blob: 1079a1a1f195390312f959be5d7660c9e72efeb4 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*******************************************************************************
2 *
3 * Module Name: utdelete - object deletion and reference count utilities
4 *
5 ******************************************************************************/
6
7/*
Bob Moore4a90c7e2006-01-13 16:22:00 -05008 * Copyright (C) 2000 - 2006, R. Byron Moore
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <acpi/acpi.h>
45#include <acpi/acinterp.h>
46#include <acpi/acnamesp.h>
47#include <acpi/acevents.h>
48#include <acpi/amlcode.h>
49
50#define _COMPONENT ACPI_UTILITIES
Len Brown4be44fc2005-08-05 00:44:28 -040051ACPI_MODULE_NAME("utdelete")
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Robert Moore44f6c012005-04-18 22:49:35 -040053/* Local prototypes */
Len Brown4be44fc2005-08-05 00:44:28 -040054static void acpi_ut_delete_internal_obj(union acpi_operand_object *object);
Robert Moore44f6c012005-04-18 22:49:35 -040055
56static void
Len Brown4be44fc2005-08-05 00:44:28 -040057acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59/*******************************************************************************
60 *
61 * FUNCTION: acpi_ut_delete_internal_obj
62 *
Robert Moore44f6c012005-04-18 22:49:35 -040063 * PARAMETERS: Object - Object to be deleted
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 *
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
Len Brown4be44fc2005-08-05 00:44:28 -040072static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
Len Brown4be44fc2005-08-05 00:44:28 -040074 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Len Brown4be44fc2005-08-05 00:44:28 -040079 ACPI_FUNCTION_TRACE_PTR("ut_delete_internal_obj", object);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
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 */
Len Brown4be44fc2005-08-05 00:44:28 -040089 switch (ACPI_GET_OBJECT_TYPE(object)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 case ACPI_TYPE_STRING:
91
Len Brown4be44fc2005-08-05 00:44:28 -040092 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
93 "**** String %p, ptr %p\n", object,
94 object->string.pointer));
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96 /* Free the actual string buffer */
97
98 if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
99 /* But only if it is NOT a pointer into an ACPI table */
100
101 obj_pointer = object->string.pointer;
102 }
103 break;
104
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 case ACPI_TYPE_BUFFER:
106
Len Brown4be44fc2005-08-05 00:44:28 -0400107 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
108 "**** Buffer %p, ptr %p\n", object,
109 object->buffer.pointer));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111 /* Free the actual buffer */
112
113 if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
114 /* But only if it is NOT a pointer into an ACPI table */
115
116 obj_pointer = object->buffer.pointer;
117 }
118 break;
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 case ACPI_TYPE_PACKAGE:
121
Len Brown4be44fc2005-08-05 00:44:28 -0400122 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
123 " **** Package of count %X\n",
124 object->package.count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 /*
127 * Elements of the package are not handled here, they are deleted
128 * separately
129 */
130
131 /* Free the (variable length) element pointer array */
132
133 obj_pointer = object->package.elements;
134 break;
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 case ACPI_TYPE_DEVICE:
137
138 if (object->device.gpe_block) {
Len Brown4be44fc2005-08-05 00:44:28 -0400139 (void)acpi_ev_delete_gpe_block(object->device.
140 gpe_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 }
142
143 /* Walk the handler list for this device */
144
145 handler_desc = object->device.handler;
146 while (handler_desc) {
147 next_desc = handler_desc->address_space.next;
Len Brown4be44fc2005-08-05 00:44:28 -0400148 acpi_ut_remove_reference(handler_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 handler_desc = next_desc;
150 }
151 break;
152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 case ACPI_TYPE_MUTEX:
154
Len Brown4be44fc2005-08-05 00:44:28 -0400155 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
156 "***** Mutex %p, Semaphore %p\n",
157 object, object->mutex.semaphore));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Len Brown4be44fc2005-08-05 00:44:28 -0400159 acpi_ex_unlink_mutex(object);
160 (void)acpi_os_delete_semaphore(object->mutex.semaphore);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 break;
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 case ACPI_TYPE_EVENT:
164
Len Brown4be44fc2005-08-05 00:44:28 -0400165 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
166 "***** Event %p, Semaphore %p\n",
167 object, object->event.semaphore));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Len Brown4be44fc2005-08-05 00:44:28 -0400169 (void)acpi_os_delete_semaphore(object->event.semaphore);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 object->event.semaphore = NULL;
171 break;
172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 case ACPI_TYPE_METHOD:
174
Len Brown4be44fc2005-08-05 00:44:28 -0400175 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
176 "***** Method %p\n", object));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
178 /* Delete the method semaphore if it exists */
179
180 if (object->method.semaphore) {
Len Brown4be44fc2005-08-05 00:44:28 -0400181 (void)acpi_os_delete_semaphore(object->method.
182 semaphore);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 object->method.semaphore = NULL;
184 }
185 break;
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 case ACPI_TYPE_REGION:
188
Len Brown4be44fc2005-08-05 00:44:28 -0400189 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
190 "***** Region %p\n", object));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Len Brown4be44fc2005-08-05 00:44:28 -0400192 second_desc = acpi_ns_get_secondary_object(object);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 if (second_desc) {
194 /*
195 * Free the region_context if and only if the handler is one of the
196 * default handlers -- and therefore, we created the context object
197 * locally, it was not created by an external caller.
198 */
199 handler_desc = object->region.handler;
200 if (handler_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -0400201 if (handler_desc->address_space.
202 hflags &
203 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
204 obj_pointer =
205 second_desc->extra.region_context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 }
207
Len Brown4be44fc2005-08-05 00:44:28 -0400208 acpi_ut_remove_reference(handler_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 }
210
211 /* Now we can free the Extra object */
212
Len Brown4be44fc2005-08-05 00:44:28 -0400213 acpi_ut_delete_object_desc(second_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 }
215 break;
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 case ACPI_TYPE_BUFFER_FIELD:
218
Len Brown4be44fc2005-08-05 00:44:28 -0400219 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
220 "***** Buffer Field %p\n", object));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Len Brown4be44fc2005-08-05 00:44:28 -0400222 second_desc = acpi_ns_get_secondary_object(object);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 if (second_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -0400224 acpi_ut_delete_object_desc(second_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 }
226 break;
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 default:
229 break;
230 }
231
232 /* Free any allocated memory (pointer within the object) found above */
233
234 if (obj_pointer) {
Len Brown4be44fc2005-08-05 00:44:28 -0400235 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
236 "Deleting Object Subptr %p\n", obj_pointer));
237 ACPI_MEM_FREE(obj_pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 }
239
240 /* Now the object can be safely deleted */
241
Len Brown4be44fc2005-08-05 00:44:28 -0400242 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
243 object, acpi_ut_get_object_type_name(object)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Len Brown4be44fc2005-08-05 00:44:28 -0400245 acpi_ut_delete_object_desc(object);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 return_VOID;
247}
248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249/*******************************************************************************
250 *
251 * FUNCTION: acpi_ut_delete_internal_object_list
252 *
Robert Moore44f6c012005-04-18 22:49:35 -0400253 * PARAMETERS: obj_list - Pointer to the list to be deleted
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 *
255 * RETURN: None
256 *
257 * DESCRIPTION: This function deletes an internal object list, including both
258 * simple objects and package objects
259 *
260 ******************************************************************************/
261
Len Brown4be44fc2005-08-05 00:44:28 -0400262void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
Len Brown4be44fc2005-08-05 00:44:28 -0400264 union acpi_operand_object **internal_obj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
Len Brown4be44fc2005-08-05 00:44:28 -0400266 ACPI_FUNCTION_TRACE("ut_delete_internal_object_list");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
268 /* Walk the null-terminated internal list */
269
270 for (internal_obj = obj_list; *internal_obj; internal_obj++) {
Len Brown4be44fc2005-08-05 00:44:28 -0400271 acpi_ut_remove_reference(*internal_obj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273
274 /* Free the combined parameter pointer list and object array */
275
Len Brown4be44fc2005-08-05 00:44:28 -0400276 ACPI_MEM_FREE(obj_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return_VOID;
278}
279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280/*******************************************************************************
281 *
282 * FUNCTION: acpi_ut_update_ref_count
283 *
Robert Moore44f6c012005-04-18 22:49:35 -0400284 * PARAMETERS: Object - Object whose ref count is to be updated
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 * Action - What to do
286 *
287 * RETURN: New ref count
288 *
289 * DESCRIPTION: Modify the ref count and return it.
290 *
291 ******************************************************************************/
292
293static void
Len Brown4be44fc2005-08-05 00:44:28 -0400294acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295{
Len Brown4be44fc2005-08-05 00:44:28 -0400296 u16 count;
297 u16 new_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Len Brown4be44fc2005-08-05 00:44:28 -0400299 ACPI_FUNCTION_NAME("ut_update_ref_count");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
301 if (!object) {
302 return;
303 }
304
305 count = object->common.reference_count;
306 new_count = count;
307
308 /*
Robert Moore44f6c012005-04-18 22:49:35 -0400309 * Perform the reference count action
310 * (increment, decrement, or force delete)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 */
312 switch (action) {
313
314 case REF_INCREMENT:
315
316 new_count++;
317 object->common.reference_count = new_count;
318
Len Brown4be44fc2005-08-05 00:44:28 -0400319 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
320 "Obj %p Refs=%X, [Incremented]\n",
321 object, new_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 break;
323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 case REF_DECREMENT:
325
326 if (count < 1) {
Len Brown4be44fc2005-08-05 00:44:28 -0400327 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
328 "Obj %p Refs=%X, can't decrement! (Set to 0)\n",
329 object, new_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331 new_count = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400332 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 new_count--;
334
Len Brown4be44fc2005-08-05 00:44:28 -0400335 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
336 "Obj %p Refs=%X, [Decremented]\n",
337 object, new_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 }
339
Len Brown4be44fc2005-08-05 00:44:28 -0400340 if (ACPI_GET_OBJECT_TYPE(object) == ACPI_TYPE_METHOD) {
341 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
342 "Method Obj %p Refs=%X, [Decremented]\n",
343 object, new_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 }
345
346 object->common.reference_count = new_count;
347 if (new_count == 0) {
Len Brown4be44fc2005-08-05 00:44:28 -0400348 acpi_ut_delete_internal_obj(object);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 }
350
351 break;
352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 case REF_FORCE_DELETE:
354
Len Brown4be44fc2005-08-05 00:44:28 -0400355 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
356 "Obj %p Refs=%X, Force delete! (Set to 0)\n",
357 object, count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
359 new_count = 0;
360 object->common.reference_count = new_count;
Len Brown4be44fc2005-08-05 00:44:28 -0400361 acpi_ut_delete_internal_obj(object);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 break;
363
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 default:
365
Bob Moore4a90c7e2006-01-13 16:22:00 -0500366 ACPI_REPORT_ERROR(("Unknown action (%X)\n", action));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 break;
368 }
369
370 /*
371 * Sanity check the reference count, for debug purposes only.
372 * (A deleted object will have a huge reference count)
373 */
374 if (count > ACPI_MAX_REFERENCE_COUNT) {
375
Bob Moore4a90c7e2006-01-13 16:22:00 -0500376 ACPI_REPORT_WARNING(("Large Reference Count (%X) in object %p\n\n", count, object));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 }
378
379 return;
380}
381
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382/*******************************************************************************
383 *
384 * FUNCTION: acpi_ut_update_object_reference
385 *
Robert Moore44f6c012005-04-18 22:49:35 -0400386 * PARAMETERS: Object - Increment ref count for this object
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 * and all sub-objects
388 * Action - Either REF_INCREMENT or REF_DECREMENT or
389 * REF_FORCE_DELETE
390 *
391 * RETURN: Status
392 *
393 * DESCRIPTION: Increment the object reference count
394 *
395 * Object references are incremented when:
396 * 1) An object is attached to a Node (namespace object)
397 * 2) An object is copied (all subobjects must be incremented)
398 *
399 * Object references are decremented when:
400 * 1) An object is detached from an Node
401 *
402 ******************************************************************************/
403
404acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400405acpi_ut_update_object_reference(union acpi_operand_object * object, u16 action)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406{
Len Brown4be44fc2005-08-05 00:44:28 -0400407 acpi_status status = AE_OK;
408 union acpi_generic_state *state_list = NULL;
409 union acpi_operand_object *next_object = NULL;
410 union acpi_generic_state *state;
411 acpi_native_uint i;
David Shaohua Li4c3ffbd2005-07-14 00:00:00 -0400412
Len Brown4be44fc2005-08-05 00:44:28 -0400413 ACPI_FUNCTION_TRACE_PTR("ut_update_object_reference", object);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
Robert Mooref9f46012005-07-08 00:00:00 -0400415 while (object) {
416 /* Make sure that this isn't a namespace handle */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
Len Brown4be44fc2005-08-05 00:44:28 -0400418 if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) {
419 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
420 "Object %p is NS handle\n", object));
421 return_ACPI_STATUS(AE_OK);
Robert Mooref9f46012005-07-08 00:00:00 -0400422 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
424 /*
425 * All sub-objects must have their reference count incremented also.
426 * Different object types have different subobjects.
427 */
Len Brown4be44fc2005-08-05 00:44:28 -0400428 switch (ACPI_GET_OBJECT_TYPE(object)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 case ACPI_TYPE_DEVICE:
430
Len Brown4be44fc2005-08-05 00:44:28 -0400431 acpi_ut_update_ref_count(object->device.system_notify,
432 action);
433 acpi_ut_update_ref_count(object->device.device_notify,
434 action);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 break;
436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 case ACPI_TYPE_PACKAGE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 /*
Robert Mooref9f46012005-07-08 00:00:00 -0400439 * We must update all the sub-objects of the package,
440 * each of whom may have their own sub-objects.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 */
442 for (i = 0; i < object->package.count; i++) {
443 /*
444 * Push each element onto the stack for later processing.
445 * Note: There can be null elements within the package,
446 * these are simply ignored
447 */
Len Brown4be44fc2005-08-05 00:44:28 -0400448 status =
449 acpi_ut_create_update_state_and_push
450 (object->package.elements[i], action,
451 &state_list);
452 if (ACPI_FAILURE(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 goto error_exit;
454 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 }
456 break;
457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 case ACPI_TYPE_BUFFER_FIELD:
459
Robert Mooref9f46012005-07-08 00:00:00 -0400460 next_object = object->buffer_field.buffer_obj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 break;
462
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 case ACPI_TYPE_LOCAL_REGION_FIELD:
464
Robert Mooref9f46012005-07-08 00:00:00 -0400465 next_object = object->field.region_obj;
466 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
468 case ACPI_TYPE_LOCAL_BANK_FIELD:
469
Robert Mooref9f46012005-07-08 00:00:00 -0400470 next_object = object->bank_field.bank_obj;
Len Brown4be44fc2005-08-05 00:44:28 -0400471 status =
472 acpi_ut_create_update_state_and_push(object->
473 bank_field.
474 region_obj,
475 action,
476 &state_list);
477 if (ACPI_FAILURE(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 goto error_exit;
479 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 break;
481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 case ACPI_TYPE_LOCAL_INDEX_FIELD:
483
Robert Mooref9f46012005-07-08 00:00:00 -0400484 next_object = object->index_field.index_obj;
Len Brown4be44fc2005-08-05 00:44:28 -0400485 status =
486 acpi_ut_create_update_state_and_push(object->
487 index_field.
488 data_obj,
489 action,
490 &state_list);
491 if (ACPI_FAILURE(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 goto error_exit;
493 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 break;
495
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 case ACPI_TYPE_LOCAL_REFERENCE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 /*
498 * The target of an Index (a package, string, or buffer) must track
499 * changes to the ref count of the index.
500 */
501 if (object->reference.opcode == AML_INDEX_OP) {
Robert Mooref9f46012005-07-08 00:00:00 -0400502 next_object = object->reference.object;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 }
504 break;
505
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 case ACPI_TYPE_REGION:
507 default:
Len Brown4be44fc2005-08-05 00:44:28 -0400508 break; /* No subobjects */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 }
510
511 /*
512 * Now we can update the count in the main object. This can only
513 * happen after we update the sub-objects in case this causes the
514 * main object to be deleted.
515 */
Len Brown4be44fc2005-08-05 00:44:28 -0400516 acpi_ut_update_ref_count(object, action);
Robert Mooref9f46012005-07-08 00:00:00 -0400517 object = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519 /* Move on to the next object to be updated */
520
Robert Mooref9f46012005-07-08 00:00:00 -0400521 if (next_object) {
522 object = next_object;
523 next_object = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400524 } else if (state_list) {
525 state = acpi_ut_pop_generic_state(&state_list);
Robert Mooref9f46012005-07-08 00:00:00 -0400526 object = state->update.object;
Len Brown4be44fc2005-08-05 00:44:28 -0400527 acpi_ut_delete_generic_state(state);
Robert Mooref9f46012005-07-08 00:00:00 -0400528 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 }
530
Len Brown4be44fc2005-08-05 00:44:28 -0400531 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
Len Brown4be44fc2005-08-05 00:44:28 -0400533 error_exit:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
Len Brown4be44fc2005-08-05 00:44:28 -0400535 ACPI_REPORT_ERROR(("Could not update object reference count, %s\n",
536 acpi_format_exception(status)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Len Brown4be44fc2005-08-05 00:44:28 -0400538 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539}
540
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541/*******************************************************************************
542 *
543 * FUNCTION: acpi_ut_add_reference
544 *
Robert Moore44f6c012005-04-18 22:49:35 -0400545 * PARAMETERS: Object - Object whose reference count is to be
546 * incremented
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 *
548 * RETURN: None
549 *
550 * DESCRIPTION: Add one reference to an ACPI object
551 *
552 ******************************************************************************/
553
Len Brown4be44fc2005-08-05 00:44:28 -0400554void acpi_ut_add_reference(union acpi_operand_object *object)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555{
556
Len Brown4be44fc2005-08-05 00:44:28 -0400557 ACPI_FUNCTION_TRACE_PTR("ut_add_reference", object);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
559 /* Ensure that we have a valid object */
560
Len Brown4be44fc2005-08-05 00:44:28 -0400561 if (!acpi_ut_valid_internal_object(object)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 return_VOID;
563 }
564
Len Brown4be44fc2005-08-05 00:44:28 -0400565 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
566 "Obj %p Current Refs=%X [To Be Incremented]\n",
567 object, object->common.reference_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
569 /* Increment the reference count */
570
Len Brown4be44fc2005-08-05 00:44:28 -0400571 (void)acpi_ut_update_object_reference(object, REF_INCREMENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 return_VOID;
573}
574
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575/*******************************************************************************
576 *
577 * FUNCTION: acpi_ut_remove_reference
578 *
Robert Moore44f6c012005-04-18 22:49:35 -0400579 * PARAMETERS: Object - Object whose ref count will be decremented
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 *
581 * RETURN: None
582 *
583 * DESCRIPTION: Decrement the reference count of an ACPI internal object
584 *
585 ******************************************************************************/
586
Len Brown4be44fc2005-08-05 00:44:28 -0400587void acpi_ut_remove_reference(union acpi_operand_object *object)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588{
589
Len Brown4be44fc2005-08-05 00:44:28 -0400590 ACPI_FUNCTION_TRACE_PTR("ut_remove_reference", object);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
592 /*
593 * Allow a NULL pointer to be passed in, just ignore it. This saves
594 * each caller from having to check. Also, ignore NS nodes.
595 *
596 */
597 if (!object ||
Len Brown4be44fc2005-08-05 00:44:28 -0400598 (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 return_VOID;
600 }
601
602 /* Ensure that we have a valid object */
603
Len Brown4be44fc2005-08-05 00:44:28 -0400604 if (!acpi_ut_valid_internal_object(object)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 return_VOID;
606 }
607
Len Brown4be44fc2005-08-05 00:44:28 -0400608 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
609 "Obj %p Current Refs=%X [To Be Decremented]\n",
610 object, object->common.reference_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
612 /*
613 * Decrement the reference count, and only actually delete the object
614 * if the reference count becomes 0. (Must also decrement the ref count
615 * of all subobjects!)
616 */
Len Brown4be44fc2005-08-05 00:44:28 -0400617 (void)acpi_ut_update_object_reference(object, REF_DECREMENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 return_VOID;
619}