Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * |
| 3 | * Module Name: utmutex - local mutex support |
| 4 | * |
| 5 | ******************************************************************************/ |
| 6 | |
| 7 | /* |
Bob Moore | 4a90c7e | 2006-01-13 16:22:00 -0500 | [diff] [blame] | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 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 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 44 | #include <acpi/acpi.h> |
| 45 | |
| 46 | #define _COMPONENT ACPI_UTILITIES |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 47 | ACPI_MODULE_NAME("utmutex") |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 48 | |
| 49 | /* Local prototypes */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 50 | static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 51 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 52 | static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 53 | |
| 54 | /******************************************************************************* |
| 55 | * |
| 56 | * FUNCTION: acpi_ut_mutex_initialize |
| 57 | * |
| 58 | * PARAMETERS: None. |
| 59 | * |
| 60 | * RETURN: Status |
| 61 | * |
| 62 | * DESCRIPTION: Create the system mutex objects. |
| 63 | * |
| 64 | ******************************************************************************/ |
| 65 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 66 | acpi_status acpi_ut_mutex_initialize(void) |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 67 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 68 | u32 i; |
| 69 | acpi_status status; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 70 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 71 | ACPI_FUNCTION_TRACE(ut_mutex_initialize); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 72 | |
| 73 | /* |
| 74 | * Create each of the predefined mutex objects |
| 75 | */ |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 76 | for (i = 0; i < ACPI_NUM_MUTEX; i++) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 77 | status = acpi_ut_create_mutex(i); |
| 78 | if (ACPI_FAILURE(status)) { |
| 79 | return_ACPI_STATUS(status); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 80 | } |
| 81 | } |
| 82 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 83 | /* Create the spinlocks for use at interrupt level */ |
| 84 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 85 | status = acpi_os_create_lock(&acpi_gbl_gpe_lock); |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 86 | if (ACPI_FAILURE(status)) { |
| 87 | return_ACPI_STATUS(status); |
| 88 | } |
| 89 | |
| 90 | status = acpi_os_create_lock(&acpi_gbl_hardware_lock); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 91 | return_ACPI_STATUS(status); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 92 | } |
| 93 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 94 | /******************************************************************************* |
| 95 | * |
| 96 | * FUNCTION: acpi_ut_mutex_terminate |
| 97 | * |
| 98 | * PARAMETERS: None. |
| 99 | * |
| 100 | * RETURN: None. |
| 101 | * |
| 102 | * DESCRIPTION: Delete all of the system mutex objects. |
| 103 | * |
| 104 | ******************************************************************************/ |
| 105 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 106 | void acpi_ut_mutex_terminate(void) |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 107 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 108 | u32 i; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 109 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 110 | ACPI_FUNCTION_TRACE(ut_mutex_terminate); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 111 | |
| 112 | /* |
| 113 | * Delete each predefined mutex object |
| 114 | */ |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 115 | for (i = 0; i < ACPI_NUM_MUTEX; i++) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 116 | (void)acpi_ut_delete_mutex(i); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 117 | } |
| 118 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 119 | /* Delete the spinlocks */ |
| 120 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 121 | acpi_os_delete_lock(acpi_gbl_gpe_lock); |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 122 | acpi_os_delete_lock(acpi_gbl_hardware_lock); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 123 | return_VOID; |
| 124 | } |
| 125 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 126 | /******************************************************************************* |
| 127 | * |
| 128 | * FUNCTION: acpi_ut_create_mutex |
| 129 | * |
| 130 | * PARAMETERS: mutex_iD - ID of the mutex to be created |
| 131 | * |
| 132 | * RETURN: Status |
| 133 | * |
| 134 | * DESCRIPTION: Create a mutex object. |
| 135 | * |
| 136 | ******************************************************************************/ |
| 137 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 138 | static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id) |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 139 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 140 | acpi_status status = AE_OK; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 141 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 142 | ACPI_FUNCTION_TRACE_U32(ut_create_mutex, mutex_id); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 143 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 144 | if (mutex_id > ACPI_MAX_MUTEX) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 145 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 146 | } |
| 147 | |
| 148 | if (!acpi_gbl_mutex_info[mutex_id].mutex) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 149 | status = acpi_os_create_semaphore(1, 1, |
| 150 | &acpi_gbl_mutex_info |
| 151 | [mutex_id].mutex); |
| 152 | acpi_gbl_mutex_info[mutex_id].thread_id = |
| 153 | ACPI_MUTEX_NOT_ACQUIRED; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 154 | acpi_gbl_mutex_info[mutex_id].use_count = 0; |
| 155 | } |
| 156 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 157 | return_ACPI_STATUS(status); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 158 | } |
| 159 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 160 | /******************************************************************************* |
| 161 | * |
| 162 | * FUNCTION: acpi_ut_delete_mutex |
| 163 | * |
| 164 | * PARAMETERS: mutex_iD - ID of the mutex to be deleted |
| 165 | * |
| 166 | * RETURN: Status |
| 167 | * |
| 168 | * DESCRIPTION: Delete a mutex object. |
| 169 | * |
| 170 | ******************************************************************************/ |
| 171 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 172 | static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id) |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 173 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 174 | acpi_status status; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 175 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 176 | ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 177 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 178 | if (mutex_id > ACPI_MAX_MUTEX) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 179 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 180 | } |
| 181 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 182 | status = acpi_os_delete_semaphore(acpi_gbl_mutex_info[mutex_id].mutex); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 183 | |
| 184 | acpi_gbl_mutex_info[mutex_id].mutex = NULL; |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 185 | acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 186 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 187 | return_ACPI_STATUS(status); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 188 | } |
| 189 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 190 | /******************************************************************************* |
| 191 | * |
| 192 | * FUNCTION: acpi_ut_acquire_mutex |
| 193 | * |
| 194 | * PARAMETERS: mutex_iD - ID of the mutex to be acquired |
| 195 | * |
| 196 | * RETURN: Status |
| 197 | * |
| 198 | * DESCRIPTION: Acquire a mutex object. |
| 199 | * |
| 200 | ******************************************************************************/ |
| 201 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 202 | acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id) |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 203 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 204 | acpi_status status; |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 205 | acpi_thread_id this_thread_id; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 206 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 207 | ACPI_FUNCTION_NAME(ut_acquire_mutex); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 208 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 209 | if (mutex_id > ACPI_MAX_MUTEX) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 210 | return (AE_BAD_PARAMETER); |
| 211 | } |
| 212 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 213 | this_thread_id = acpi_os_get_thread_id(); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 214 | |
| 215 | #ifdef ACPI_MUTEX_DEBUG |
| 216 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 217 | u32 i; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 218 | /* |
| 219 | * Mutex debug code, for internal debugging only. |
| 220 | * |
| 221 | * Deadlock prevention. Check if this thread owns any mutexes of value |
| 222 | * greater than or equal to this one. If so, the thread has violated |
| 223 | * the mutex ordering rule. This indicates a coding error somewhere in |
| 224 | * the ACPI subsystem code. |
| 225 | */ |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 226 | for (i = mutex_id; i < ACPI_MAX_MUTEX; i++) { |
Robert Moore | bda663d | 2005-09-16 16:51:15 -0400 | [diff] [blame] | 227 | if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 228 | if (i == mutex_id) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 229 | ACPI_ERROR((AE_INFO, |
| 230 | "Mutex [%s] already acquired by this thread [%X]", |
| 231 | acpi_ut_get_mutex_name |
| 232 | (mutex_id), |
| 233 | this_thread_id)); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 234 | |
| 235 | return (AE_ALREADY_ACQUIRED); |
| 236 | } |
| 237 | |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 238 | ACPI_ERROR((AE_INFO, |
| 239 | "Invalid acquire order: Thread %X owns [%s], wants [%s]", |
| 240 | this_thread_id, |
| 241 | acpi_ut_get_mutex_name(i), |
| 242 | acpi_ut_get_mutex_name(mutex_id))); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 243 | |
| 244 | return (AE_ACQUIRE_DEADLOCK); |
| 245 | } |
| 246 | } |
| 247 | } |
| 248 | #endif |
| 249 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 250 | ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, |
| 251 | "Thread %X attempting to acquire Mutex [%s]\n", |
| 252 | this_thread_id, acpi_ut_get_mutex_name(mutex_id))); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 253 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 254 | status = acpi_os_wait_semaphore(acpi_gbl_mutex_info[mutex_id].mutex, |
| 255 | 1, ACPI_WAIT_FOREVER); |
| 256 | if (ACPI_SUCCESS(status)) { |
| 257 | ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, |
| 258 | "Thread %X acquired Mutex [%s]\n", |
| 259 | this_thread_id, |
| 260 | acpi_ut_get_mutex_name(mutex_id))); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 261 | |
| 262 | acpi_gbl_mutex_info[mutex_id].use_count++; |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 263 | acpi_gbl_mutex_info[mutex_id].thread_id = this_thread_id; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 264 | } else { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 265 | ACPI_EXCEPTION((AE_INFO, status, |
| 266 | "Thread %X could not acquire Mutex [%X]", |
| 267 | this_thread_id, mutex_id)); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 268 | } |
| 269 | |
| 270 | return (status); |
| 271 | } |
| 272 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 273 | /******************************************************************************* |
| 274 | * |
| 275 | * FUNCTION: acpi_ut_release_mutex |
| 276 | * |
| 277 | * PARAMETERS: mutex_iD - ID of the mutex to be released |
| 278 | * |
| 279 | * RETURN: Status |
| 280 | * |
| 281 | * DESCRIPTION: Release a mutex object. |
| 282 | * |
| 283 | ******************************************************************************/ |
| 284 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 285 | acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id) |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 286 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 287 | acpi_status status; |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 288 | acpi_thread_id this_thread_id; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 289 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 290 | ACPI_FUNCTION_NAME(ut_release_mutex); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 291 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 292 | this_thread_id = acpi_os_get_thread_id(); |
| 293 | ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, |
| 294 | "Thread %X releasing Mutex [%s]\n", this_thread_id, |
| 295 | acpi_ut_get_mutex_name(mutex_id))); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 296 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 297 | if (mutex_id > ACPI_MAX_MUTEX) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 298 | return (AE_BAD_PARAMETER); |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * Mutex must be acquired in order to release it! |
| 303 | */ |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 304 | if (acpi_gbl_mutex_info[mutex_id].thread_id == ACPI_MUTEX_NOT_ACQUIRED) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 305 | ACPI_ERROR((AE_INFO, |
| 306 | "Mutex [%X] is not acquired, cannot release", |
| 307 | mutex_id)); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 308 | |
| 309 | return (AE_NOT_ACQUIRED); |
| 310 | } |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 311 | #ifdef ACPI_MUTEX_DEBUG |
| 312 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 313 | u32 i; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 314 | /* |
| 315 | * Mutex debug code, for internal debugging only. |
| 316 | * |
| 317 | * Deadlock prevention. Check if this thread owns any mutexes of value |
| 318 | * greater than this one. If so, the thread has violated the mutex |
| 319 | * ordering rule. This indicates a coding error somewhere in |
| 320 | * the ACPI subsystem code. |
| 321 | */ |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 322 | for (i = mutex_id; i < ACPI_MAX_MUTEX; i++) { |
Robert Moore | bda663d | 2005-09-16 16:51:15 -0400 | [diff] [blame] | 323 | if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 324 | if (i == mutex_id) { |
| 325 | continue; |
| 326 | } |
| 327 | |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 328 | ACPI_ERROR((AE_INFO, |
| 329 | "Invalid release order: owns [%s], releasing [%s]", |
| 330 | acpi_ut_get_mutex_name(i), |
| 331 | acpi_ut_get_mutex_name(mutex_id))); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 332 | |
| 333 | return (AE_RELEASE_DEADLOCK); |
| 334 | } |
| 335 | } |
| 336 | } |
| 337 | #endif |
| 338 | |
| 339 | /* Mark unlocked FIRST */ |
| 340 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 341 | acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 342 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 343 | status = |
| 344 | acpi_os_signal_semaphore(acpi_gbl_mutex_info[mutex_id].mutex, 1); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 345 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 346 | if (ACPI_FAILURE(status)) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 347 | ACPI_EXCEPTION((AE_INFO, status, |
| 348 | "Thread %X could not release Mutex [%X]", |
| 349 | this_thread_id, mutex_id)); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 350 | } else { |
| 351 | ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, |
| 352 | "Thread %X released Mutex [%s]\n", |
| 353 | this_thread_id, |
| 354 | acpi_ut_get_mutex_name(mutex_id))); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | return (status); |
| 358 | } |