drivers/acpi/acpica/tbinstal.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbinstal - ACPI table installation and removal
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2011, 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 "acnamesp.h"
  47 #include "actables.h"
  48
  49 #define _COMPONENT          ACPI_TABLES
  50 ACPI_MODULE_NAME("tbinstal")
  51
  52 /******************************************************************************
  53  *
  54  * FUNCTION:    acpi_tb_verify_table
  55  *
  56  * PARAMETERS:  table_desc          - table
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: this function is called to verify and map table
  61  *
  62  *****************************************************************************/
  63 acpi_status acpi_tb_verify_table(struct acpi_table_desc *table_desc)
  64 {
  65         acpi_status status = AE_OK;
  66
  67         ACPI_FUNCTION_TRACE(tb_verify_table);
  68
  69         /* Map the table if necessary */
  70
  71         if (!table_desc->pointer) {
  72                 if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
  73                     ACPI_TABLE_ORIGIN_MAPPED) {
  74                         table_desc->pointer =
  75                             acpi_os_map_memory(table_desc->address,
  76                                                table_desc->length);
  77                 }
  78                 if (!table_desc->pointer) {
  79                         return_ACPI_STATUS(AE_NO_MEMORY);
  80                 }
  81         }
  82
  83         /* FACS is the odd table, has no standard ACPI header and no checksum */
  84
  85         if (!ACPI_COMPARE_NAME(&table_desc->signature, ACPI_SIG_FACS)) {
  86
  87                 /* Always calculate checksum, ignore bad checksum if requested */
  88
  89                 status =
  90                     acpi_tb_verify_checksum(table_desc->pointer,
  91                                             table_desc->length);
  92         }
  93
  94         return_ACPI_STATUS(status);
  95 }
  96
  97 /*******************************************************************************
  98  *
  99  * FUNCTION:    acpi_tb_add_table
 100  *
 101  * PARAMETERS:  table_desc          - Table descriptor
 102  *              table_index         - Where the table index is returned
 103  *
 104  * RETURN:      Status
 105  *
 106  * DESCRIPTION: This function is called to add an ACPI table. It is used to
 107  *              dynamically load tables via the Load and load_table AML
 108  *              operators.
 109  *
 110  ******************************************************************************/
 111
 112 acpi_status
 113 acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
 114 {
 115         u32 i;
 116         acpi_status status = AE_OK;
 117         struct acpi_table_header *override_table = NULL;
 118
 119         ACPI_FUNCTION_TRACE(tb_add_table);
 120
 121         if (!table_desc->pointer) {
 122                 status = acpi_tb_verify_table(table_desc);
 123                 if (ACPI_FAILURE(status) || !table_desc->pointer) {
 124                         return_ACPI_STATUS(status);
 125                 }
 126         }
 127
 128         /*
 129          * Validate the incoming table signature.
 130          *
 131          * 1) Originally, we checked the table signature for "SSDT" or "PSDT".
 132          * 2) We added support for OEMx tables, signature "OEM".
 133          * 3) Valid tables were encountered with a null signature, so we just
 134          *    gave up on validating the signature, (05/2008).
 135          * 4) We encountered non-AML tables such as the MADT, which caused
 136          *    interpreter errors and kernel faults. So now, we once again allow
 137          *    only "SSDT", "OEMx", and now, also a null signature. (05/2011).
 138          */
 139         if ((table_desc->pointer->signature[0] != 0x00) &&
 140             (!ACPI_COMPARE_NAME(table_desc->pointer->signature, ACPI_SIG_SSDT))
 141             && (ACPI_STRNCMP(table_desc->pointer->signature, "OEM", 3))) {
 142                 ACPI_ERROR((AE_INFO,
 143                             "Table has invalid signature [%4.4s] (0x%8.8X), must be SSDT or OEMx",
 144                             acpi_ut_valid_acpi_name(*(u32 *)table_desc->
 145                                                     pointer->
 146                                                     signature) ? table_desc->
 147                             pointer->signature : "????",
 148                             *(u32 *)table_desc->pointer->signature));
 149
 150                 return_ACPI_STATUS(AE_BAD_SIGNATURE);
 151         }
 152
 153         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 154
 155         /* Check if table is already registered */
 156
 157         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 158                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
 159                         status =
 160                             acpi_tb_verify_table(&acpi_gbl_root_table_list.
 161                                                  tables[i]);
 162                         if (ACPI_FAILURE(status)
 163                             || !acpi_gbl_root_table_list.tables[i].pointer) {
 164                                 continue;
 165                         }
 166                 }
 167
 168                 /*
 169                  * Check for a table match on the entire table length,
 170                  * not just the header.
 171                  */
 172                 if (table_desc->length !=
 173                     acpi_gbl_root_table_list.tables[i].length) {
 174                         continue;
 175                 }
 176
 177                 if (ACPI_MEMCMP(table_desc->pointer,
 178                                 acpi_gbl_root_table_list.tables[i].pointer,
 179                                 acpi_gbl_root_table_list.tables[i].length)) {
 180                         continue;
 181                 }
 182
 183                 /*
 184                  * Note: the current mechanism does not unregister a table if it is
 185                  * dynamically unloaded. The related namespace entries are deleted,
 186                  * but the table remains in the root table list.
 187                  *
 188                  * The assumption here is that the number of different tables that
 189                  * will be loaded is actually small, and there is minimal overhead
 190                  * in just keeping the table in case it is needed again.
 191                  *
 192                  * If this assumption changes in the future (perhaps on large
 193                  * machines with many table load/unload operations), tables will
 194                  * need to be unregistered when they are unloaded, and slots in the
 195                  * root table list should be reused when empty.
 196                  */
 197
 198                 /*
 199                  * Table is already registered.
 200                  * We can delete the table that was passed as a parameter.
 201                  */
 202                 acpi_tb_delete_table(table_desc);
 203                 *table_index = i;
 204
 205                 if (acpi_gbl_root_table_list.tables[i].
 206                     flags & ACPI_TABLE_IS_LOADED) {
 207
 208                         /* Table is still loaded, this is an error */
 209
 210                         status = AE_ALREADY_EXISTS;
 211                         goto release;
 212                 } else {
 213                         /* Table was unloaded, allow it to be reloaded */
 214
 215                         table_desc->pointer =
 216                             acpi_gbl_root_table_list.tables[i].pointer;
 217                         table_desc->address =
 218                             acpi_gbl_root_table_list.tables[i].address;
 219                         status = AE_OK;
 220                         goto print_header;
 221                 }
 222         }
 223
 224         /*
 225          * ACPI Table Override:
 226          * Allow the host to override dynamically loaded tables.
 227          */
 228         status = acpi_os_table_override(table_desc->pointer, &override_table);
 229         if (ACPI_SUCCESS(status) && override_table) {
 230                 ACPI_INFO((AE_INFO,
 231                            "%4.4s @ 0x%p Table override, replaced with:",
 232                            table_desc->pointer->signature,
 233                            ACPI_CAST_PTR(void, table_desc->address)));
 234
 235                 /* We can delete the table that was passed as a parameter */
 236
 237                 acpi_tb_delete_table(table_desc);
 238
 239                 /* Setup descriptor for the new table */
 240
 241                 table_desc->address = ACPI_PTR_TO_PHYSADDR(override_table);
 242                 table_desc->pointer = override_table;
 243                 table_desc->length = override_table->length;
 244                 table_desc->flags = ACPI_TABLE_ORIGIN_OVERRIDE;
 245         }
 246
 247         /* Add the table to the global root table list */
 248
 249         status = acpi_tb_store_table(table_desc->address, table_desc->pointer,
 250                                      table_desc->length, table_desc->flags,
 251                                      table_index);
 252         if (ACPI_FAILURE(status)) {
 253                 goto release;
 254         }
 255
 256       print_header:
 257         acpi_tb_print_table_header(table_desc->address, table_desc->pointer);
 258
 259       release:
 260         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 261         return_ACPI_STATUS(status);
 262 }
 263
 264 /*******************************************************************************
 265  *
 266  * FUNCTION:    acpi_tb_resize_root_table_list
 267  *
 268  * PARAMETERS:  None
 269  *
 270  * RETURN:      Status
 271  *
 272  * DESCRIPTION: Expand the size of global table array
 273  *
 274  ******************************************************************************/
 275
 276 acpi_status acpi_tb_resize_root_table_list(void)
 277 {
 278         struct acpi_table_desc *tables;
 279
 280         ACPI_FUNCTION_TRACE(tb_resize_root_table_list);
 281
 282         /* allow_resize flag is a parameter to acpi_initialize_tables */
 283
 284         if (!(acpi_gbl_root_table_list.flags & ACPI_ROOT_ALLOW_RESIZE)) {
 285                 ACPI_ERROR((AE_INFO,
 286                             "Resize of Root Table Array is not allowed"));
 287                 return_ACPI_STATUS(AE_SUPPORT);
 288         }
 289
 290         /* Increase the Table Array size */
 291
 292         tables = ACPI_ALLOCATE_ZEROED(((acpi_size) acpi_gbl_root_table_list.
 293                                        max_table_count +
 294                                        ACPI_ROOT_TABLE_SIZE_INCREMENT) *
 295                                       sizeof(struct acpi_table_desc));
 296         if (!tables) {
 297                 ACPI_ERROR((AE_INFO,
 298                             "Could not allocate new root table array"));
 299                 return_ACPI_STATUS(AE_NO_MEMORY);
 300         }
 301
 302         /* Copy and free the previous table array */
 303
 304         if (acpi_gbl_root_table_list.tables) {
 305                 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables,
 306                             (acpi_size) acpi_gbl_root_table_list.
 307                             max_table_count * sizeof(struct acpi_table_desc));
 308
 309                 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 310                         ACPI_FREE(acpi_gbl_root_table_list.tables);
 311                 }
 312         }
 313
 314         acpi_gbl_root_table_list.tables = tables;
 315         acpi_gbl_root_table_list.max_table_count +=
 316             ACPI_ROOT_TABLE_SIZE_INCREMENT;
 317         acpi_gbl_root_table_list.flags |= (u8)ACPI_ROOT_ORIGIN_ALLOCATED;
 318
 319         return_ACPI_STATUS(AE_OK);
 320 }
 321
 322 /*******************************************************************************
 323  *
 324  * FUNCTION:    acpi_tb_store_table
 325  *
 326  * PARAMETERS:  Address             - Table address
 327  *              Table               - Table header
 328  *              Length              - Table length
 329  *              Flags               - flags
 330  *
 331  * RETURN:      Status and table index.
 332  *
 333  * DESCRIPTION: Add an ACPI table to the global table list
 334  *
 335  ******************************************************************************/
 336
 337 acpi_status
 338 acpi_tb_store_table(acpi_physical_address address,
 339                     struct acpi_table_header *table,
 340                     u32 length, u8 flags, u32 *table_index)
 341 {
 342         acpi_status status;
 343         struct acpi_table_desc *new_table;
 344
 345         /* Ensure that there is room for the table in the Root Table List */
 346
 347         if (acpi_gbl_root_table_list.current_table_count >=
 348             acpi_gbl_root_table_list.max_table_count) {
 349                 status = acpi_tb_resize_root_table_list();
 350                 if (ACPI_FAILURE(status)) {
 351                         return (status);
 352                 }
 353         }
 354
 355         new_table =
 356             &acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.
 357                                              current_table_count];
 358
 359         /* Initialize added table */
 360
 361         new_table->address = address;
 362         new_table->pointer = table;
 363         new_table->length = length;
 364         new_table->owner_id = 0;
 365         new_table->flags = flags;
 366
 367         ACPI_MOVE_32_TO_32(&new_table->signature, table->signature);
 368
 369         *table_index = acpi_gbl_root_table_list.current_table_count;
 370         acpi_gbl_root_table_list.current_table_count++;
 371         return (AE_OK);
 372 }
 373
 374 /*******************************************************************************
 375  *
 376  * FUNCTION:    acpi_tb_delete_table
 377  *
 378  * PARAMETERS:  table_index         - Table index
 379  *
 380  * RETURN:      None
 381  *
 382  * DESCRIPTION: Delete one internal ACPI table
 383  *
 384  ******************************************************************************/
 385
 386 void acpi_tb_delete_table(struct acpi_table_desc *table_desc)
 387 {
 388         /* Table must be mapped or allocated */
 389         if (!table_desc->pointer) {
 390                 return;
 391         }
 392         switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
 393         case ACPI_TABLE_ORIGIN_MAPPED:
 394                 acpi_os_unmap_memory(table_desc->pointer, table_desc->length);
 395                 break;
 396         case ACPI_TABLE_ORIGIN_ALLOCATED:
 397                 ACPI_FREE(table_desc->pointer);
 398                 break;
 399         default:;
 400         }
 401
 402         table_desc->pointer = NULL;
 403 }
 404
 405 /*******************************************************************************
 406  *
 407  * FUNCTION:    acpi_tb_terminate
 408  *
 409  * PARAMETERS:  None
 410  *
 411  * RETURN:      None
 412  *
 413  * DESCRIPTION: Delete all internal ACPI tables
 414  *
 415  ******************************************************************************/
 416
 417 void acpi_tb_terminate(void)
 418 {
 419         u32 i;
 420
 421         ACPI_FUNCTION_TRACE(tb_terminate);
 422
 423         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 424
 425         /* Delete the individual tables */
 426
 427         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 428                 acpi_tb_delete_table(&acpi_gbl_root_table_list.tables[i]);
 429         }
 430
 431         /*
 432          * Delete the root table array if allocated locally. Array cannot be
 433          * mapped, so we don't need to check for that flag.
 434          */
 435         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 436                 ACPI_FREE(acpi_gbl_root_table_list.tables);
 437         }
 438
 439         acpi_gbl_root_table_list.tables = NULL;
 440         acpi_gbl_root_table_list.flags = 0;
 441         acpi_gbl_root_table_list.current_table_count = 0;
 442
 443         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));
 444         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 445 }
 446
 447 /*******************************************************************************
 448  *
 449  * FUNCTION:    acpi_tb_delete_namespace_by_owner
 450  *
 451  * PARAMETERS:  table_index         - Table index
 452  *
 453  * RETURN:      Status
 454  *
 455  * DESCRIPTION: Delete all namespace objects created when this table was loaded.
 456  *
 457  ******************************************************************************/
 458
 459 acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index)
 460 {
 461         acpi_owner_id owner_id;
 462         acpi_status status;
 463
 464         ACPI_FUNCTION_TRACE(tb_delete_namespace_by_owner);
 465
 466         status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 467         if (ACPI_FAILURE(status)) {
 468                 return_ACPI_STATUS(status);
 469         }
 470
 471         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 472
 473                 /* The table index does not exist */
 474
 475                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 476                 return_ACPI_STATUS(AE_NOT_EXIST);
 477         }
 478
 479         /* Get the owner ID for this table, used to delete namespace nodes */
 480
 481         owner_id = acpi_gbl_root_table_list.tables[table_index].owner_id;
 482         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 483
 484         /*
 485          * Need to acquire the namespace writer lock to prevent interference
 486          * with any concurrent namespace walks. The interpreter must be
 487          * released during the deletion since the acquisition of the deletion
 488          * lock may block, and also since the execution of a namespace walk
 489          * must be allowed to use the interpreter.
 490          */
 491         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 492         status = acpi_ut_acquire_write_lock(&acpi_gbl_namespace_rw_lock);
 493
 494         acpi_ns_delete_namespace_by_owner(owner_id);
 495         if (ACPI_FAILURE(status)) {
 496                 return_ACPI_STATUS(status);
 497         }
 498
 499         acpi_ut_release_write_lock(&acpi_gbl_namespace_rw_lock);
 500
 501         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 502         return_ACPI_STATUS(status);
 503 }
 504
 505 /*******************************************************************************
 506  *
 507  * FUNCTION:    acpi_tb_allocate_owner_id
 508  *
 509  * PARAMETERS:  table_index         - Table index
 510  *
 511  * RETURN:      Status
 512  *
 513  * DESCRIPTION: Allocates owner_id in table_desc
 514  *
 515  ******************************************************************************/
 516
 517 acpi_status acpi_tb_allocate_owner_id(u32 table_index)
 518 {
 519         acpi_status status = AE_BAD_PARAMETER;
 520
 521         ACPI_FUNCTION_TRACE(tb_allocate_owner_id);
 522
 523         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 524         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 525                 status = acpi_ut_allocate_owner_id
 526                     (&(acpi_gbl_root_table_list.tables[table_index].owner_id));
 527         }
 528
 529         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 530         return_ACPI_STATUS(status);
 531 }
 532
 533 /*******************************************************************************
 534  *
 535  * FUNCTION:    acpi_tb_release_owner_id
 536  *
 537  * PARAMETERS:  table_index         - Table index
 538  *
 539  * RETURN:      Status
 540  *
 541  * DESCRIPTION: Releases owner_id in table_desc
 542  *
 543  ******************************************************************************/
 544
 545 acpi_status acpi_tb_release_owner_id(u32 table_index)
 546 {
 547         acpi_status status = AE_BAD_PARAMETER;
 548
 549         ACPI_FUNCTION_TRACE(tb_release_owner_id);
 550
 551         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 552         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 553                 acpi_ut_release_owner_id(&
 554                                          (acpi_gbl_root_table_list.
 555                                           tables[table_index].owner_id));
 556                 status = AE_OK;
 557         }
 558
 559         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 560         return_ACPI_STATUS(status);
 561 }
 562
 563 /*******************************************************************************
 564  *
 565  * FUNCTION:    acpi_tb_get_owner_id
 566  *
 567  * PARAMETERS:  table_index         - Table index
 568  *              owner_id            - Where the table owner_id is returned
 569  *
 570  * RETURN:      Status
 571  *
 572  * DESCRIPTION: returns owner_id for the ACPI table
 573  *
 574  ******************************************************************************/
 575
 576 acpi_status acpi_tb_get_owner_id(u32 table_index, acpi_owner_id *owner_id)
 577 {
 578         acpi_status status = AE_BAD_PARAMETER;
 579
 580         ACPI_FUNCTION_TRACE(tb_get_owner_id);
 581
 582         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 583         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 584                 *owner_id =
 585                     acpi_gbl_root_table_list.tables[table_index].owner_id;
 586                 status = AE_OK;
 587         }
 588
 589         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 590         return_ACPI_STATUS(status);
 591 }
 592
 593 /*******************************************************************************
 594  *
 595  * FUNCTION:    acpi_tb_is_table_loaded
 596  *
 597  * PARAMETERS:  table_index         - Table index
 598  *
 599  * RETURN:      Table Loaded Flag
 600  *
 601  ******************************************************************************/
 602
 603 u8 acpi_tb_is_table_loaded(u32 table_index)
 604 {
 605         u8 is_loaded = FALSE;
 606
 607         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 608         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 609                 is_loaded = (u8)
 610                     (acpi_gbl_root_table_list.tables[table_index].flags &
 611                      ACPI_TABLE_IS_LOADED);
 612         }
 613
 614         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 615         return (is_loaded);
 616 }
 617
 618 /*******************************************************************************
 619  *
 620  * FUNCTION:    acpi_tb_set_table_loaded_flag
 621  *
 622  * PARAMETERS:  table_index         - Table index
 623  *              is_loaded           - TRUE if table is loaded, FALSE otherwise
 624  *
 625  * RETURN:      None
 626  *
 627  * DESCRIPTION: Sets the table loaded flag to either TRUE or FALSE.
 628  *
 629  ******************************************************************************/
 630
 631 void acpi_tb_set_table_loaded_flag(u32 table_index, u8 is_loaded)
 632 {
 633
 634         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 635         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 636                 if (is_loaded) {
 637                         acpi_gbl_root_table_list.tables[table_index].flags |=
 638                             ACPI_TABLE_IS_LOADED;
 639                 } else {
 640                         acpi_gbl_root_table_list.tables[table_index].flags &=
 641                             ~ACPI_TABLE_IS_LOADED;
 642                 }
 643         }
 644
 645         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 646 }