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1/*******************************************************************************
2 *
3 * Module Name: utmutex - local mutex support
4 *
5 ******************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2012, 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
47#define _COMPONENT ACPI_UTILITIES
48ACPI_MODULE_NAME("utmutex")
49
50/* Local prototypes */
51static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id);
52
53static void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id);
54
55/*******************************************************************************
56 *
57 * FUNCTION: acpi_ut_mutex_initialize
58 *
59 * PARAMETERS: None.
60 *
61 * RETURN: Status
62 *
63 * DESCRIPTION: Create the system mutex objects. This includes mutexes,
64 * spin locks, and reader/writer locks.
65 *
66 ******************************************************************************/
67
68acpi_status acpi_ut_mutex_initialize(void)
69{
70 u32 i;
71 acpi_status status;
72
73 ACPI_FUNCTION_TRACE(ut_mutex_initialize);
74
75 /* Create each of the predefined mutex objects */
76
77 for (i = 0; i < ACPI_NUM_MUTEX; i++) {
78 status = acpi_ut_create_mutex(i);
79 if (ACPI_FAILURE(status)) {
80 return_ACPI_STATUS(status);
81 }
82 }
83
84 /* Create the spinlocks for use at interrupt level */
85
86 status = acpi_os_create_lock (&acpi_gbl_gpe_lock);
87 if (ACPI_FAILURE (status)) {
88 return_ACPI_STATUS (status);
89 }
90
91 status = acpi_os_create_lock (&acpi_gbl_hardware_lock);
92 if (ACPI_FAILURE (status)) {
93 return_ACPI_STATUS (status);
94 }
95
96 /* Mutex for _OSI support */
97 status = acpi_os_create_mutex(&acpi_gbl_osi_mutex);
98 if (ACPI_FAILURE(status)) {
99 return_ACPI_STATUS(status);
100 }
101
102 /* Create the reader/writer lock for namespace access */
103
104 status = acpi_ut_create_rw_lock(&acpi_gbl_namespace_rw_lock);
105 return_ACPI_STATUS(status);
106}
107
108/*******************************************************************************
109 *
110 * FUNCTION: acpi_ut_mutex_terminate
111 *
112 * PARAMETERS: None.
113 *
114 * RETURN: None.
115 *
116 * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
117 * spin locks, and reader/writer locks.
118 *
119 ******************************************************************************/
120
121void acpi_ut_mutex_terminate(void)
122{
123 u32 i;
124
125 ACPI_FUNCTION_TRACE(ut_mutex_terminate);
126
127 /* Delete each predefined mutex object */
128
129 for (i = 0; i < ACPI_NUM_MUTEX; i++) {
130 acpi_ut_delete_mutex(i);
131 }
132
133 acpi_os_delete_mutex(acpi_gbl_osi_mutex);
134
135 /* Delete the spinlocks */
136
137 acpi_os_delete_lock(acpi_gbl_gpe_lock);
138 acpi_os_delete_lock(acpi_gbl_hardware_lock);
139
140 /* Delete the reader/writer lock */
141
142 acpi_ut_delete_rw_lock(&acpi_gbl_namespace_rw_lock);
143 return_VOID;
144}
145
146/*******************************************************************************
147 *
148 * FUNCTION: acpi_ut_create_mutex
149 *
150 * PARAMETERS: mutex_iD - ID of the mutex to be created
151 *
152 * RETURN: Status
153 *
154 * DESCRIPTION: Create a mutex object.
155 *
156 ******************************************************************************/
157
158static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id)
159{
160 acpi_status status = AE_OK;
161
162 ACPI_FUNCTION_TRACE_U32(ut_create_mutex, mutex_id);
163
164 if (!acpi_gbl_mutex_info[mutex_id].mutex) {
165 status =
166 acpi_os_create_mutex(&acpi_gbl_mutex_info[mutex_id].mutex);
167 acpi_gbl_mutex_info[mutex_id].thread_id =
168 ACPI_MUTEX_NOT_ACQUIRED;
169 acpi_gbl_mutex_info[mutex_id].use_count = 0;
170 }
171
172 return_ACPI_STATUS(status);
173}
174
175/*******************************************************************************
176 *
177 * FUNCTION: acpi_ut_delete_mutex
178 *
179 * PARAMETERS: mutex_iD - ID of the mutex to be deleted
180 *
181 * RETURN: Status
182 *
183 * DESCRIPTION: Delete a mutex object.
184 *
185 ******************************************************************************/
186
187static void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
188{
189
190 ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id);
191
192 acpi_os_delete_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
193
194 acpi_gbl_mutex_info[mutex_id].mutex = NULL;
195 acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
196}
197
198/*******************************************************************************
199 *
200 * FUNCTION: acpi_ut_acquire_mutex
201 *
202 * PARAMETERS: mutex_iD - ID of the mutex to be acquired
203 *
204 * RETURN: Status
205 *
206 * DESCRIPTION: Acquire a mutex object.
207 *
208 ******************************************************************************/
209
210acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id)
211{
212 acpi_status status;
213 acpi_thread_id this_thread_id;
214
215 ACPI_FUNCTION_NAME(ut_acquire_mutex);
216
217 if (mutex_id > ACPI_MAX_MUTEX) {
218 return (AE_BAD_PARAMETER);
219 }
220
221 this_thread_id = acpi_os_get_thread_id();
222
223#ifdef ACPI_MUTEX_DEBUG
224 {
225 u32 i;
226 /*
227 * Mutex debug code, for internal debugging only.
228 *
229 * Deadlock prevention. Check if this thread owns any mutexes of value
230 * greater than or equal to this one. If so, the thread has violated
231 * the mutex ordering rule. This indicates a coding error somewhere in
232 * the ACPI subsystem code.
233 */
234 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
235 if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) {
236 if (i == mutex_id) {
237 ACPI_ERROR((AE_INFO,
238 "Mutex [%s] already acquired by this thread [%u]",
239 acpi_ut_get_mutex_name
240 (mutex_id),
241 (u32)this_thread_id));
242
243 return (AE_ALREADY_ACQUIRED);
244 }
245
246 ACPI_ERROR((AE_INFO,
247 "Invalid acquire order: Thread %u owns [%s], wants [%s]",
248 (u32)this_thread_id,
249 acpi_ut_get_mutex_name(i),
250 acpi_ut_get_mutex_name(mutex_id)));
251
252 return (AE_ACQUIRE_DEADLOCK);
253 }
254 }
255 }
256#endif
257
258 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
259 "Thread %u attempting to acquire Mutex [%s]\n",
260 (u32)this_thread_id,
261 acpi_ut_get_mutex_name(mutex_id)));
262
263 status = acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex,
264 ACPI_WAIT_FOREVER);
265 if (ACPI_SUCCESS(status)) {
266 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
267 "Thread %u acquired Mutex [%s]\n",
268 (u32)this_thread_id,
269 acpi_ut_get_mutex_name(mutex_id)));
270
271 acpi_gbl_mutex_info[mutex_id].use_count++;
272 acpi_gbl_mutex_info[mutex_id].thread_id = this_thread_id;
273 } else {
274 ACPI_EXCEPTION((AE_INFO, status,
275 "Thread %u could not acquire Mutex [0x%X]",
276 (u32)this_thread_id, mutex_id));
277 }
278
279 return (status);
280}
281
282/*******************************************************************************
283 *
284 * FUNCTION: acpi_ut_release_mutex
285 *
286 * PARAMETERS: mutex_iD - ID of the mutex to be released
287 *
288 * RETURN: Status
289 *
290 * DESCRIPTION: Release a mutex object.
291 *
292 ******************************************************************************/
293
294acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
295{
296 ACPI_FUNCTION_NAME(ut_release_mutex);
297
298 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
299 (u32)acpi_os_get_thread_id(),
300 acpi_ut_get_mutex_name(mutex_id)));
301
302 if (mutex_id > ACPI_MAX_MUTEX) {
303 return (AE_BAD_PARAMETER);
304 }
305
306 /*
307 * Mutex must be acquired in order to release it!
308 */
309 if (acpi_gbl_mutex_info[mutex_id].thread_id == ACPI_MUTEX_NOT_ACQUIRED) {
310 ACPI_ERROR((AE_INFO,
311 "Mutex [0x%X] is not acquired, cannot release",
312 mutex_id));
313
314 return (AE_NOT_ACQUIRED);
315 }
316#ifdef ACPI_MUTEX_DEBUG
317 {
318 u32 i;
319 /*
320 * Mutex debug code, for internal debugging only.
321 *
322 * Deadlock prevention. Check if this thread owns any mutexes of value
323 * greater than this one. If so, the thread has violated the mutex
324 * ordering rule. This indicates a coding error somewhere in
325 * the ACPI subsystem code.
326 */
327 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
328 if (acpi_gbl_mutex_info[i].thread_id ==
329 acpi_os_get_thread_id()) {
330 if (i == mutex_id) {
331 continue;
332 }
333
334 ACPI_ERROR((AE_INFO,
335 "Invalid release order: owns [%s], releasing [%s]",
336 acpi_ut_get_mutex_name(i),
337 acpi_ut_get_mutex_name(mutex_id)));
338
339 return (AE_RELEASE_DEADLOCK);
340 }
341 }
342 }
343#endif
344
345 /* Mark unlocked FIRST */
346
347 acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
348
349 acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
350 return (AE_OK);
351}
1/*******************************************************************************
2 *
3 * Module Name: utmutex - local mutex support
4 *
5 ******************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2014, 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
47#define _COMPONENT ACPI_UTILITIES
48ACPI_MODULE_NAME("utmutex")
49
50/* Local prototypes */
51static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id);
52
53static void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id);
54
55/*******************************************************************************
56 *
57 * FUNCTION: acpi_ut_mutex_initialize
58 *
59 * PARAMETERS: None.
60 *
61 * RETURN: Status
62 *
63 * DESCRIPTION: Create the system mutex objects. This includes mutexes,
64 * spin locks, and reader/writer locks.
65 *
66 ******************************************************************************/
67
68acpi_status acpi_ut_mutex_initialize(void)
69{
70 u32 i;
71 acpi_status status;
72
73 ACPI_FUNCTION_TRACE(ut_mutex_initialize);
74
75 /* Create each of the predefined mutex objects */
76
77 for (i = 0; i < ACPI_NUM_MUTEX; i++) {
78 status = acpi_ut_create_mutex(i);
79 if (ACPI_FAILURE(status)) {
80 return_ACPI_STATUS(status);
81 }
82 }
83
84 /* Create the spinlocks for use at interrupt level or for speed */
85
86 status = acpi_os_create_lock (&acpi_gbl_gpe_lock);
87 if (ACPI_FAILURE (status)) {
88 return_ACPI_STATUS (status);
89 }
90
91 status = acpi_os_create_lock (&acpi_gbl_hardware_lock);
92 if (ACPI_FAILURE (status)) {
93 return_ACPI_STATUS (status);
94 }
95
96 status = acpi_os_create_lock(&acpi_gbl_reference_count_lock);
97 if (ACPI_FAILURE(status)) {
98 return_ACPI_STATUS(status);
99 }
100
101 /* Mutex for _OSI support */
102
103 status = acpi_os_create_mutex(&acpi_gbl_osi_mutex);
104 if (ACPI_FAILURE(status)) {
105 return_ACPI_STATUS(status);
106 }
107
108 /* Create the reader/writer lock for namespace access */
109
110 status = acpi_ut_create_rw_lock(&acpi_gbl_namespace_rw_lock);
111 return_ACPI_STATUS(status);
112}
113
114/*******************************************************************************
115 *
116 * FUNCTION: acpi_ut_mutex_terminate
117 *
118 * PARAMETERS: None.
119 *
120 * RETURN: None.
121 *
122 * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
123 * spin locks, and reader/writer locks.
124 *
125 ******************************************************************************/
126
127void acpi_ut_mutex_terminate(void)
128{
129 u32 i;
130
131 ACPI_FUNCTION_TRACE(ut_mutex_terminate);
132
133 /* Delete each predefined mutex object */
134
135 for (i = 0; i < ACPI_NUM_MUTEX; i++) {
136 acpi_ut_delete_mutex(i);
137 }
138
139 acpi_os_delete_mutex(acpi_gbl_osi_mutex);
140
141 /* Delete the spinlocks */
142
143 acpi_os_delete_lock(acpi_gbl_gpe_lock);
144 acpi_os_delete_lock(acpi_gbl_hardware_lock);
145 acpi_os_delete_lock(acpi_gbl_reference_count_lock);
146
147 /* Delete the reader/writer lock */
148
149 acpi_ut_delete_rw_lock(&acpi_gbl_namespace_rw_lock);
150 return_VOID;
151}
152
153/*******************************************************************************
154 *
155 * FUNCTION: acpi_ut_create_mutex
156 *
157 * PARAMETERS: mutex_ID - ID of the mutex to be created
158 *
159 * RETURN: Status
160 *
161 * DESCRIPTION: Create a mutex object.
162 *
163 ******************************************************************************/
164
165static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id)
166{
167 acpi_status status = AE_OK;
168
169 ACPI_FUNCTION_TRACE_U32(ut_create_mutex, mutex_id);
170
171 if (!acpi_gbl_mutex_info[mutex_id].mutex) {
172 status =
173 acpi_os_create_mutex(&acpi_gbl_mutex_info[mutex_id].mutex);
174 acpi_gbl_mutex_info[mutex_id].thread_id =
175 ACPI_MUTEX_NOT_ACQUIRED;
176 acpi_gbl_mutex_info[mutex_id].use_count = 0;
177 }
178
179 return_ACPI_STATUS(status);
180}
181
182/*******************************************************************************
183 *
184 * FUNCTION: acpi_ut_delete_mutex
185 *
186 * PARAMETERS: mutex_ID - ID of the mutex to be deleted
187 *
188 * RETURN: Status
189 *
190 * DESCRIPTION: Delete a mutex object.
191 *
192 ******************************************************************************/
193
194static void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
195{
196
197 ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id);
198
199 acpi_os_delete_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
200
201 acpi_gbl_mutex_info[mutex_id].mutex = NULL;
202 acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
203
204 return_VOID;
205}
206
207/*******************************************************************************
208 *
209 * FUNCTION: acpi_ut_acquire_mutex
210 *
211 * PARAMETERS: mutex_ID - ID of the mutex to be acquired
212 *
213 * RETURN: Status
214 *
215 * DESCRIPTION: Acquire a mutex object.
216 *
217 ******************************************************************************/
218
219acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id)
220{
221 acpi_status status;
222 acpi_thread_id this_thread_id;
223
224 ACPI_FUNCTION_NAME(ut_acquire_mutex);
225
226 if (mutex_id > ACPI_MAX_MUTEX) {
227 return (AE_BAD_PARAMETER);
228 }
229
230 this_thread_id = acpi_os_get_thread_id();
231
232#ifdef ACPI_MUTEX_DEBUG
233 {
234 u32 i;
235 /*
236 * Mutex debug code, for internal debugging only.
237 *
238 * Deadlock prevention. Check if this thread owns any mutexes of value
239 * greater than or equal to this one. If so, the thread has violated
240 * the mutex ordering rule. This indicates a coding error somewhere in
241 * the ACPI subsystem code.
242 */
243 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
244 if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) {
245 if (i == mutex_id) {
246 ACPI_ERROR((AE_INFO,
247 "Mutex [%s] already acquired by this thread [%u]",
248 acpi_ut_get_mutex_name
249 (mutex_id),
250 (u32)this_thread_id));
251
252 return (AE_ALREADY_ACQUIRED);
253 }
254
255 ACPI_ERROR((AE_INFO,
256 "Invalid acquire order: Thread %u owns [%s], wants [%s]",
257 (u32)this_thread_id,
258 acpi_ut_get_mutex_name(i),
259 acpi_ut_get_mutex_name(mutex_id)));
260
261 return (AE_ACQUIRE_DEADLOCK);
262 }
263 }
264 }
265#endif
266
267 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
268 "Thread %u attempting to acquire Mutex [%s]\n",
269 (u32)this_thread_id,
270 acpi_ut_get_mutex_name(mutex_id)));
271
272 status = acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex,
273 ACPI_WAIT_FOREVER);
274 if (ACPI_SUCCESS(status)) {
275 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
276 "Thread %u acquired Mutex [%s]\n",
277 (u32)this_thread_id,
278 acpi_ut_get_mutex_name(mutex_id)));
279
280 acpi_gbl_mutex_info[mutex_id].use_count++;
281 acpi_gbl_mutex_info[mutex_id].thread_id = this_thread_id;
282 } else {
283 ACPI_EXCEPTION((AE_INFO, status,
284 "Thread %u could not acquire Mutex [0x%X]",
285 (u32)this_thread_id, mutex_id));
286 }
287
288 return (status);
289}
290
291/*******************************************************************************
292 *
293 * FUNCTION: acpi_ut_release_mutex
294 *
295 * PARAMETERS: mutex_ID - ID of the mutex to be released
296 *
297 * RETURN: Status
298 *
299 * DESCRIPTION: Release a mutex object.
300 *
301 ******************************************************************************/
302
303acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
304{
305 ACPI_FUNCTION_NAME(ut_release_mutex);
306
307 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
308 (u32)acpi_os_get_thread_id(),
309 acpi_ut_get_mutex_name(mutex_id)));
310
311 if (mutex_id > ACPI_MAX_MUTEX) {
312 return (AE_BAD_PARAMETER);
313 }
314
315 /*
316 * Mutex must be acquired in order to release it!
317 */
318 if (acpi_gbl_mutex_info[mutex_id].thread_id == ACPI_MUTEX_NOT_ACQUIRED) {
319 ACPI_ERROR((AE_INFO,
320 "Mutex [0x%X] is not acquired, cannot release",
321 mutex_id));
322
323 return (AE_NOT_ACQUIRED);
324 }
325#ifdef ACPI_MUTEX_DEBUG
326 {
327 u32 i;
328 /*
329 * Mutex debug code, for internal debugging only.
330 *
331 * Deadlock prevention. Check if this thread owns any mutexes of value
332 * greater than this one. If so, the thread has violated the mutex
333 * ordering rule. This indicates a coding error somewhere in
334 * the ACPI subsystem code.
335 */
336 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
337 if (acpi_gbl_mutex_info[i].thread_id ==
338 acpi_os_get_thread_id()) {
339 if (i == mutex_id) {
340 continue;
341 }
342
343 ACPI_ERROR((AE_INFO,
344 "Invalid release order: owns [%s], releasing [%s]",
345 acpi_ut_get_mutex_name(i),
346 acpi_ut_get_mutex_name(mutex_id)));
347
348 return (AE_RELEASE_DEADLOCK);
349 }
350 }
351 }
352#endif
353
354 /* Mark unlocked FIRST */
355
356 acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
357
358 acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
359 return (AE_OK);
360}