *converted_name_length = (u32) required_length;
 534         }
 535
 536         return_ACPI_STATUS(AE_OK);
 537 }
 538
 539 /*******************************************************************************
 540  *
 541  * FUNCTION:    acpi_ns_validate_handle
 542  *
 543  * PARAMETERS:  handle          - Handle to be validated and typecast to a
 544  *                                namespace node.
 545  *
 546  * RETURN:      A pointer to a namespace node
 547  *
 548  * DESCRIPTION: Convert a namespace handle to a namespace node. Handles special
 549  *              cases for the root node.
 550  *
 551  * NOTE: Real integer handles would allow for more verification
 552  *       and keep all pointers within this subsystem - however this introduces
 553  *       more overhead and has not been necessary to this point. Drivers
 554  *       holding handles are typically notified before a node becomes invalid
 555  *       due to a table unload.
 556  *
 557  ******************************************************************************/
 558
 559 struct acpi_namespace_node *acpi_ns_validate_handle(acpi_handle handle)
 560 {
 561
 562         ACPI_FUNCTION_ENTRY();
 563
 564         /* Parameter validation */
 565
 566         if ((!handle) || (handle == ACPI_ROOT_OBJECT)) {
 567                 return (acpi_gbl_root_node);
 568         }
 569
 570         /* We can at least attempt to verify the handle */
 571
 572         if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) {
 573                 return (NULL);
 574         }
 575
 576         return (ACPI_CAST_PTR(struct acpi_namespace_node, handle));
 577 }
 578
 579 /*******************************************************************************
 580  *
 581  * FUNCTION:    acpi_ns_terminate
 582  *
 583  * PARAMETERS:  none
 584  *
 585  * RETURN:      none
 586  *
 587  * DESCRIPTION: free memory allocated for namespace and ACPI table storage.
 588  *
 589  ******************************************************************************/
 590
 591 void acpi_ns_terminate(void)
 592 {
 593         union acpi_operand_object *obj_desc;
 594
 595         ACPI_FUNCTION_TRACE(ns_terminate);
 596
 597         /*
 598          * 1) Free the entire namespace -- all nodes and objects
 599          *
 600          * Delete all object descriptors attached to namepsace nodes
 601          */
 602         acpi_ns_delete_namespace_subtree(acpi_gbl_root_node);
 603
 604         /* Detach any objects attached to the root */
 605
 606         obj_desc = acpi_ns_get_attached_object(acpi_gbl_root_node);
 607         if (obj_desc) {
 608                 acpi_ns_detach_object(acpi_gbl_root_node);
 609         }
 610
 611         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n"));
 612         return_VOID;
 613 }
 614
 615 /*******************************************************************************
 616  *
 617  * FUNCTION:    acpi_ns_opens_scope
 618  *
 619  * PARAMETERS:  type        - A valid namespace type
 620  *
 621  * RETURN:      NEWSCOPE if the passed type "opens a name scope" according
 622  *              to the ACPI specification, else 0
 623  *
 624  ******************************************************************************/
 625
 626 u32 acpi_ns_opens_scope(acpi_object_type type)
 627 {
 628         ACPI_FUNCTION_ENTRY();
 629
 630         if (type > ACPI_TYPE_LOCAL_MAX) {
 631
 632                 /* type code out of range  */
 633
 634                 ACPI_WARNING((AE_INFO, "Invalid Object Type 0x%X", type));
 635                 return (ACPI_NS_NORMAL);
 636         }
 637
 638         return (((u32)acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
 639 }
 640
 641 /*******************************************************************************
 642  *
 643  * FUNCTION:    acpi_ns_get_node
 644  *
 645  * PARAMETERS:  *pathname   - Name to be found, in external (ASL) format. The
 646  *                            \ (backslash) and ^ (carat) prefixes, and the
 647  *                            . (period) to separate segments are supported.
 648  *              prefix_node  - Root of subtree to be searched, or NS_ALL for the
 649  *                            root of the name space. If Name is fully
 650  *                            qualified (first s8 is '\'), the passed value
 651  *                            of Scope will not be accessed.
 652  *              flags       - Used to indicate whether to perform upsearch or
 653  *                            not.
 654  *              return_node - Where the Node is returned
 655  *
 656  * DESCRIPTION: Look up a name relative to a given scope and return the
 657  *              corresponding Node. NOTE: Scope can be null.
 658  *
 659  * MUTEX:       Locks namespace
 660  *
 661  ******************************************************************************/
 662
 663 acpi_status
 664 acpi_ns_get_node(struct acpi_namespace_node *prefix_node,
 665                  const char *pathname,
 666                  u32 flags, struct acpi_namespace_node **return_node)
 667 {
 668         union acpi_generic_state scope_info;
 669         acpi_status status;
 670         char *internal_path;
 671
 672         ACPI_FUNCTION_TRACE_PTR(ns_get_node, ACPI_CAST_PTR(char, pathname));
 673
 674         /* Simplest case is a null pathname */
 675
 676         if (!pathname) {
 677                 *return_node = prefix_node;
 678                 if (!prefix_node) {
 679                         *return_node = acpi_gbl_root_node;
 680                 }
 681                 return_ACPI_STATUS(AE_OK);
 682         }
 683
 684         /* Quick check for a reference to the root */
 685
 686         if (ACPI_IS_ROOT_PREFIX(pathname[0]) && (!pathname[1])) {
 687                 *return_node = acpi_gbl_root_node;
 688                 return_ACPI_STATUS(AE_OK);
 689         }
 690
 691         /* Convert path to internal representation */
 692
 693         status = acpi_ns_internalize_name(pathname, &internal_path);
 694         if (ACPI_FAILURE(status)) {
 695                 return_ACPI_STATUS(status);
 696         }
 697
 698         /* Must lock namespace during lookup */
 699
 700         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 701         if (ACPI_FAILURE(status)) {
 702                 goto cleanup;
 703         }
 704
 705         /* Setup lookup scope (search starting point) */
 706
 707         scope_info.scope.node = prefix_node;
 708
 709         /* Lookup the name in the namespace */
 710
 711         status = acpi_ns_lookup(&scope_info, internal_path, ACPI_TYPE_ANY,
 712                                 ACPI_IMODE_EXECUTE,
 713                                 (flags | ACPI_NS_DONT_OPEN_SCOPE), NULL,
 714                                 return_node);
 715         if (ACPI_FAILURE(status)) {
 716                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%s, %s\n",
 717                                   pathname, acpi_format_exception(status)));
 718         }
 719
 720         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 721
 722       cleanup:
 723         ACPI_FREE(internal_path);
 724         return_ACPI_STATUS(status);
 725 }