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1/*******************************************************************************
2 *
3 * Module Name: utmutex - local mutex support
4 *
5 ******************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2011, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44#include <acpi/acpi.h>
45#include "accommon.h"
46
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_thread_id this_thread_id;
297
298 ACPI_FUNCTION_NAME(ut_release_mutex);
299
300 this_thread_id = acpi_os_get_thread_id();
301
302 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
303 (u32)this_thread_id,
304 acpi_ut_get_mutex_name(mutex_id)));
305
306 if (mutex_id > ACPI_MAX_MUTEX) {
307 return (AE_BAD_PARAMETER);
308 }
309
310 /*
311 * Mutex must be acquired in order to release it!
312 */
313 if (acpi_gbl_mutex_info[mutex_id].thread_id == ACPI_MUTEX_NOT_ACQUIRED) {
314 ACPI_ERROR((AE_INFO,
315 "Mutex [0x%X] is not acquired, cannot release",
316 mutex_id));
317
318 return (AE_NOT_ACQUIRED);
319 }
320#ifdef ACPI_MUTEX_DEBUG
321 {
322 u32 i;
323 /*
324 * Mutex debug code, for internal debugging only.
325 *
326 * Deadlock prevention. Check if this thread owns any mutexes of value
327 * greater than this one. If so, the thread has violated the mutex
328 * ordering rule. This indicates a coding error somewhere in
329 * the ACPI subsystem code.
330 */
331 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
332 if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) {
333 if (i == mutex_id) {
334 continue;
335 }
336
337 ACPI_ERROR((AE_INFO,
338 "Invalid release order: owns [%s], releasing [%s]",
339 acpi_ut_get_mutex_name(i),
340 acpi_ut_get_mutex_name(mutex_id)));
341
342 return (AE_RELEASE_DEADLOCK);
343 }
344 }
345 }
346#endif
347
348 /* Mark unlocked FIRST */
349
350 acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
351
352 acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
353 return (AE_OK);
354}
1/*******************************************************************************
2 *
3 * Module Name: utmutex - local mutex support
4 *
5 ******************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2016, 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 if (ACPI_FAILURE(status)) {
112 return_ACPI_STATUS(status);
113 }
114
115 return_ACPI_STATUS(status);
116}
117
118/*******************************************************************************
119 *
120 * FUNCTION: acpi_ut_mutex_terminate
121 *
122 * PARAMETERS: None.
123 *
124 * RETURN: None.
125 *
126 * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
127 * spin locks, and reader/writer locks.
128 *
129 ******************************************************************************/
130
131void acpi_ut_mutex_terminate(void)
132{
133 u32 i;
134
135 ACPI_FUNCTION_TRACE(ut_mutex_terminate);
136
137 /* Delete each predefined mutex object */
138
139 for (i = 0; i < ACPI_NUM_MUTEX; i++) {
140 acpi_ut_delete_mutex(i);
141 }
142
143 acpi_os_delete_mutex(acpi_gbl_osi_mutex);
144
145 /* Delete the spinlocks */
146
147 acpi_os_delete_lock(acpi_gbl_gpe_lock);
148 acpi_os_delete_lock(acpi_gbl_hardware_lock);
149 acpi_os_delete_lock(acpi_gbl_reference_count_lock);
150
151 /* Delete the reader/writer lock */
152
153 acpi_ut_delete_rw_lock(&acpi_gbl_namespace_rw_lock);
154 return_VOID;
155}
156
157/*******************************************************************************
158 *
159 * FUNCTION: acpi_ut_create_mutex
160 *
161 * PARAMETERS: mutex_ID - ID of the mutex to be created
162 *
163 * RETURN: Status
164 *
165 * DESCRIPTION: Create a mutex object.
166 *
167 ******************************************************************************/
168
169static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id)
170{
171 acpi_status status = AE_OK;
172
173 ACPI_FUNCTION_TRACE_U32(ut_create_mutex, mutex_id);
174
175 if (!acpi_gbl_mutex_info[mutex_id].mutex) {
176 status =
177 acpi_os_create_mutex(&acpi_gbl_mutex_info[mutex_id].mutex);
178 acpi_gbl_mutex_info[mutex_id].thread_id =
179 ACPI_MUTEX_NOT_ACQUIRED;
180 acpi_gbl_mutex_info[mutex_id].use_count = 0;
181 }
182
183 return_ACPI_STATUS(status);
184}
185
186/*******************************************************************************
187 *
188 * FUNCTION: acpi_ut_delete_mutex
189 *
190 * PARAMETERS: mutex_ID - ID of the mutex to be deleted
191 *
192 * RETURN: Status
193 *
194 * DESCRIPTION: Delete a mutex object.
195 *
196 ******************************************************************************/
197
198static void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
199{
200
201 ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id);
202
203 acpi_os_delete_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
204
205 acpi_gbl_mutex_info[mutex_id].mutex = NULL;
206 acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
207
208 return_VOID;
209}
210
211/*******************************************************************************
212 *
213 * FUNCTION: acpi_ut_acquire_mutex
214 *
215 * PARAMETERS: mutex_ID - ID of the mutex to be acquired
216 *
217 * RETURN: Status
218 *
219 * DESCRIPTION: Acquire a mutex object.
220 *
221 ******************************************************************************/
222
223acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id)
224{
225 acpi_status status;
226 acpi_thread_id this_thread_id;
227
228 ACPI_FUNCTION_NAME(ut_acquire_mutex);
229
230 if (mutex_id > ACPI_MAX_MUTEX) {
231 return (AE_BAD_PARAMETER);
232 }
233
234 this_thread_id = acpi_os_get_thread_id();
235
236#ifdef ACPI_MUTEX_DEBUG
237 {
238 u32 i;
239 /*
240 * Mutex debug code, for internal debugging only.
241 *
242 * Deadlock prevention. Check if this thread owns any mutexes of value
243 * greater than or equal to this one. If so, the thread has violated
244 * the mutex ordering rule. This indicates a coding error somewhere in
245 * the ACPI subsystem code.
246 */
247 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
248 if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) {
249 if (i == mutex_id) {
250 ACPI_ERROR((AE_INFO,
251 "Mutex [%s] already acquired by this thread [%u]",
252 acpi_ut_get_mutex_name
253 (mutex_id),
254 (u32)this_thread_id));
255
256 return (AE_ALREADY_ACQUIRED);
257 }
258
259 ACPI_ERROR((AE_INFO,
260 "Invalid acquire order: Thread %u owns [%s], wants [%s]",
261 (u32)this_thread_id,
262 acpi_ut_get_mutex_name(i),
263 acpi_ut_get_mutex_name(mutex_id)));
264
265 return (AE_ACQUIRE_DEADLOCK);
266 }
267 }
268 }
269#endif
270
271 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
272 "Thread %u attempting to acquire Mutex [%s]\n",
273 (u32)this_thread_id,
274 acpi_ut_get_mutex_name(mutex_id)));
275
276 status =
277 acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex,
278 ACPI_WAIT_FOREVER);
279 if (ACPI_SUCCESS(status)) {
280 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
281 "Thread %u acquired Mutex [%s]\n",
282 (u32)this_thread_id,
283 acpi_ut_get_mutex_name(mutex_id)));
284
285 acpi_gbl_mutex_info[mutex_id].use_count++;
286 acpi_gbl_mutex_info[mutex_id].thread_id = this_thread_id;
287 } else {
288 ACPI_EXCEPTION((AE_INFO, status,
289 "Thread %u could not acquire Mutex [0x%X]",
290 (u32)this_thread_id, mutex_id));
291 }
292
293 return (status);
294}
295
296/*******************************************************************************
297 *
298 * FUNCTION: acpi_ut_release_mutex
299 *
300 * PARAMETERS: mutex_ID - ID of the mutex to be released
301 *
302 * RETURN: Status
303 *
304 * DESCRIPTION: Release a mutex object.
305 *
306 ******************************************************************************/
307
308acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
309{
310 ACPI_FUNCTION_NAME(ut_release_mutex);
311
312 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
313 (u32)acpi_os_get_thread_id(),
314 acpi_ut_get_mutex_name(mutex_id)));
315
316 if (mutex_id > ACPI_MAX_MUTEX) {
317 return (AE_BAD_PARAMETER);
318 }
319
320 /*
321 * Mutex must be acquired in order to release it!
322 */
323 if (acpi_gbl_mutex_info[mutex_id].thread_id == ACPI_MUTEX_NOT_ACQUIRED) {
324 ACPI_ERROR((AE_INFO,
325 "Mutex [0x%X] is not acquired, cannot release",
326 mutex_id));
327
328 return (AE_NOT_ACQUIRED);
329 }
330#ifdef ACPI_MUTEX_DEBUG
331 {
332 u32 i;
333 /*
334 * Mutex debug code, for internal debugging only.
335 *
336 * Deadlock prevention. Check if this thread owns any mutexes of value
337 * greater than this one. If so, the thread has violated the mutex
338 * ordering rule. This indicates a coding error somewhere in
339 * the ACPI subsystem code.
340 */
341 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
342 if (acpi_gbl_mutex_info[i].thread_id ==
343 acpi_os_get_thread_id()) {
344 if (i == mutex_id) {
345 continue;
346 }
347
348 ACPI_ERROR((AE_INFO,
349 "Invalid release order: owns [%s], releasing [%s]",
350 acpi_ut_get_mutex_name(i),
351 acpi_ut_get_mutex_name(mutex_id)));
352
353 return (AE_RELEASE_DEADLOCK);
354 }
355 }
356 }
357#endif
358
359 /* Mark unlocked FIRST */
360
361 acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
362
363 acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
364 return (AE_OK);
365}