kernel/drivers/acpi/acpica/utdelete.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utdelete - object deletion and reference count utilities
   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 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acinterp.h"
  47 #include "acnamesp.h"
  48 #include "acevents.h"
  49
  50 #define _COMPONENT          ACPI_UTILITIES
  51 ACPI_MODULE_NAME("utdelete")
  52
  53 /* Local prototypes */
  54 static void acpi_ut_delete_internal_obj(union acpi_operand_object *object);
  55
  56 static void
  57 acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action);
  58
  59 /*******************************************************************************
  60  *
  61  * FUNCTION:    acpi_ut_delete_internal_obj
  62  *
  63  * PARAMETERS:  object         - Object to be deleted
  64  *
  65  * RETURN:      None
  66  *
  67  * DESCRIPTION: Low level object deletion, after reference counts have been
  68  *              updated (All reference counts, including sub-objects!)
  69  *
  70  ******************************************************************************/
  71
  72 static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
  73 {
  74         void *obj_pointer = NULL;
  75         union acpi_operand_object *handler_desc;
  76         union acpi_operand_object *second_desc;
  77         union acpi_operand_object *next_desc;
  78         union acpi_operand_object *start_desc;
  79         union acpi_operand_object **last_obj_ptr;
  80
  81         ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object);
  82
  83         if (!object) {
  84                 return_VOID;
  85         }
  86
  87         /*
  88          * Must delete or free any pointers within the object that are not
  89          * actual ACPI objects (for example, a raw buffer pointer).
  90          */
  91         switch (object->common.type) {
  92         case ACPI_TYPE_STRING:
  93
  94                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
  95                                   "**** String %p, ptr %p\n", object,
  96                                   object->string.pointer));
  97
  98                 /* Free the actual string buffer */
  99
 100                 if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
 101
 102                         /* But only if it is NOT a pointer into an ACPI table */
 103
 104                         obj_pointer = object->string.pointer;
 105                 }
 106                 break;
 107
 108         case ACPI_TYPE_BUFFER:
 109
 110                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 111                                   "**** Buffer %p, ptr %p\n", object,
 112                                   object->buffer.pointer));
 113
 114                 /* Free the actual buffer */
 115
 116                 if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
 117
 118                         /* But only if it is NOT a pointer into an ACPI table */
 119
 120                         obj_pointer = object->buffer.pointer;
 121                 }
 122                 break;
 123
 124         case ACPI_TYPE_PACKAGE:
 125
 126                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 127                                   " **** Package of count %X\n",
 128                                   object->package.count));
 129
 130                 /*
 131                  * Elements of the package are not handled here, they are deleted
 132                  * separately
 133                  */
 134
 135                 /* Free the (variable length) element pointer array */
 136
 137                 obj_pointer = object->package.elements;
 138                 break;
 139
 140                 /*
 141                  * These objects have a possible list of notify handlers.
 142                  * Device object also may have a GPE block.
 143                  */
 144         case ACPI_TYPE_DEVICE:
 145
 146                 if (object->device.gpe_block) {
 147                         (void)acpi_ev_delete_gpe_block(object->device.
 148                                                        gpe_block);
 149                 }
 150
 151                 /*lint -fallthrough */
 152
 153         case ACPI_TYPE_PROCESSOR:
 154         case ACPI_TYPE_THERMAL:
 155
 156                 /* Walk the address handler list for this object */
 157
 158                 handler_desc = object->common_notify.handler;
 159                 while (handler_desc) {
 160                         next_desc = handler_desc->address_space.next;
 161                         acpi_ut_remove_reference(handler_desc);
 162                         handler_desc = next_desc;
 163                 }
 164                 break;
 165
 166         case ACPI_TYPE_MUTEX:
 167
 168                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 169                                   "***** Mutex %p, OS Mutex %p\n",
 170                                   object, object->mutex.os_mutex));
 171
 172                 if (object == acpi_gbl_global_lock_mutex) {
 173
 174                         /* Global Lock has extra semaphore */
 175
 176                         (void)
 177                             acpi_os_delete_semaphore
 178                             (acpi_gbl_global_lock_semaphore);
 179                         acpi_gbl_global_lock_semaphore = NULL;
 180
 181                         acpi_os_delete_mutex(object->mutex.os_mutex);
 182                         acpi_gbl_global_lock_mutex = NULL;
 183                 } else {
 184                         acpi_ex_unlink_mutex(object);
 185                         acpi_os_delete_mutex(object->mutex.os_mutex);
 186                 }
 187                 break;
 188
 189         case ACPI_TYPE_EVENT:
 190
 191                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 192                                   "***** Event %p, OS Semaphore %p\n",
 193                                   object, object->event.os_semaphore));
 194
 195                 (void)acpi_os_delete_semaphore(object->event.os_semaphore);
 196                 object->event.os_semaphore = NULL;
 197                 break;
 198
 199         case ACPI_TYPE_METHOD:
 200
 201                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 202                                   "***** Method %p\n", object));
 203
 204                 /* Delete the method mutex if it exists */
 205
 206                 if (object->method.mutex) {
 207                         acpi_os_delete_mutex(object->method.mutex->mutex.
 208                                              os_mutex);
 209                         acpi_ut_delete_object_desc(object->method.mutex);
 210                         object->method.mutex = NULL;
 211                 }
 212                 if (object->method.node) {
 213                         object->method.node = NULL;
 214                 }
 215                 break;
 216
 217         case ACPI_TYPE_REGION:
 218
 219                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 220                                   "***** Region %p\n", object));
 221
 222                 /*
 223                  * Update address_range list. However, only permanent regions
 224                  * are installed in this list. (Not created within a method)
 225                  */
 226                 if (!(object->region.node->flags & ANOBJ_TEMPORARY)) {
 227                         acpi_ut_remove_address_range(object->region.space_id,
 228                                                      object->region.node);
 229                 }
 230
 231                 second_desc = acpi_ns_get_secondary_object(object);
 232                 if (second_desc) {
 233                         /*
 234                          * Free the region_context if and only if the handler is one of the
 235                          * default handlers -- and therefore, we created the context object
 236                          * locally, it was not created by an external caller.
 237                          */
 238                         handler_desc = object->region.handler;
 239                         if (handler_desc) {
 240                                 next_desc =
 241                                     handler_desc->address_space.region_list;
 242                                 start_desc = next_desc;
 243                                 last_obj_ptr =
 244                                     &handler_desc->address_space.region_list;
 245
 246                                 /* Remove the region object from the handler list */
 247
 248                                 while (next_desc) {
 249                                         if (next_desc == object) {
 250                                                 *last_obj_ptr =
 251                                                     next_desc->region.next;
 252                                                 break;
 253                                         }
 254
 255                                         /* Walk the linked list of handlers */
 256
 257                                         last_obj_ptr = &next_desc->region.next;
 258                                         next_desc = next_desc->region.next;
 259
 260                                         /* Prevent infinite loop if list is corrupted */
 261
 262                                         if (next_desc == start_desc) {
 263                                                 ACPI_ERROR((AE_INFO,
 264                                                             "Circular region list in address handler object %p",
 265                                                             handler_desc));
 266                                                 return_VOID;
 267                                         }
 268                                 }
 269
 270                                 if (handler_desc->address_space.handler_flags &
 271                                     ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
 272
 273                                         /* Deactivate region and free region context */
 274
 275                                         if (handler_desc->address_space.setup) {
 276                                                 (void)handler_desc->
 277                                                     address_space.setup(object,
 278                                                                         ACPI_REGION_DEACTIVATE,
 279                                                                         handler_desc->
 280                                                                         address_space.
 281                                                                         context,
 282                                                                         &second_desc->
 283                                                                         extra.
 284                                                                         region_context);
 285                                         }
 286                                 }
 287
 288                                 acpi_ut_remove_reference(handler_desc);
 289                         }
 290
 291                         /* Now we can free the Extra object */
 292
 293                         acpi_ut_delete_object_desc(second_desc);
 294                 }
 295                 break;
 296
 297         case ACPI_TYPE_BUFFER_FIELD:
 298
 299                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 300                                   "***** Buffer Field %p\n", object));
 301
 302                 second_desc = acpi_ns_get_secondary_object(object);
 303                 if (second_desc) {
 304                         acpi_ut_delete_object_desc(second_desc);
 305                 }
 306                 break;
 307
 308         case ACPI_TYPE_LOCAL_BANK_FIELD:
 309
 310                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 311                                   "***** Bank Field %p\n", object));
 312
 313                 second_desc = acpi_ns_get_secondary_object(object);
 314                 if (second_desc) {
 315                         acpi_ut_delete_object_desc(second_desc);
 316                 }
 317                 break;
 318
 319         default:
 320
 321                 break;
 322         }
 323
 324         /* Free any allocated memory (pointer within the object) found above */
 325
 326         if (obj_pointer) {
 327                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 328                                   "Deleting Object Subptr %p\n", obj_pointer));
 329                 ACPI_FREE(obj_pointer);
 330         }
 331
 332         /* Now the object can be safely deleted */
 333
 334         ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
 335                           object, acpi_ut_get_object_type_name(object)));
 336
 337         acpi_ut_delete_object_desc(object);
 338         return_VOID;
 339 }
 340
 341 /*******************************************************************************
 342  *
 343  * FUNCTION:    acpi_ut_delete_internal_object_list
 344  *
 345  * PARAMETERS:  obj_list        - Pointer to the list to be deleted
 346  *
 347  * RETURN:      None
 348  *
 349  * DESCRIPTION: This function deletes an internal object list, including both
 350  *              simple objects and package objects
 351  *
 352  ******************************************************************************/
 353
 354 void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list)
 355 {
 356         union acpi_operand_object **internal_obj;
 357
 358         ACPI_FUNCTION_ENTRY();
 359
 360         /* Walk the null-terminated internal list */
 361
 362         for (internal_obj = obj_list; *internal_obj; internal_obj++) {
 363                 acpi_ut_remove_reference(*internal_obj);
 364         }
 365
 366         /* Free the combined parameter pointer list and object array */
 367
 368         ACPI_FREE(obj_list);
 369         return;
 370 }
 371
 372 /*******************************************************************************
 373  *
 374  * FUNCTION:    acpi_ut_update_ref_count
 375  *
 376  * PARAMETERS:  object          - Object whose ref count is to be updated
 377  *              action          - What to do (REF_INCREMENT or REF_DECREMENT)
 378  *
 379  * RETURN:      None. Sets new reference count within the object
 380  *
 381  * DESCRIPTION: Modify the reference count for an internal acpi object
 382  *
 383  ******************************************************************************/
 384
 385 static void
 386 acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action)
 387 {
 388         u16 original_count;
 389         u16 new_count = 0;
 390         acpi_cpu_flags lock_flags;
 391
 392         ACPI_FUNCTION_NAME(ut_update_ref_count);
 393
 394         if (!object) {
 395                 return;
 396         }
 397
 398         /*
 399          * Always get the reference count lock. Note: Interpreter and/or
 400          * Namespace is not always locked when this function is called.
 401          */
 402         lock_flags = acpi_os_acquire_lock(acpi_gbl_reference_count_lock);
 403         original_count = object->common.reference_count;
 404
 405         /* Perform the reference count action (increment, decrement) */
 406
 407         switch (action) {
 408         case REF_INCREMENT:
 409
 410                 new_count = original_count + 1;
 411                 object->common.reference_count = new_count;
 412                 acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags);
 413
 414                 /* The current reference count should never be zero here */
 415
 416                 if (!original_count) {
 417                         ACPI_WARNING((AE_INFO,
 418                                       "Obj %p, Reference Count was zero before increment\n",
 419                                       object));
 420                 }
 421
 422                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 423                                   "Obj %p Type %.2X Refs %.2X [Incremented]\n",
 424                                   object, object->common.type, new_count));
 425                 break;
 426
 427         case REF_DECREMENT:
 428
 429                 /* The current reference count must be non-zero */
 430
 431                 if (original_count) {
 432                         new_count = original_count - 1;
 433                         object->common.reference_count = new_count;
 434                 }
 435
 436                 acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags);
 437
 438                 if (!original_count) {
 439                         ACPI_WARNING((AE_INFO,
 440                                       "Obj %p, Reference Count is already zero, cannot decrement\n",
 441                                       object));
 442                 }
 443
 444                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 445                                   "Obj %p Type %.2X Refs %.2X [Decremented]\n",
 446                                   object, object->common.type, new_count));
 447
 448                 /* Actually delete the object on a reference count of zero */
 449
 450                 if (new_count == 0) {
 451                         acpi_ut_delete_internal_obj(object);
 452                 }
 453                 break;
 454
 455         default:
 456
 457                 acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags);
 458                 ACPI_ERROR((AE_INFO, "Unknown Reference Count action (0x%X)",
 459                             action));
 460                 return;
 461         }
 462
 463         /*
 464          * Sanity check the reference count, for debug purposes only.
 465          * (A deleted object will have a huge reference count)
 466          */
 467         if (new_count > ACPI_MAX_REFERENCE_COUNT) {
 468                 ACPI_WARNING((AE_INFO,
 469                               "Large Reference Count (0x%X) in object %p, Type=0x%.2X",
 470                               new_count, object, object->common.type));
 471         }
 472 }
 473
 474 /*******************************************************************************
 475  *
 476  * FUNCTION:    acpi_ut_update_object_reference
 477  *
 478  * PARAMETERS:  object              - Increment ref count for this object
 479  *                                    and all sub-objects
 480  *              action              - Either REF_INCREMENT or REF_DECREMENT
 481  *
 482  * RETURN:      Status
 483  *
 484  * DESCRIPTION: Increment the object reference count
 485  *
 486  * Object references are incremented when:
 487  * 1) An object is attached to a Node (namespace object)
 488  * 2) An object is copied (all subobjects must be incremented)
 489  *
 490  * Object references are decremented when:
 491  * 1) An object is detached from an Node
 492  *
 493  ******************************************************************************/
 494
 495 acpi_status
 496 acpi_ut_update_object_reference(union acpi_operand_object *object, u16 action)
 497 {
 498         acpi_status status = AE_OK;
 499         union acpi_generic_state *state_list = NULL;
 500         union acpi_operand_object *next_object = NULL;
 501         union acpi_operand_object *prev_object;
 502         union acpi_generic_state *state;
 503         u32 i;
 504
 505         ACPI_FUNCTION_NAME(ut_update_object_reference);
 506
 507         while (object) {
 508
 509                 /* Make sure that this isn't a namespace handle */
 510
 511                 if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) {
 512                         ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 513                                           "Object %p is NS handle\n", object));
 514                         return (AE_OK);
 515                 }
 516
 517                 /*
 518                  * All sub-objects must have their reference count incremented also.
 519                  * Different object types have different subobjects.
 520                  */
 521                 switch (object->common.type) {
 522                 case ACPI_TYPE_DEVICE:
 523                 case ACPI_TYPE_PROCESSOR:
 524                 case ACPI_TYPE_POWER:
 525                 case ACPI_TYPE_THERMAL:
 526                         /*
 527                          * Update the notify objects for these types (if present)
 528                          * Two lists, system and device notify handlers.
 529                          */
 530                         for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
 531                                 prev_object =
 532                                     object->common_notify.notify_list[i];
 533                                 while (prev_object) {
 534                                         next_object =
 535                                             prev_object->notify.next[i];
 536                                         acpi_ut_update_ref_count(prev_object,
 537                                                                  action);
 538                                         prev_object = next_object;
 539                                 }
 540                         }
 541                         break;
 542
 543                 case ACPI_TYPE_PACKAGE:
 544                         /*
 545                          * We must update all the sub-objects of the package,
 546                          * each of whom may have their own sub-objects.
 547                          */
 548                         for (i = 0; i < object->package.count; i++) {
 549                                 /*
 550                                  * Null package elements are legal and can be simply
 551                                  * ignored.
 552                                  */
 553                                 next_object = object->package.elements[i];
 554                                 if (!next_object) {
 555                                         continue;
 556                                 }
 557
 558                                 switch (next_object->common.type) {
 559                                 case ACPI_TYPE_INTEGER:
 560                                 case ACPI_TYPE_STRING:
 561                                 case ACPI_TYPE_BUFFER:
 562                                         /*
 563                                          * For these very simple sub-objects, we can just
 564                                          * update the reference count here and continue.
 565                                          * Greatly increases performance of this operation.
 566                                          */
 567                                         acpi_ut_update_ref_count(next_object,
 568                                                                  action);
 569                                         break;
 570
 571                                 default:
 572                                         /*
 573                                          * For complex sub-objects, push them onto the stack
 574                                          * for later processing (this eliminates recursion.)
 575                                          */
 576                                         status =
 577                                             acpi_ut_create_update_state_and_push
 578                                             (next_object, action, &state_list);
 579                                         if (ACPI_FAILURE(status)) {
 580                                                 goto error_exit;
 581                                         }
 582                                         break;
 583                                 }
 584                         }
 585                         next_object = NULL;
 586                         break;
 587
 588                 case ACPI_TYPE_BUFFER_FIELD:
 589
 590                         next_object = object->buffer_field.buffer_obj;
 591                         break;
 592
 593                 case ACPI_TYPE_LOCAL_REGION_FIELD:
 594
 595                         next_object = object->field.region_obj;
 596                         break;
 597
 598                 case ACPI_TYPE_LOCAL_BANK_FIELD:
 599
 600                         next_object = object->bank_field.bank_obj;
 601                         status =
 602                             acpi_ut_create_update_state_and_push(object->
 603                                                                  bank_field.
 604                                                                  region_obj,
 605                                                                  action,
 606                                                                  &state_list);
 607                         if (ACPI_FAILURE(status)) {
 608                                 goto error_exit;
 609                         }
 610                         break;
 611
 612                 case ACPI_TYPE_LOCAL_INDEX_FIELD:
 613
 614                         next_object = object->index_field.index_obj;
 615                         status =
 616                             acpi_ut_create_update_state_and_push(object->
 617                                                                  index_field.
 618                                                                  data_obj,
 619                                                                  action,
 620                                                                  &state_list);
 621                         if (ACPI_FAILURE(status)) {
 622                                 goto error_exit;
 623                         }
 624                         break;
 625
 626                 case ACPI_TYPE_LOCAL_REFERENCE:
 627                         /*
 628                          * The target of an Index (a package, string, or buffer) or a named
 629                          * reference must track changes to the ref count of the index or
 630                          * target object.
 631                          */
 632                         if ((object->reference.class == ACPI_REFCLASS_INDEX) ||
 633                             (object->reference.class == ACPI_REFCLASS_NAME)) {
 634                                 next_object = object->reference.object;
 635                         }
 636                         break;
 637
 638                 case ACPI_TYPE_REGION:
 639                 default:
 640
 641                         break;  /* No subobjects for all other types */
 642                 }
 643
 644                 /*
 645                  * Now we can update the count in the main object. This can only
 646                  * happen after we update the sub-objects in case this causes the
 647                  * main object to be deleted.
 648                  */
 649                 acpi_ut_update_ref_count(object, action);
 650                 object = NULL;
 651
 652                 /* Move on to the next object to be updated */
 653
 654                 if (next_object) {
 655                         object = next_object;
 656                         next_object = NULL;
 657                 } else if (state_list) {
 658                         state = acpi_ut_pop_generic_state(&state_list);
 659                         object = state->update.object;
 660                         acpi_ut_delete_generic_state(state);
 661                 }
 662         }
 663
 664         return (AE_OK);
 665
 666 error_exit:
 667
 668         ACPI_EXCEPTION((AE_INFO, status,
 669                         "Could not update object reference count"));
 670
 671         /* Free any stacked Update State objects */
 672
 673         while (state_list) {
 674                 state = acpi_ut_pop_generic_state(&state_list);
 675                 acpi_ut_delete_generic_state(state);
 676         }
 677
 678         return (status);
 679 }
 680
 681 /*******************************************************************************
 682  *
 683  * FUNCTION:    acpi_ut_add_reference
 684  *
 685  * PARAMETERS:  object          - Object whose reference count is to be
 686  *                                incremented
 687  *
 688  * RETURN:      None
 689  *
 690  * DESCRIPTION: Add one reference to an ACPI object
 691  *
 692  ******************************************************************************/
 693
 694 void acpi_ut_add_reference(union acpi_operand_object *object)
 695 {
 696
 697         ACPI_FUNCTION_NAME(ut_add_reference);
 698
 699         /* Ensure that we have a valid object */
 700
 701         if (!acpi_ut_valid_internal_object(object)) {
 702                 return;
 703         }
 704
 705         ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 706                           "Obj %p Current Refs=%X [To Be Incremented]\n",
 707                           object, object->common.reference_count));
 708
 709         /* Increment the reference count */
 710
 711         (void)acpi_ut_update_object_reference(object, REF_INCREMENT);
 712         return;
 713 }
 714
 715 /*******************************************************************************
 716  *
 717  * FUNCTION:    acpi_ut_remove_reference
 718  *
 719  * PARAMETERS:  object         - Object whose ref count will be decremented
 720  *
 721  * RETURN:      None
 722  *
 723  * DESCRIPTION: Decrement the reference count of an ACPI internal object
 724  *
 725  ******************************************************************************/
 726
 727 void acpi_ut_remove_reference(union acpi_operand_object *object)
 728 {
 729
 730         ACPI_FUNCTION_NAME(ut_remove_reference);
 731
 732         /*
 733          * Allow a NULL pointer to be passed in, just ignore it. This saves
 734          * each caller from having to check. Also, ignore NS nodes.
 735          */
 736         if (!object ||
 737             (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) {
 738                 return;
 739         }
 740
 741         /* Ensure that we have a valid object */
 742
 743         if (!acpi_ut_valid_internal_object(object)) {
 744                 return;
 745         }
 746
 747         ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 748                           "Obj %p Current Refs=%X [To Be Decremented]\n",
 749                           object, object->common.reference_count));
 750
 751         /*
 752          * Decrement the reference count, and only actually delete the object
 753          * if the reference count becomes 0. (Must also decrement the ref count
 754          * of all subobjects!)
 755          */
 756         (void)acpi_ut_update_object_reference(object, REF_DECREMENT);
 757         return;
 758 }