drivers/acpi/acpica/psparse.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psparse - Parser top level AML parse routines
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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 /*
  45  * Parse the AML and build an operation tree as most interpreters,
  46  * like Perl, do. Parsing is done by hand rather than with a YACC
  47  * generated parser to tightly constrain stack and dynamic memory
  48  * usage. At the same time, parsing is kept flexible and the code
  49  * fairly compact by parsing based on a list of AML opcode
  50  * templates in aml_op_info[]
  51  */
  52
  53 #include <acpi/acpi.h>
  54 #include "accommon.h"
  55 #include "acparser.h"
  56 #include "acdispat.h"
  57 #include "amlcode.h"
  58 #include "acinterp.h"
  59
  60 #define _COMPONENT          ACPI_PARSER
  61 ACPI_MODULE_NAME("psparse")
  62
  63 /*******************************************************************************
  64  *
  65  * FUNCTION:    acpi_ps_get_opcode_size
  66  *
  67  * PARAMETERS:  opcode          - An AML opcode
  68  *
  69  * RETURN:      Size of the opcode, in bytes (1 or 2)
  70  *
  71  * DESCRIPTION: Get the size of the current opcode.
  72  *
  73  ******************************************************************************/
  74 u32 acpi_ps_get_opcode_size(u32 opcode)
  75 {
  76
  77         /* Extended (2-byte) opcode if > 255 */
  78
  79         if (opcode > 0x00FF) {
  80                 return (2);
  81         }
  82
  83         /* Otherwise, just a single byte opcode */
  84
  85         return (1);
  86 }
  87
  88 /*******************************************************************************
  89  *
  90  * FUNCTION:    acpi_ps_peek_opcode
  91  *
  92  * PARAMETERS:  parser_state        - A parser state object
  93  *
  94  * RETURN:      Next AML opcode
  95  *
  96  * DESCRIPTION: Get next AML opcode (without incrementing AML pointer)
  97  *
  98  ******************************************************************************/
  99
 100 u16 acpi_ps_peek_opcode(struct acpi_parse_state * parser_state)
 101 {
 102         u8 *aml;
 103         u16 opcode;
 104
 105         aml = parser_state->aml;
 106         opcode = (u16) ACPI_GET8(aml);
 107
 108         if (opcode == AML_EXTENDED_OP_PREFIX) {
 109
 110                 /* Extended opcode, get the second opcode byte */
 111
 112                 aml++;
 113                 opcode = (u16) ((opcode << 8) | ACPI_GET8(aml));
 114         }
 115
 116         return (opcode);
 117 }
 118
 119 /*******************************************************************************
 120  *
 121  * FUNCTION:    acpi_ps_complete_this_op
 122  *
 123  * PARAMETERS:  walk_state      - Current State
 124  *              op              - Op to complete
 125  *
 126  * RETURN:      Status
 127  *
 128  * DESCRIPTION: Perform any cleanup at the completion of an Op.
 129  *
 130  ******************************************************************************/
 131
 132 acpi_status
 133 acpi_ps_complete_this_op(struct acpi_walk_state * walk_state,
 134                          union acpi_parse_object * op)
 135 {
 136         union acpi_parse_object *prev;
 137         union acpi_parse_object *next;
 138         const struct acpi_opcode_info *parent_info;
 139         union acpi_parse_object *replacement_op = NULL;
 140         acpi_status status = AE_OK;
 141
 142         ACPI_FUNCTION_TRACE_PTR(ps_complete_this_op, op);
 143
 144         /* Check for null Op, can happen if AML code is corrupt */
 145
 146         if (!op) {
 147                 return_ACPI_STATUS(AE_OK);      /* OK for now */
 148         }
 149
 150         /* Delete this op and the subtree below it if asked to */
 151
 152         if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) !=
 153              ACPI_PARSE_DELETE_TREE)
 154             || (walk_state->op_info->class == AML_CLASS_ARGUMENT)) {
 155                 return_ACPI_STATUS(AE_OK);
 156         }
 157
 158         /* Make sure that we only delete this subtree */
 159
 160         if (op->common.parent) {
 161                 prev = op->common.parent->common.value.arg;
 162                 if (!prev) {
 163
 164                         /* Nothing more to do */
 165
 166                         goto cleanup;
 167                 }
 168
 169                 /*
 170                  * Check if we need to replace the operator and its subtree
 171                  * with a return value op (placeholder op)
 172                  */
 173                 parent_info =
 174                     acpi_ps_get_opcode_info(op->common.parent->common.
 175                                             aml_opcode);
 176
 177                 switch (parent_info->class) {
 178                 case AML_CLASS_CONTROL:
 179
 180                         break;
 181
 182                 case AML_CLASS_CREATE:
 183                         /*
 184                          * These opcodes contain term_arg operands. The current
 185                          * op must be replaced by a placeholder return op
 186                          */
 187                         replacement_op =
 188                             acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP,
 189                                              op->common.aml);
 190                         if (!replacement_op) {
 191                                 status = AE_NO_MEMORY;
 192                         }
 193                         break;
 194
 195                 case AML_CLASS_NAMED_OBJECT:
 196                         /*
 197                          * These opcodes contain term_arg operands. The current
 198                          * op must be replaced by a placeholder return op
 199                          */
 200                         if ((op->common.parent->common.aml_opcode ==
 201                              AML_REGION_OP)
 202                             || (op->common.parent->common.aml_opcode ==
 203                                 AML_DATA_REGION_OP)
 204                             || (op->common.parent->common.aml_opcode ==
 205                                 AML_BUFFER_OP)
 206                             || (op->common.parent->common.aml_opcode ==
 207                                 AML_PACKAGE_OP)
 208                             || (op->common.parent->common.aml_opcode ==
 209                                 AML_BANK_FIELD_OP)
 210                             || (op->common.parent->common.aml_opcode ==
 211                                 AML_VAR_PACKAGE_OP)) {
 212                                 replacement_op =
 213                                     acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP,
 214                                                      op->common.aml);
 215                                 if (!replacement_op) {
 216                                         status = AE_NO_MEMORY;
 217                                 }
 218                         } else
 219                             if ((op->common.parent->common.aml_opcode ==
 220                                  AML_NAME_OP)
 221                                 && (walk_state->pass_number <=
 222                                     ACPI_IMODE_LOAD_PASS2)) {
 223                                 if ((op->common.aml_opcode == AML_BUFFER_OP)
 224                                     || (op->common.aml_opcode == AML_PACKAGE_OP)
 225                                     || (op->common.aml_opcode ==
 226                                         AML_VAR_PACKAGE_OP)) {
 227                                         replacement_op =
 228                                             acpi_ps_alloc_op(op->common.
 229                                                              aml_opcode,
 230                                                              op->common.aml);
 231                                         if (!replacement_op) {
 232                                                 status = AE_NO_MEMORY;
 233                                         } else {
 234                                                 replacement_op->named.data =
 235                                                     op->named.data;
 236                                                 replacement_op->named.length =
 237                                                     op->named.length;
 238                                         }
 239                                 }
 240                         }
 241                         break;
 242
 243                 default:
 244
 245                         replacement_op =
 246                             acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP,
 247                                              op->common.aml);
 248                         if (!replacement_op) {
 249                                 status = AE_NO_MEMORY;
 250                         }
 251                 }
 252
 253                 /* We must unlink this op from the parent tree */
 254
 255                 if (prev == op) {
 256
 257                         /* This op is the first in the list */
 258
 259                         if (replacement_op) {
 260                                 replacement_op->common.parent =
 261                                     op->common.parent;
 262                                 replacement_op->common.value.arg = NULL;
 263                                 replacement_op->common.node = op->common.node;
 264                                 op->common.parent->common.value.arg =
 265                                     replacement_op;
 266                                 replacement_op->common.next = op->common.next;
 267                         } else {
 268                                 op->common.parent->common.value.arg =
 269                                     op->common.next;
 270                         }
 271                 }
 272
 273                 /* Search the parent list */
 274
 275                 else
 276                         while (prev) {
 277
 278                                 /* Traverse all siblings in the parent's argument list */
 279
 280                                 next = prev->common.next;
 281                                 if (next == op) {
 282                                         if (replacement_op) {
 283                                                 replacement_op->common.parent =
 284                                                     op->common.parent;
 285                                                 replacement_op->common.value.
 286                                                     arg = NULL;
 287                                                 replacement_op->common.node =
 288                                                     op->common.node;
 289                                                 prev->common.next =
 290                                                     replacement_op;
 291                                                 replacement_op->common.next =
 292                                                     op->common.next;
 293                                                 next = NULL;
 294                                         } else {
 295                                                 prev->common.next =
 296                                                     op->common.next;
 297                                                 next = NULL;
 298                                         }
 299                                 }
 300                                 prev = next;
 301                         }
 302         }
 303
 304 cleanup:
 305
 306         /* Now we can actually delete the subtree rooted at Op */
 307
 308         acpi_ps_delete_parse_tree(op);
 309         return_ACPI_STATUS(status);
 310 }
 311
 312 /*******************************************************************************
 313  *
 314  * FUNCTION:    acpi_ps_next_parse_state
 315  *
 316  * PARAMETERS:  walk_state          - Current state
 317  *              op                  - Current parse op
 318  *              callback_status     - Status from previous operation
 319  *
 320  * RETURN:      Status
 321  *
 322  * DESCRIPTION: Update the parser state based upon the return exception from
 323  *              the parser callback.
 324  *
 325  ******************************************************************************/
 326
 327 acpi_status
 328 acpi_ps_next_parse_state(struct acpi_walk_state *walk_state,
 329                          union acpi_parse_object *op,
 330                          acpi_status callback_status)
 331 {
 332         struct acpi_parse_state *parser_state = &walk_state->parser_state;
 333         acpi_status status = AE_CTRL_PENDING;
 334
 335         ACPI_FUNCTION_TRACE_PTR(ps_next_parse_state, op);
 336
 337         switch (callback_status) {
 338         case AE_CTRL_TERMINATE:
 339                 /*
 340                  * A control method was terminated via a RETURN statement.
 341                  * The walk of this method is complete.
 342                  */
 343                 parser_state->aml = parser_state->aml_end;
 344                 status = AE_CTRL_TERMINATE;
 345                 break;
 346
 347         case AE_CTRL_BREAK:
 348
 349                 parser_state->aml = walk_state->aml_last_while;
 350                 walk_state->control_state->common.value = FALSE;
 351                 status = AE_CTRL_BREAK;
 352                 break;
 353
 354         case AE_CTRL_CONTINUE:
 355
 356                 parser_state->aml = walk_state->aml_last_while;
 357                 status = AE_CTRL_CONTINUE;
 358                 break;
 359
 360         case AE_CTRL_PENDING:
 361
 362                 parser_state->aml = walk_state->aml_last_while;
 363                 break;
 364
 365 #if 0
 366         case AE_CTRL_SKIP:
 367
 368                 parser_state->aml = parser_state->scope->parse_scope.pkg_end;
 369                 status = AE_OK;
 370                 break;
 371 #endif
 372
 373         case AE_CTRL_TRUE:
 374                 /*
 375                  * Predicate of an IF was true, and we are at the matching ELSE.
 376                  * Just close out this package
 377                  */
 378                 parser_state->aml = acpi_ps_get_next_package_end(parser_state);
 379                 status = AE_CTRL_PENDING;
 380                 break;
 381
 382         case AE_CTRL_FALSE:
 383                 /*
 384                  * Either an IF/WHILE Predicate was false or we encountered a BREAK
 385                  * opcode. In both cases, we do not execute the rest of the
 386                  * package;  We simply close out the parent (finishing the walk of
 387                  * this branch of the tree) and continue execution at the parent
 388                  * level.
 389                  */
 390                 parser_state->aml = parser_state->scope->parse_scope.pkg_end;
 391
 392                 /* In the case of a BREAK, just force a predicate (if any) to FALSE */
 393
 394                 walk_state->control_state->common.value = FALSE;
 395                 status = AE_CTRL_END;
 396                 break;
 397
 398         case AE_CTRL_TRANSFER:
 399
 400                 /* A method call (invocation) -- transfer control */
 401
 402                 status = AE_CTRL_TRANSFER;
 403                 walk_state->prev_op = op;
 404                 walk_state->method_call_op = op;
 405                 walk_state->method_call_node =
 406                     (op->common.value.arg)->common.node;
 407
 408                 /* Will return value (if any) be used by the caller? */
 409
 410                 walk_state->return_used =
 411                     acpi_ds_is_result_used(op, walk_state);
 412                 break;
 413
 414         default:
 415
 416                 status = callback_status;
 417                 if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) {
 418                         status = AE_OK;
 419                 }
 420                 break;
 421         }
 422
 423         return_ACPI_STATUS(status);
 424 }
 425
 426 /*******************************************************************************
 427  *
 428  * FUNCTION:    acpi_ps_parse_aml
 429  *
 430  * PARAMETERS:  walk_state      - Current state
 431  *
 432  *
 433  * RETURN:      Status
 434  *
 435  * DESCRIPTION: Parse raw AML and return a tree of ops
 436  *
 437  ******************************************************************************/
 438
 439 acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state)
 440 {
 441         acpi_status status;
 442         struct acpi_thread_state *thread;
 443         struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list;
 444         struct acpi_walk_state *previous_walk_state;
 445
 446         ACPI_FUNCTION_TRACE(ps_parse_aml);
 447
 448         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 449                           "Entered with WalkState=%p Aml=%p size=%X\n",
 450                           walk_state, walk_state->parser_state.aml,
 451                           walk_state->parser_state.aml_size));
 452
 453         if (!walk_state->parser_state.aml) {
 454                 return_ACPI_STATUS(AE_NULL_OBJECT);
 455         }
 456
 457         /* Create and initialize a new thread state */
 458
 459         thread = acpi_ut_create_thread_state();
 460         if (!thread) {
 461                 if (walk_state->method_desc) {
 462
 463                         /* Executing a control method - additional cleanup */
 464
 465                         acpi_ds_terminate_control_method(walk_state->
 466                                                          method_desc,
 467                                                          walk_state);
 468                 }
 469
 470                 acpi_ds_delete_walk_state(walk_state);
 471                 return_ACPI_STATUS(AE_NO_MEMORY);
 472         }
 473
 474         walk_state->thread = thread;
 475
 476         /*
 477          * If executing a method, the starting sync_level is this method's
 478          * sync_level
 479          */
 480         if (walk_state->method_desc) {
 481                 walk_state->thread->current_sync_level =
 482                     walk_state->method_desc->method.sync_level;
 483         }
 484
 485         acpi_ds_push_walk_state(walk_state, thread);
 486
 487         /*
 488          * This global allows the AML debugger to get a handle to the currently
 489          * executing control method.
 490          */
 491         acpi_gbl_current_walk_list = thread;
 492
 493         /*
 494          * Execute the walk loop as long as there is a valid Walk State. This
 495          * handles nested control method invocations without recursion.
 496          */
 497         ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "State=%p\n", walk_state));
 498
 499         status = AE_OK;
 500         while (walk_state) {
 501                 if (ACPI_SUCCESS(status)) {
 502                         /*
 503                          * The parse_loop executes AML until the method terminates
 504                          * or calls another method.
 505                          */
 506                         status = acpi_ps_parse_loop(walk_state);
 507                 }
 508
 509                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 510                                   "Completed one call to walk loop, %s State=%p\n",
 511                                   acpi_format_exception(status), walk_state));
 512
 513                 if (status == AE_CTRL_TRANSFER) {
 514                         /*
 515                          * A method call was detected.
 516                          * Transfer control to the called control method
 517                          */
 518                         status =
 519                             acpi_ds_call_control_method(thread, walk_state,
 520                                                         NULL);
 521                         if (ACPI_FAILURE(status)) {
 522                                 status =
 523                                     acpi_ds_method_error(status, walk_state);
 524                         }
 525
 526                         /*
 527                          * If the transfer to the new method method call worked, a new walk
 528                          * state was created -- get it
 529                          */
 530                         walk_state = acpi_ds_get_current_walk_state(thread);
 531                         continue;
 532                 } else if (status == AE_CTRL_TERMINATE) {
 533                         status = AE_OK;
 534                 } else if ((status != AE_OK) && (walk_state->method_desc)) {
 535
 536                         /* Either the method parse or actual execution failed */
 537
 538                         ACPI_ERROR_METHOD("Method parse/execution failed",
 539                                           walk_state->method_node, NULL,
 540                                           status);
 541
 542                         /* Check for possible multi-thread reentrancy problem */
 543
 544                         if ((status == AE_ALREADY_EXISTS) &&
 545                             (!(walk_state->method_desc->method.
 546                                info_flags & ACPI_METHOD_SERIALIZED))) {
 547                                 /*
 548                                  * Method is not serialized and tried to create an object
 549                                  * twice. The probable cause is that the method cannot
 550                                  * handle reentrancy. Mark as "pending serialized" now, and
 551                                  * then mark "serialized" when the last thread exits.
 552                                  */
 553                                 walk_state->method_desc->method.info_flags |=
 554                                     ACPI_METHOD_SERIALIZED_PENDING;
 555                         }
 556                 }
 557
 558                 /* We are done with this walk, move on to the parent if any */
 559
 560                 walk_state = acpi_ds_pop_walk_state(thread);
 561
 562                 /* Reset the current scope to the beginning of scope stack */
 563
 564                 acpi_ds_scope_stack_clear(walk_state);
 565
 566                 /*
 567                  * If we just returned from the execution of a control method or if we
 568                  * encountered an error during the method parse phase, there's lots of
 569                  * cleanup to do
 570                  */
 571                 if (((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
 572                      ACPI_PARSE_EXECUTE) || (ACPI_FAILURE(status))) {
 573                         acpi_ds_terminate_control_method(walk_state->
 574                                                          method_desc,
 575                                                          walk_state);
 576                 }
 577
 578                 /* Delete this walk state and all linked control states */
 579
 580                 acpi_ps_cleanup_scope(&walk_state->parser_state);
 581                 previous_walk_state = walk_state;
 582
 583                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 584                                   "ReturnValue=%p, ImplicitValue=%p State=%p\n",
 585                                   walk_state->return_desc,
 586                                   walk_state->implicit_return_obj, walk_state));
 587
 588                 /* Check if we have restarted a preempted walk */
 589
 590                 walk_state = acpi_ds_get_current_walk_state(thread);
 591                 if (walk_state) {
 592                         if (ACPI_SUCCESS(status)) {
 593                                 /*
 594                                  * There is another walk state, restart it.
 595                                  * If the method return value is not used by the parent,
 596                                  * The object is deleted
 597                                  */
 598                                 if (!previous_walk_state->return_desc) {
 599                                         /*
 600                                          * In slack mode execution, if there is no return value
 601                                          * we should implicitly return zero (0) as a default value.
 602                                          */
 603                                         if (acpi_gbl_enable_interpreter_slack &&
 604                                             !previous_walk_state->
 605                                             implicit_return_obj) {
 606                                                 previous_walk_state->
 607                                                     implicit_return_obj =
 608                                                     acpi_ut_create_integer_object
 609                                                     ((u64) 0);
 610                                                 if (!previous_walk_state->
 611                                                     implicit_return_obj) {
 612                                                         return_ACPI_STATUS
 613                                                             (AE_NO_MEMORY);
 614                                                 }
 615                                         }
 616
 617                                         /* Restart the calling control method */
 618
 619                                         status =
 620                                             acpi_ds_restart_control_method
 621                                             (walk_state,
 622                                              previous_walk_state->
 623                                              implicit_return_obj);
 624                                 } else {
 625                                         /*
 626                                          * We have a valid return value, delete any implicit
 627                                          * return value.
 628                                          */
 629                                         acpi_ds_clear_implicit_return
 630                                             (previous_walk_state);
 631
 632                                         status =
 633                                             acpi_ds_restart_control_method
 634                                             (walk_state,
 635                                              previous_walk_state->return_desc);
 636                                 }
 637                                 if (ACPI_SUCCESS(status)) {
 638                                         walk_state->walk_type |=
 639                                             ACPI_WALK_METHOD_RESTART;
 640                                 }
 641                         } else {
 642                                 /* On error, delete any return object or implicit return */
 643
 644                                 acpi_ut_remove_reference(previous_walk_state->
 645                                                          return_desc);
 646                                 acpi_ds_clear_implicit_return
 647                                     (previous_walk_state);
 648                         }
 649                 }
 650
 651                 /*
 652                  * Just completed a 1st-level method, save the final internal return
 653                  * value (if any)
 654                  */
 655                 else if (previous_walk_state->caller_return_desc) {
 656                         if (previous_walk_state->implicit_return_obj) {
 657                                 *(previous_walk_state->caller_return_desc) =
 658                                     previous_walk_state->implicit_return_obj;
 659                         } else {
 660                                 /* NULL if no return value */
 661
 662                                 *(previous_walk_state->caller_return_desc) =
 663                                     previous_walk_state->return_desc;
 664                         }
 665                 } else {
 666                         if (previous_walk_state->return_desc) {
 667
 668                                 /* Caller doesn't want it, must delete it */
 669
 670                                 acpi_ut_remove_reference(previous_walk_state->
 671                                                          return_desc);
 672                         }
 673                         if (previous_walk_state->implicit_return_obj) {
 674
 675                                 /* Caller doesn't want it, must delete it */
 676
 677                                 acpi_ut_remove_reference(previous_walk_state->
 678                                                          implicit_return_obj);
 679                         }
 680                 }
 681
 682                 acpi_ds_delete_walk_state(previous_walk_state);
 683         }
 684
 685         /* Normal exit */
 686
 687         acpi_ex_release_all_mutexes(thread);
 688         acpi_ut_delete_generic_state(ACPI_CAST_PTR
 689                                      (union acpi_generic_state, thread));
 690         acpi_gbl_current_walk_list = prev_walk_list;
 691         return_ACPI_STATUS(status);
 692 }