drivers/acpi/acpica/psobject.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psobject - Support for parse objects
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2017, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "amlcode.h"
  48 #include "acconvert.h"
  49
  50 #define _COMPONENT          ACPI_PARSER
  51 ACPI_MODULE_NAME("psobject")
  52
  53 /* Local prototypes */
  54 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state);
  55
  56 /*******************************************************************************
  57  *
  58  * FUNCTION:    acpi_ps_get_aml_opcode
  59  *
  60  * PARAMETERS:  walk_state          - Current state
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Extract the next AML opcode from the input stream.
  65  *
  66  ******************************************************************************/
  67
  68 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state)
  69 {
  70         u32 aml_offset;
  71
  72         ACPI_FUNCTION_TRACE_PTR(ps_get_aml_opcode, walk_state);
  73
  74         walk_state->aml = walk_state->parser_state.aml;
  75         walk_state->opcode = acpi_ps_peek_opcode(&(walk_state->parser_state));
  76
  77         /*
  78          * First cut to determine what we have found:
  79          * 1) A valid AML opcode
  80          * 2) A name string
  81          * 3) An unknown/invalid opcode
  82          */
  83         walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
  84
  85         switch (walk_state->op_info->class) {
  86         case AML_CLASS_ASCII:
  87         case AML_CLASS_PREFIX:
  88                 /*
  89                  * Starts with a valid prefix or ASCII char, this is a name
  90                  * string. Convert the bare name string to a namepath.
  91                  */
  92                 walk_state->opcode = AML_INT_NAMEPATH_OP;
  93                 walk_state->arg_types = ARGP_NAMESTRING;
  94                 break;
  95
  96         case AML_CLASS_UNKNOWN:
  97
  98                 /* The opcode is unrecognized. Complain and skip unknown opcodes */
  99
 100                 if (walk_state->pass_number == 2) {
 101                         aml_offset = (u32)ACPI_PTR_DIFF(walk_state->aml,
 102                                                         walk_state->
 103                                                         parser_state.aml_start);
 104
 105                         ACPI_ERROR((AE_INFO,
 106                                     "Unknown opcode 0x%.2X at table offset 0x%.4X, ignoring",
 107                                     walk_state->opcode,
 108                                     (u32)(aml_offset +
 109                                           sizeof(struct acpi_table_header))));
 110
 111                         ACPI_DUMP_BUFFER((walk_state->parser_state.aml - 16),
 112                                          48);
 113
 114 #ifdef ACPI_ASL_COMPILER
 115                         /*
 116                          * This is executed for the disassembler only. Output goes
 117                          * to the disassembled ASL output file.
 118                          */
 119                         acpi_os_printf
 120                             ("/*\nError: Unknown opcode 0x%.2X at table offset 0x%.4X, context:\n",
 121                              walk_state->opcode,
 122                              (u32)(aml_offset +
 123                                    sizeof(struct acpi_table_header)));
 124
 125                         /* Dump the context surrounding the invalid opcode */
 126
 127                         acpi_ut_dump_buffer(((u8 *)walk_state->parser_state.
 128                                              aml - 16), 48, DB_BYTE_DISPLAY,
 129                                             (aml_offset +
 130                                              sizeof(struct acpi_table_header) -
 131                                              16));
 132                         acpi_os_printf(" */\n");
 133 #endif
 134                 }
 135
 136                 /* Increment past one-byte or two-byte opcode */
 137
 138                 walk_state->parser_state.aml++;
 139                 if (walk_state->opcode > 0xFF) {        /* Can only happen if first byte is 0x5B */
 140                         walk_state->parser_state.aml++;
 141                 }
 142
 143                 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
 144
 145         default:
 146
 147                 /* Found opcode info, this is a normal opcode */
 148
 149                 walk_state->parser_state.aml +=
 150                     acpi_ps_get_opcode_size(walk_state->opcode);
 151                 walk_state->arg_types = walk_state->op_info->parse_args;
 152                 break;
 153         }
 154
 155         return_ACPI_STATUS(AE_OK);
 156 }
 157
 158 /*******************************************************************************
 159  *
 160  * FUNCTION:    acpi_ps_build_named_op
 161  *
 162  * PARAMETERS:  walk_state          - Current state
 163  *              aml_op_start        - Begin of named Op in AML
 164  *              unnamed_op          - Early Op (not a named Op)
 165  *              op                  - Returned Op
 166  *
 167  * RETURN:      Status
 168  *
 169  * DESCRIPTION: Parse a named Op
 170  *
 171  ******************************************************************************/
 172
 173 acpi_status
 174 acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
 175                        u8 *aml_op_start,
 176                        union acpi_parse_object *unnamed_op,
 177                        union acpi_parse_object **op)
 178 {
 179         acpi_status status = AE_OK;
 180         union acpi_parse_object *arg = NULL;
 181
 182         ACPI_FUNCTION_TRACE_PTR(ps_build_named_op, walk_state);
 183
 184         unnamed_op->common.value.arg = NULL;
 185         unnamed_op->common.arg_list_length = 0;
 186         unnamed_op->common.aml_opcode = walk_state->opcode;
 187
 188         /*
 189          * Get and append arguments until we find the node that contains
 190          * the name (the type ARGP_NAME).
 191          */
 192         while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) &&
 193                (GET_CURRENT_ARG_TYPE(walk_state->arg_types) != ARGP_NAME)) {
 194                 ASL_CV_CAPTURE_COMMENTS(walk_state);
 195                 status =
 196                     acpi_ps_get_next_arg(walk_state,
 197                                          &(walk_state->parser_state),
 198                                          GET_CURRENT_ARG_TYPE(walk_state->
 199                                                               arg_types), &arg);
 200                 if (ACPI_FAILURE(status)) {
 201                         return_ACPI_STATUS(status);
 202                 }
 203
 204                 acpi_ps_append_arg(unnamed_op, arg);
 205                 INCREMENT_ARG_LIST(walk_state->arg_types);
 206         }
 207
 208         /* are there any inline comments associated with the name_seg?? If so, save this. */
 209
 210         ASL_CV_CAPTURE_COMMENTS(walk_state);
 211
 212 #ifdef ACPI_ASL_COMPILER
 213         if (acpi_gbl_current_inline_comment != NULL) {
 214                 unnamed_op->common.name_comment =
 215                     acpi_gbl_current_inline_comment;
 216                 acpi_gbl_current_inline_comment = NULL;
 217         }
 218 #endif
 219
 220         /*
 221          * Make sure that we found a NAME and didn't run out of arguments
 222          */
 223         if (!GET_CURRENT_ARG_TYPE(walk_state->arg_types)) {
 224                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 225         }
 226
 227         /* We know that this arg is a name, move to next arg */
 228
 229         INCREMENT_ARG_LIST(walk_state->arg_types);
 230
 231         /*
 232          * Find the object. This will either insert the object into
 233          * the namespace or simply look it up
 234          */
 235         walk_state->op = NULL;
 236
 237         status = walk_state->descending_callback(walk_state, op);
 238         if (ACPI_FAILURE(status)) {
 239                 if (status != AE_CTRL_TERMINATE) {
 240                         ACPI_EXCEPTION((AE_INFO, status,
 241                                         "During name lookup/catalog"));
 242                 }
 243                 return_ACPI_STATUS(status);
 244         }
 245
 246         if (!*op) {
 247                 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
 248         }
 249
 250         status = acpi_ps_next_parse_state(walk_state, *op, status);
 251         if (ACPI_FAILURE(status)) {
 252                 if (status == AE_CTRL_PENDING) {
 253                         status = AE_CTRL_PARSE_PENDING;
 254                 }
 255                 return_ACPI_STATUS(status);
 256         }
 257
 258         acpi_ps_append_arg(*op, unnamed_op->common.value.arg);
 259
 260 #ifdef ACPI_ASL_COMPILER
 261
 262         /* save any comments that might be associated with unnamed_op. */
 263
 264         (*op)->common.inline_comment = unnamed_op->common.inline_comment;
 265         (*op)->common.end_node_comment = unnamed_op->common.end_node_comment;
 266         (*op)->common.close_brace_comment =
 267             unnamed_op->common.close_brace_comment;
 268         (*op)->common.name_comment = unnamed_op->common.name_comment;
 269         (*op)->common.comment_list = unnamed_op->common.comment_list;
 270         (*op)->common.end_blk_comment = unnamed_op->common.end_blk_comment;
 271         (*op)->common.cv_filename = unnamed_op->common.cv_filename;
 272         (*op)->common.cv_parent_filename =
 273             unnamed_op->common.cv_parent_filename;
 274         (*op)->named.aml = unnamed_op->common.aml;
 275
 276         unnamed_op->common.inline_comment = NULL;
 277         unnamed_op->common.end_node_comment = NULL;
 278         unnamed_op->common.close_brace_comment = NULL;
 279         unnamed_op->common.name_comment = NULL;
 280         unnamed_op->common.comment_list = NULL;
 281         unnamed_op->common.end_blk_comment = NULL;
 282 #endif
 283
 284         if ((*op)->common.aml_opcode == AML_REGION_OP ||
 285             (*op)->common.aml_opcode == AML_DATA_REGION_OP) {
 286                 /*
 287                  * Defer final parsing of an operation_region body, because we don't
 288                  * have enough info in the first pass to parse it correctly (i.e.,
 289                  * there may be method calls within the term_arg elements of the body.)
 290                  *
 291                  * However, we must continue parsing because the opregion is not a
 292                  * standalone package -- we don't know where the end is at this point.
 293                  *
 294                  * (Length is unknown until parse of the body complete)
 295                  */
 296                 (*op)->named.data = aml_op_start;
 297                 (*op)->named.length = 0;
 298         }
 299
 300         return_ACPI_STATUS(AE_OK);
 301 }
 302
 303 /*******************************************************************************
 304  *
 305  * FUNCTION:    acpi_ps_create_op
 306  *
 307  * PARAMETERS:  walk_state          - Current state
 308  *              aml_op_start        - Op start in AML
 309  *              new_op              - Returned Op
 310  *
 311  * RETURN:      Status
 312  *
 313  * DESCRIPTION: Get Op from AML
 314  *
 315  ******************************************************************************/
 316
 317 acpi_status
 318 acpi_ps_create_op(struct acpi_walk_state *walk_state,
 319                   u8 *aml_op_start, union acpi_parse_object **new_op)
 320 {
 321         acpi_status status = AE_OK;
 322         union acpi_parse_object *op;
 323         union acpi_parse_object *named_op = NULL;
 324         union acpi_parse_object *parent_scope;
 325         u8 argument_count;
 326         const struct acpi_opcode_info *op_info;
 327
 328         ACPI_FUNCTION_TRACE_PTR(ps_create_op, walk_state);
 329
 330         status = acpi_ps_get_aml_opcode(walk_state);
 331         if (status == AE_CTRL_PARSE_CONTINUE) {
 332                 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
 333         }
 334
 335         /* Create Op structure and append to parent's argument list */
 336
 337         walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
 338         op = acpi_ps_alloc_op(walk_state->opcode, aml_op_start);
 339         if (!op) {
 340                 return_ACPI_STATUS(AE_NO_MEMORY);
 341         }
 342
 343         if (walk_state->op_info->flags & AML_NAMED) {
 344                 status =
 345                     acpi_ps_build_named_op(walk_state, aml_op_start, op,
 346                                            &named_op);
 347                 acpi_ps_free_op(op);
 348                 if (ACPI_FAILURE(status)) {
 349                         return_ACPI_STATUS(status);
 350                 }
 351
 352                 *new_op = named_op;
 353                 return_ACPI_STATUS(AE_OK);
 354         }
 355
 356         /* Not a named opcode, just allocate Op and append to parent */
 357
 358         if (walk_state->op_info->flags & AML_CREATE) {
 359                 /*
 360                  * Backup to beginning of create_XXXfield declaration
 361                  * body_length is unknown until we parse the body
 362                  */
 363                 op->named.data = aml_op_start;
 364                 op->named.length = 0;
 365         }
 366
 367         if (walk_state->opcode == AML_BANK_FIELD_OP) {
 368                 /*
 369                  * Backup to beginning of bank_field declaration
 370                  * body_length is unknown until we parse the body
 371                  */
 372                 op->named.data = aml_op_start;
 373                 op->named.length = 0;
 374         }
 375
 376         parent_scope = acpi_ps_get_parent_scope(&(walk_state->parser_state));
 377         acpi_ps_append_arg(parent_scope, op);
 378
 379         if (parent_scope) {
 380                 op_info =
 381                     acpi_ps_get_opcode_info(parent_scope->common.aml_opcode);
 382                 if (op_info->flags & AML_HAS_TARGET) {
 383                         argument_count =
 384                             acpi_ps_get_argument_count(op_info->type);
 385                         if (parent_scope->common.arg_list_length >
 386                             argument_count) {
 387                                 op->common.flags |= ACPI_PARSEOP_TARGET;
 388                         }
 389                 }
 390
 391                 /*
 392                  * Special case for both Increment() and Decrement(), where
 393                  * the lone argument is both a source and a target.
 394                  */
 395                 else if ((parent_scope->common.aml_opcode == AML_INCREMENT_OP)
 396                          || (parent_scope->common.aml_opcode ==
 397                              AML_DECREMENT_OP)) {
 398                         op->common.flags |= ACPI_PARSEOP_TARGET;
 399                 }
 400         }
 401
 402         if (walk_state->descending_callback != NULL) {
 403                 /*
 404                  * Find the object. This will either insert the object into
 405                  * the namespace or simply look it up
 406                  */
 407                 walk_state->op = *new_op = op;
 408
 409                 status = walk_state->descending_callback(walk_state, &op);
 410                 status = acpi_ps_next_parse_state(walk_state, op, status);
 411                 if (status == AE_CTRL_PENDING) {
 412                         status = AE_CTRL_PARSE_PENDING;
 413                 }
 414         }
 415
 416         return_ACPI_STATUS(status);
 417 }
 418
 419 /*******************************************************************************
 420  *
 421  * FUNCTION:    acpi_ps_complete_op
 422  *
 423  * PARAMETERS:  walk_state          - Current state
 424  *              op                  - Returned Op
 425  *              status              - Parse status before complete Op
 426  *
 427  * RETURN:      Status
 428  *
 429  * DESCRIPTION: Complete Op
 430  *
 431  ******************************************************************************/
 432
 433 acpi_status
 434 acpi_ps_complete_op(struct acpi_walk_state *walk_state,
 435                     union acpi_parse_object **op, acpi_status status)
 436 {
 437         acpi_status status2;
 438
 439         ACPI_FUNCTION_TRACE_PTR(ps_complete_op, walk_state);
 440
 441         /*
 442          * Finished one argument of the containing scope
 443          */
 444         walk_state->parser_state.scope->parse_scope.arg_count--;
 445
 446         /* Close this Op (will result in parse subtree deletion) */
 447
 448         status2 = acpi_ps_complete_this_op(walk_state, *op);
 449         if (ACPI_FAILURE(status2)) {
 450                 return_ACPI_STATUS(status2);
 451         }
 452
 453         *op = NULL;
 454
 455         switch (status) {
 456         case AE_OK:
 457
 458                 break;
 459
 460         case AE_CTRL_TRANSFER:
 461
 462                 /* We are about to transfer to a called method */
 463
 464                 walk_state->prev_op = NULL;
 465                 walk_state->prev_arg_types = walk_state->arg_types;
 466                 return_ACPI_STATUS(status);
 467
 468         case AE_CTRL_END:
 469
 470                 acpi_ps_pop_scope(&(walk_state->parser_state), op,
 471                                   &walk_state->arg_types,
 472                                   &walk_state->arg_count);
 473
 474                 if (*op) {
 475                         walk_state->op = *op;
 476                         walk_state->op_info =
 477                             acpi_ps_get_opcode_info((*op)->common.aml_opcode);
 478                         walk_state->opcode = (*op)->common.aml_opcode;
 479
 480                         status = walk_state->ascending_callback(walk_state);
 481                         status =
 482                             acpi_ps_next_parse_state(walk_state, *op, status);
 483
 484                         status2 = acpi_ps_complete_this_op(walk_state, *op);
 485                         if (ACPI_FAILURE(status2)) {
 486                                 return_ACPI_STATUS(status2);
 487                         }
 488                 }
 489
 490                 status = AE_OK;
 491                 break;
 492
 493         case AE_CTRL_BREAK:
 494         case AE_CTRL_CONTINUE:
 495
 496                 /* Pop off scopes until we find the While */
 497
 498                 while (!(*op) || ((*op)->common.aml_opcode != AML_WHILE_OP)) {
 499                         acpi_ps_pop_scope(&(walk_state->parser_state), op,
 500                                           &walk_state->arg_types,
 501                                           &walk_state->arg_count);
 502                 }
 503
 504                 /* Close this iteration of the While loop */
 505
 506                 walk_state->op = *op;
 507                 walk_state->op_info =
 508                     acpi_ps_get_opcode_info((*op)->common.aml_opcode);
 509                 walk_state->opcode = (*op)->common.aml_opcode;
 510
 511                 status = walk_state->ascending_callback(walk_state);
 512                 status = acpi_ps_next_parse_state(walk_state, *op, status);
 513
 514                 status2 = acpi_ps_complete_this_op(walk_state, *op);
 515                 if (ACPI_FAILURE(status2)) {
 516                         return_ACPI_STATUS(status2);
 517                 }
 518
 519                 status = AE_OK;
 520                 break;
 521
 522         case AE_CTRL_TERMINATE:
 523
 524                 /* Clean up */
 525                 do {
 526                         if (*op) {
 527                                 status2 =
 528                                     acpi_ps_complete_this_op(walk_state, *op);
 529                                 if (ACPI_FAILURE(status2)) {
 530                                         return_ACPI_STATUS(status2);
 531                                 }
 532
 533                                 acpi_ut_delete_generic_state
 534                                     (acpi_ut_pop_generic_state
 535                                      (&walk_state->control_state));
 536                         }
 537
 538                         acpi_ps_pop_scope(&(walk_state->parser_state), op,
 539                                           &walk_state->arg_types,
 540                                           &walk_state->arg_count);
 541
 542                 } while (*op);
 543
 544                 return_ACPI_STATUS(AE_OK);
 545
 546         default:                /* All other non-AE_OK status */
 547
 548                 do {
 549                         if (*op) {
 550                                 status2 =
 551                                     acpi_ps_complete_this_op(walk_state, *op);
 552                                 if (ACPI_FAILURE(status2)) {
 553                                         return_ACPI_STATUS(status2);
 554                                 }
 555                         }
 556
 557                         acpi_ps_pop_scope(&(walk_state->parser_state), op,
 558                                           &walk_state->arg_types,
 559                                           &walk_state->arg_count);
 560
 561                 } while (*op);
 562
 563 #if 0
 564                 /*
 565                  * TBD: Cleanup parse ops on error
 566                  */
 567                 if (*op == NULL) {
 568                         acpi_ps_pop_scope(parser_state, op,
 569                                           &walk_state->arg_types,
 570                                           &walk_state->arg_count);
 571                 }
 572 #endif
 573                 walk_state->prev_op = NULL;
 574                 walk_state->prev_arg_types = walk_state->arg_types;
 575                 return_ACPI_STATUS(status);
 576         }
 577
 578         /* This scope complete? */
 579
 580         if (acpi_ps_has_completed_scope(&(walk_state->parser_state))) {
 581                 acpi_ps_pop_scope(&(walk_state->parser_state), op,
 582                                   &walk_state->arg_types,
 583                                   &walk_state->arg_count);
 584                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *op));
 585         } else {
 586                 *op = NULL;
 587         }
 588
 589         return_ACPI_STATUS(AE_OK);
 590 }
 591
 592 /*******************************************************************************
 593  *
 594  * FUNCTION:    acpi_ps_complete_final_op
 595  *
 596  * PARAMETERS:  walk_state          - Current state
 597  *              op                  - Current Op
 598  *              status              - Current parse status before complete last
 599  *                                    Op
 600  *
 601  * RETURN:      Status
 602  *
 603  * DESCRIPTION: Complete last Op.
 604  *
 605  ******************************************************************************/
 606
 607 acpi_status
 608 acpi_ps_complete_final_op(struct acpi_walk_state *walk_state,
 609                           union acpi_parse_object *op, acpi_status status)
 610 {
 611         acpi_status status2;
 612
 613         ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op, walk_state);
 614
 615         /*
 616          * Complete the last Op (if not completed), and clear the scope stack.
 617          * It is easily possible to end an AML "package" with an unbounded number
 618          * of open scopes (such as when several ASL blocks are closed with
 619          * sequential closing braces). We want to terminate each one cleanly.
 620          */
 621         ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n",
 622                           op));
 623         do {
 624                 if (op) {
 625                         if (walk_state->ascending_callback != NULL) {
 626                                 walk_state->op = op;
 627                                 walk_state->op_info =
 628                                     acpi_ps_get_opcode_info(op->common.
 629                                                             aml_opcode);
 630                                 walk_state->opcode = op->common.aml_opcode;
 631
 632                                 status =
 633                                     walk_state->ascending_callback(walk_state);
 634                                 status =
 635                                     acpi_ps_next_parse_state(walk_state, op,
 636                                                              status);
 637                                 if (status == AE_CTRL_PENDING) {
 638                                         status =
 639                                             acpi_ps_complete_op(walk_state, &op,
 640                                                                 AE_OK);
 641                                         if (ACPI_FAILURE(status)) {
 642                                                 return_ACPI_STATUS(status);
 643                                         }
 644                                 }
 645
 646                                 if (status == AE_CTRL_TERMINATE) {
 647                                         status = AE_OK;
 648
 649                                         /* Clean up */
 650                                         do {
 651                                                 if (op) {
 652                                                         status2 =
 653                                                             acpi_ps_complete_this_op
 654                                                             (walk_state, op);
 655                                                         if (ACPI_FAILURE
 656                                                             (status2)) {
 657                                                                 return_ACPI_STATUS
 658                                                                     (status2);
 659                                                         }
 660                                                 }
 661
 662                                                 acpi_ps_pop_scope(&
 663                                                                   (walk_state->
 664                                                                    parser_state),
 665                                                                   &op,
 666                                                                   &walk_state->
 667                                                                   arg_types,
 668                                                                   &walk_state->
 669                                                                   arg_count);
 670
 671                                         } while (op);
 672
 673                                         return_ACPI_STATUS(status);
 674                                 }
 675
 676                                 else if (ACPI_FAILURE(status)) {
 677
 678                                         /* First error is most important */
 679
 680                                         (void)
 681                                             acpi_ps_complete_this_op(walk_state,
 682                                                                      op);
 683                                         return_ACPI_STATUS(status);
 684                                 }
 685                         }
 686
 687                         status2 = acpi_ps_complete_this_op(walk_state, op);
 688                         if (ACPI_FAILURE(status2)) {
 689                                 return_ACPI_STATUS(status2);
 690                         }
 691                 }
 692
 693                 acpi_ps_pop_scope(&(walk_state->parser_state), &op,
 694                                   &walk_state->arg_types,
 695                                   &walk_state->arg_count);
 696
 697         } while (op);
 698
 699         return_ACPI_STATUS(status);
 700 }