drivers/acpi/utilities/utdelete.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utdelete - object deletion and reference count utilities
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   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 #include <acpi/acpi.h>
  46 #include <acpi/acinterp.h>
  47 #include <acpi/acnamesp.h>
  48 #include <acpi/acevents.h>
  49 #include <acpi/amlcode.h>
  50
  51 #define _COMPONENT          ACPI_UTILITIES
  52          ACPI_MODULE_NAME    ("utdelete")
  53
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ut_delete_internal_obj
  58  *
  59  * PARAMETERS:  *Object        - Pointer to the list to be deleted
  60  *
  61  * RETURN:      None
  62  *
  63  * DESCRIPTION: Low level object deletion, after reference counts have been
  64  *              updated (All reference counts, including sub-objects!)
  65  *
  66  ******************************************************************************/
  67
  68 void
  69 acpi_ut_delete_internal_obj (
  70         union acpi_operand_object       *object)
  71 {
  72         void                            *obj_pointer = NULL;
  73         union acpi_operand_object       *handler_desc;
  74         union acpi_operand_object       *second_desc;
  75         union acpi_operand_object       *next_desc;
  76
  77
  78         ACPI_FUNCTION_TRACE_PTR ("ut_delete_internal_obj", object);
  79
  80
  81         if (!object) {
  82                 return_VOID;
  83         }
  84
  85         /*
  86          * Must delete or free any pointers within the object that are not
  87          * actual ACPI objects (for example, a raw buffer pointer).
  88          */
  89         switch (ACPI_GET_OBJECT_TYPE (object)) {
  90         case ACPI_TYPE_STRING:
  91
  92                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "**** String %p, ptr %p\n",
  93                         object, object->string.pointer));
  94
  95                 /* Free the actual string buffer */
  96
  97                 if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
  98                         /* But only if it is NOT a pointer into an ACPI table */
  99
 100                         obj_pointer = object->string.pointer;
 101                 }
 102                 break;
 103
 104
 105         case ACPI_TYPE_BUFFER:
 106
 107                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "**** Buffer %p, ptr %p\n",
 108                         object, object->buffer.pointer));
 109
 110                 /* Free the actual buffer */
 111
 112                 if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
 113                         /* But only if it is NOT a pointer into an ACPI table */
 114
 115                         obj_pointer = object->buffer.pointer;
 116                 }
 117                 break;
 118
 119
 120         case ACPI_TYPE_PACKAGE:
 121
 122                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, " **** Package of count %X\n",
 123                         object->package.count));
 124
 125                 /*
 126                  * Elements of the package are not handled here, they are deleted
 127                  * separately
 128                  */
 129
 130                 /* Free the (variable length) element pointer array */
 131
 132                 obj_pointer = object->package.elements;
 133                 break;
 134
 135
 136         case ACPI_TYPE_DEVICE:
 137
 138                 if (object->device.gpe_block) {
 139                         (void) acpi_ev_delete_gpe_block (object->device.gpe_block);
 140                 }
 141
 142                 /* Walk the handler list for this device */
 143
 144                 handler_desc = object->device.handler;
 145                 while (handler_desc) {
 146                         next_desc = handler_desc->address_space.next;
 147                         acpi_ut_remove_reference (handler_desc);
 148                         handler_desc = next_desc;
 149                 }
 150                 break;
 151
 152
 153         case ACPI_TYPE_MUTEX:
 154
 155                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "***** Mutex %p, Semaphore %p\n",
 156                         object, object->mutex.semaphore));
 157
 158                 acpi_ex_unlink_mutex (object);
 159                 (void) acpi_os_delete_semaphore (object->mutex.semaphore);
 160                 break;
 161
 162
 163         case ACPI_TYPE_EVENT:
 164
 165                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "***** Event %p, Semaphore %p\n",
 166                         object, object->event.semaphore));
 167
 168                 (void) acpi_os_delete_semaphore (object->event.semaphore);
 169                 object->event.semaphore = NULL;
 170                 break;
 171
 172
 173         case ACPI_TYPE_METHOD:
 174
 175                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "***** Method %p\n", object));
 176
 177                 /* Delete the method semaphore if it exists */
 178
 179                 if (object->method.semaphore) {
 180                         (void) acpi_os_delete_semaphore (object->method.semaphore);
 181                         object->method.semaphore = NULL;
 182                 }
 183                 break;
 184
 185
 186         case ACPI_TYPE_REGION:
 187
 188                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "***** Region %p\n", object));
 189
 190                 second_desc = acpi_ns_get_secondary_object (object);
 191                 if (second_desc) {
 192                         /*
 193                          * Free the region_context if and only if the handler is one of the
 194                          * default handlers -- and therefore, we created the context object
 195                          * locally, it was not created by an external caller.
 196                          */
 197                         handler_desc = object->region.handler;
 198                         if (handler_desc) {
 199                                 if (handler_desc->address_space.hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
 200                                         obj_pointer = second_desc->extra.region_context;
 201                                 }
 202
 203                                 acpi_ut_remove_reference (handler_desc);
 204                         }
 205
 206                         /* Now we can free the Extra object */
 207
 208                         acpi_ut_delete_object_desc (second_desc);
 209                 }
 210                 break;
 211
 212
 213         case ACPI_TYPE_BUFFER_FIELD:
 214
 215                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "***** Buffer Field %p\n", object));
 216
 217                 second_desc = acpi_ns_get_secondary_object (object);
 218                 if (second_desc) {
 219                         acpi_ut_delete_object_desc (second_desc);
 220                 }
 221                 break;
 222
 223
 224         default:
 225                 break;
 226         }
 227
 228         /* Free any allocated memory (pointer within the object) found above */
 229
 230         if (obj_pointer) {
 231                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Deleting Object Subptr %p\n",
 232                                 obj_pointer));
 233                 ACPI_MEM_FREE (obj_pointer);
 234         }
 235
 236         /* Now the object can be safely deleted */
 237
 238         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
 239                         object, acpi_ut_get_object_type_name (object)));
 240
 241         acpi_ut_delete_object_desc (object);
 242         return_VOID;
 243 }
 244
 245
 246 /*******************************************************************************
 247  *
 248  * FUNCTION:    acpi_ut_delete_internal_object_list
 249  *
 250  * PARAMETERS:  *obj_list       - Pointer to the list to be deleted
 251  *
 252  * RETURN:      None
 253  *
 254  * DESCRIPTION: This function deletes an internal object list, including both
 255  *              simple objects and package objects
 256  *
 257  ******************************************************************************/
 258
 259 void
 260 acpi_ut_delete_internal_object_list (
 261         union acpi_operand_object       **obj_list)
 262 {
 263         union acpi_operand_object       **internal_obj;
 264
 265
 266         ACPI_FUNCTION_TRACE ("ut_delete_internal_object_list");
 267
 268
 269         /* Walk the null-terminated internal list */
 270
 271         for (internal_obj = obj_list; *internal_obj; internal_obj++) {
 272                 acpi_ut_remove_reference (*internal_obj);
 273         }
 274
 275         /* Free the combined parameter pointer list and object array */
 276
 277         ACPI_MEM_FREE (obj_list);
 278         return_VOID;
 279 }
 280
 281
 282 /*******************************************************************************
 283  *
 284  * FUNCTION:    acpi_ut_update_ref_count
 285  *
 286  * PARAMETERS:  *Object         - Object whose ref count is to be updated
 287  *              Action          - What to do
 288  *
 289  * RETURN:      New ref count
 290  *
 291  * DESCRIPTION: Modify the ref count and return it.
 292  *
 293  ******************************************************************************/
 294
 295 static void
 296 acpi_ut_update_ref_count (
 297         union acpi_operand_object       *object,
 298         u32                             action)
 299 {
 300         u16                             count;
 301         u16                             new_count;
 302
 303
 304         ACPI_FUNCTION_NAME ("ut_update_ref_count");
 305
 306
 307         if (!object) {
 308                 return;
 309         }
 310
 311         count = object->common.reference_count;
 312         new_count = count;
 313
 314         /*
 315          * Perform the reference count action (increment, decrement, or force delete)
 316          */
 317         switch (action) {
 318
 319         case REF_INCREMENT:
 320
 321                 new_count++;
 322                 object->common.reference_count = new_count;
 323
 324                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Obj %p Refs=%X, [Incremented]\n",
 325                         object, new_count));
 326                 break;
 327
 328
 329         case REF_DECREMENT:
 330
 331                 if (count < 1) {
 332                         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Obj %p Refs=%X, can't decrement! (Set to 0)\n",
 333                                 object, new_count));
 334
 335                         new_count = 0;
 336                 }
 337                 else {
 338                         new_count--;
 339
 340                         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Obj %p Refs=%X, [Decremented]\n",
 341                                 object, new_count));
 342                 }
 343
 344                 if (ACPI_GET_OBJECT_TYPE (object) == ACPI_TYPE_METHOD) {
 345                         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Method Obj %p Refs=%X, [Decremented]\n",
 346                                 object, new_count));
 347                 }
 348
 349                 object->common.reference_count = new_count;
 350                 if (new_count == 0) {
 351                         acpi_ut_delete_internal_obj (object);
 352                 }
 353
 354                 break;
 355
 356
 357         case REF_FORCE_DELETE:
 358
 359                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Obj %p Refs=%X, Force delete! (Set to 0)\n",
 360                         object, count));
 361
 362                 new_count = 0;
 363                 object->common.reference_count = new_count;
 364                 acpi_ut_delete_internal_obj (object);
 365                 break;
 366
 367
 368         default:
 369
 370                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown action (%X)\n", action));
 371                 break;
 372         }
 373
 374         /*
 375          * Sanity check the reference count, for debug purposes only.
 376          * (A deleted object will have a huge reference count)
 377          */
 378         if (count > ACPI_MAX_REFERENCE_COUNT) {
 379
 380                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN,
 381                         "**** Warning **** Large Reference Count (%X) in object %p\n\n",
 382                         count, object));
 383         }
 384
 385         return;
 386 }
 387
 388
 389 /*******************************************************************************
 390  *
 391  * FUNCTION:    acpi_ut_update_object_reference
 392  *
 393  * PARAMETERS:  *Object             - Increment ref count for this object
 394  *                                    and all sub-objects
 395  *              Action              - Either REF_INCREMENT or REF_DECREMENT or
 396  *                                    REF_FORCE_DELETE
 397  *
 398  * RETURN:      Status
 399  *
 400  * DESCRIPTION: Increment the object reference count
 401  *
 402  * Object references are incremented when:
 403  * 1) An object is attached to a Node (namespace object)
 404  * 2) An object is copied (all subobjects must be incremented)
 405  *
 406  * Object references are decremented when:
 407  * 1) An object is detached from an Node
 408  *
 409  ******************************************************************************/
 410
 411 acpi_status
 412 acpi_ut_update_object_reference (
 413         union acpi_operand_object       *object,
 414         u16                             action)
 415 {
 416         acpi_status                     status;
 417         u32                             i;
 418         union acpi_generic_state         *state_list = NULL;
 419         union acpi_generic_state         *state;
 420         union acpi_operand_object        *tmp;
 421
 422         ACPI_FUNCTION_TRACE_PTR ("ut_update_object_reference", object);
 423
 424
 425         /* Ignore a null object ptr */
 426
 427         if (!object) {
 428                 return_ACPI_STATUS (AE_OK);
 429         }
 430
 431         /* Make sure that this isn't a namespace handle */
 432
 433         if (ACPI_GET_DESCRIPTOR_TYPE (object) == ACPI_DESC_TYPE_NAMED) {
 434                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Object %p is NS handle\n", object));
 435                 return_ACPI_STATUS (AE_OK);
 436         }
 437
 438         state = acpi_ut_create_update_state (object, action);
 439
 440         while (state) {
 441                 object = state->update.object;
 442                 action = state->update.value;
 443                 acpi_ut_delete_generic_state (state);
 444
 445                 /*
 446                  * All sub-objects must have their reference count incremented also.
 447                  * Different object types have different subobjects.
 448                  */
 449                 switch (ACPI_GET_OBJECT_TYPE (object)) {
 450                 case ACPI_TYPE_DEVICE:
 451
 452                         tmp = object->device.system_notify;
 453                         if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
 454                                 object->device.system_notify = NULL;
 455                         acpi_ut_update_ref_count (tmp, action);
 456
 457                         tmp = object->device.device_notify;
 458                         if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
 459                                 object->device.device_notify = NULL;
 460                         acpi_ut_update_ref_count (tmp, action);
 461
 462                         break;
 463
 464
 465                 case ACPI_TYPE_PACKAGE:
 466
 467                         /*
 468                          * We must update all the sub-objects of the package
 469                          * (Each of whom may have their own sub-objects, etc.
 470                          */
 471                         for (i = 0; i < object->package.count; i++) {
 472                                 /*
 473                                  * Push each element onto the stack for later processing.
 474                                  * Note: There can be null elements within the package,
 475                                  * these are simply ignored
 476                                  */
 477                                 status = acpi_ut_create_update_state_and_push (
 478                                                  object->package.elements[i], action, &state_list);
 479                                 if (ACPI_FAILURE (status)) {
 480                                         goto error_exit;
 481                                 }
 482
 483                                 tmp = object->package.elements[i];
 484                                 if (tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
 485                                         object->package.elements[i] = NULL;
 486                         }
 487                         break;
 488
 489
 490                 case ACPI_TYPE_BUFFER_FIELD:
 491
 492                         status = acpi_ut_create_update_state_and_push (
 493                                          object->buffer_field.buffer_obj, action, &state_list);
 494                         if (ACPI_FAILURE (status)) {
 495                                 goto error_exit;
 496                         }
 497
 498                         tmp = object->buffer_field.buffer_obj;
 499                         if ( tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
 500                                 object->buffer_field.buffer_obj = NULL;
 501                         break;
 502
 503
 504                 case ACPI_TYPE_LOCAL_REGION_FIELD:
 505
 506                         status = acpi_ut_create_update_state_and_push (
 507                                          object->field.region_obj, action, &state_list);
 508                         if (ACPI_FAILURE (status)) {
 509                                 goto error_exit;
 510                         }
 511
 512                         tmp = object->field.region_obj;
 513                         if ( tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
 514                                 object->field.region_obj = NULL;
 515                    break;
 516
 517
 518                 case ACPI_TYPE_LOCAL_BANK_FIELD:
 519
 520                         status = acpi_ut_create_update_state_and_push (
 521                                          object->bank_field.bank_obj, action, &state_list);
 522                         if (ACPI_FAILURE (status)) {
 523                                 goto error_exit;
 524                         }
 525
 526                         tmp = object->bank_field.bank_obj;
 527                         if ( tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
 528                                 object->bank_field.bank_obj = NULL;
 529
 530                         status = acpi_ut_create_update_state_and_push (
 531                                          object->bank_field.region_obj, action, &state_list);
 532                         if (ACPI_FAILURE (status)) {
 533                                 goto error_exit;
 534                         }
 535
 536                         tmp = object->bank_field.region_obj;
 537                         if ( tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
 538                                 object->bank_field.region_obj = NULL;
 539                         break;
 540
 541
 542                 case ACPI_TYPE_LOCAL_INDEX_FIELD:
 543
 544                         status = acpi_ut_create_update_state_and_push (
 545                                          object->index_field.index_obj, action, &state_list);
 546                         if (ACPI_FAILURE (status)) {
 547                                 goto error_exit;
 548                         }
 549
 550                         tmp = object->index_field.index_obj;
 551                         if ( tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
 552                                 object->index_field.index_obj = NULL;
 553
 554                         status = acpi_ut_create_update_state_and_push (
 555                                          object->index_field.data_obj, action, &state_list);
 556                         if (ACPI_FAILURE (status)) {
 557                                 goto error_exit;
 558                         }
 559
 560                         tmp = object->index_field.data_obj;
 561                         if ( tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
 562                                 object->index_field.data_obj = NULL;
 563                         break;
 564
 565
 566                 case ACPI_TYPE_LOCAL_REFERENCE:
 567
 568                         /*
 569                          * The target of an Index (a package, string, or buffer) must track
 570                          * changes to the ref count of the index.
 571                          */
 572                         if (object->reference.opcode == AML_INDEX_OP) {
 573                                 status = acpi_ut_create_update_state_and_push (
 574                                                  object->reference.object, action, &state_list);
 575                                 if (ACPI_FAILURE (status)) {
 576                                         goto error_exit;
 577                                 }
 578                         }
 579                         break;
 580
 581
 582                 case ACPI_TYPE_REGION:
 583                 default:
 584
 585                         /* No subobjects */
 586                         break;
 587                 }
 588
 589                 /*
 590                  * Now we can update the count in the main object.  This can only
 591                  * happen after we update the sub-objects in case this causes the
 592                  * main object to be deleted.
 593                  */
 594                 acpi_ut_update_ref_count (object, action);
 595
 596                 /* Move on to the next object to be updated */
 597
 598                 state = acpi_ut_pop_generic_state (&state_list);
 599         }
 600
 601         return_ACPI_STATUS (AE_OK);
 602
 603
 604 error_exit:
 605
 606         ACPI_REPORT_ERROR (("Could not update object reference count, %s\n",
 607                 acpi_format_exception (status)));
 608
 609         return_ACPI_STATUS (status);
 610 }
 611
 612
 613 /*******************************************************************************
 614  *
 615  * FUNCTION:    acpi_ut_add_reference
 616  *
 617  * PARAMETERS:  *Object        - Object whose reference count is to be
 618  *                                  incremented
 619  *
 620  * RETURN:      None
 621  *
 622  * DESCRIPTION: Add one reference to an ACPI object
 623  *
 624  ******************************************************************************/
 625
 626 void
 627 acpi_ut_add_reference (
 628         union acpi_operand_object       *object)
 629 {
 630
 631         ACPI_FUNCTION_TRACE_PTR ("ut_add_reference", object);
 632
 633
 634         /* Ensure that we have a valid object */
 635
 636         if (!acpi_ut_valid_internal_object (object)) {
 637                 return_VOID;
 638         }
 639
 640         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
 641                 "Obj %p Current Refs=%X [To Be Incremented]\n",
 642                 object, object->common.reference_count));
 643
 644         /* Increment the reference count */
 645
 646         (void) acpi_ut_update_object_reference (object, REF_INCREMENT);
 647         return_VOID;
 648 }
 649
 650
 651 /*******************************************************************************
 652  *
 653  * FUNCTION:    acpi_ut_remove_reference
 654  *
 655  * PARAMETERS:  *Object        - Object whose ref count will be decremented
 656  *
 657  * RETURN:      None
 658  *
 659  * DESCRIPTION: Decrement the reference count of an ACPI internal object
 660  *
 661  ******************************************************************************/
 662
 663 void
 664 acpi_ut_remove_reference (
 665         union acpi_operand_object       *object)
 666 {
 667
 668         ACPI_FUNCTION_TRACE_PTR ("ut_remove_reference", object);
 669
 670
 671         /*
 672          * Allow a NULL pointer to be passed in, just ignore it.  This saves
 673          * each caller from having to check.  Also, ignore NS nodes.
 674          *
 675          */
 676         if (!object ||
 677                 (ACPI_GET_DESCRIPTOR_TYPE (object) == ACPI_DESC_TYPE_NAMED)) {
 678                 return_VOID;
 679         }
 680
 681         /* Ensure that we have a valid object */
 682
 683         if (!acpi_ut_valid_internal_object (object)) {
 684                 return_VOID;
 685         }
 686
 687         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
 688                 "Obj %p Current Refs=%X [To Be Decremented]\n",
 689                 object, object->common.reference_count));
 690
 691         /*
 692          * Decrement the reference count, and only actually delete the object
 693          * if the reference count becomes 0.  (Must also decrement the ref count
 694          * of all subobjects!)
 695          */
 696         (void) acpi_ut_update_object_reference (object, REF_DECREMENT);
 697         return_VOID;
 698 }
 699
 700