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 | /* |
Len Brown | 75a44ce | 2008-04-23 23:00:13 -0400 | [diff] [blame] | 8 | * Copyright (C) 2000 - 2008, Intel Corp. |
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> |
Len Brown | e2f7a77 | 2009-01-09 00:30:03 -0500 | [diff] [blame] | 45 | #include "accommon.h" |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 46 | |
| 47 | #define _COMPONENT ACPI_UTILITIES |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 48 | ACPI_MODULE_NAME("utmutex") |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 49 | |
| 50 | /* Local prototypes */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 51 | static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 52 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 53 | static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 54 | |
| 55 | /******************************************************************************* |
| 56 | * |
| 57 | * FUNCTION: acpi_ut_mutex_initialize |
| 58 | * |
| 59 | * PARAMETERS: None. |
| 60 | * |
| 61 | * RETURN: Status |
| 62 | * |
Bob Moore | 8a335a23 | 2009-03-09 16:31:04 +0800 | [diff] [blame] | 63 | * DESCRIPTION: Create the system mutex objects. This includes mutexes, |
| 64 | * spin locks, and reader/writer locks. |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 65 | * |
| 66 | ******************************************************************************/ |
| 67 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 68 | acpi_status acpi_ut_mutex_initialize(void) |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 69 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 70 | u32 i; |
| 71 | acpi_status status; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 72 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 73 | ACPI_FUNCTION_TRACE(ut_mutex_initialize); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 74 | |
Bob Moore | 8a335a23 | 2009-03-09 16:31:04 +0800 | [diff] [blame] | 75 | /* Create each of the predefined mutex objects */ |
| 76 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 77 | for (i = 0; i < ACPI_NUM_MUTEX; i++) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 78 | status = acpi_ut_create_mutex(i); |
| 79 | if (ACPI_FAILURE(status)) { |
| 80 | return_ACPI_STATUS(status); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 81 | } |
| 82 | } |
| 83 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 84 | /* Create the spinlocks for use at interrupt level */ |
| 85 | |
Bob Moore | 967440e3 | 2006-06-23 17:04:00 -0400 | [diff] [blame] | 86 | spin_lock_init(acpi_gbl_gpe_lock); |
| 87 | spin_lock_init(acpi_gbl_hardware_lock); |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 88 | |
Bob Moore | 8a335a23 | 2009-03-09 16:31:04 +0800 | [diff] [blame] | 89 | /* Create the reader/writer lock for namespace access */ |
| 90 | |
| 91 | status = acpi_ut_create_rw_lock(&acpi_gbl_namespace_rw_lock); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 92 | return_ACPI_STATUS(status); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 93 | } |
| 94 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 95 | /******************************************************************************* |
| 96 | * |
| 97 | * FUNCTION: acpi_ut_mutex_terminate |
| 98 | * |
| 99 | * PARAMETERS: None. |
| 100 | * |
| 101 | * RETURN: None. |
| 102 | * |
Bob Moore | 8a335a23 | 2009-03-09 16:31:04 +0800 | [diff] [blame] | 103 | * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes, |
| 104 | * spin locks, and reader/writer locks. |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 105 | * |
| 106 | ******************************************************************************/ |
| 107 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 108 | void acpi_ut_mutex_terminate(void) |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 109 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 110 | u32 i; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 111 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 112 | ACPI_FUNCTION_TRACE(ut_mutex_terminate); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 113 | |
Bob Moore | 8a335a23 | 2009-03-09 16:31:04 +0800 | [diff] [blame] | 114 | /* Delete each predefined mutex object */ |
| 115 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 116 | for (i = 0; i < ACPI_NUM_MUTEX; i++) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 117 | (void)acpi_ut_delete_mutex(i); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 118 | } |
| 119 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 120 | /* Delete the spinlocks */ |
| 121 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 122 | acpi_os_delete_lock(acpi_gbl_gpe_lock); |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 123 | acpi_os_delete_lock(acpi_gbl_hardware_lock); |
Bob Moore | 8a335a23 | 2009-03-09 16:31:04 +0800 | [diff] [blame] | 124 | |
| 125 | /* Delete the reader/writer lock */ |
| 126 | |
| 127 | acpi_ut_delete_rw_lock(&acpi_gbl_namespace_rw_lock); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 128 | return_VOID; |
| 129 | } |
| 130 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 131 | /******************************************************************************* |
| 132 | * |
| 133 | * FUNCTION: acpi_ut_create_mutex |
| 134 | * |
| 135 | * PARAMETERS: mutex_iD - ID of the mutex to be created |
| 136 | * |
| 137 | * RETURN: Status |
| 138 | * |
| 139 | * DESCRIPTION: Create a mutex object. |
| 140 | * |
| 141 | ******************************************************************************/ |
| 142 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 143 | static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id) |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 144 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 145 | acpi_status status = AE_OK; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 146 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 147 | ACPI_FUNCTION_TRACE_U32(ut_create_mutex, mutex_id); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 148 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 149 | if (mutex_id > ACPI_MAX_MUTEX) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 150 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | if (!acpi_gbl_mutex_info[mutex_id].mutex) { |
Bob Moore | 967440e3 | 2006-06-23 17:04:00 -0400 | [diff] [blame] | 154 | status = |
| 155 | acpi_os_create_mutex(&acpi_gbl_mutex_info[mutex_id].mutex); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 156 | acpi_gbl_mutex_info[mutex_id].thread_id = |
| 157 | ACPI_MUTEX_NOT_ACQUIRED; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 158 | acpi_gbl_mutex_info[mutex_id].use_count = 0; |
| 159 | } |
| 160 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 161 | return_ACPI_STATUS(status); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 162 | } |
| 163 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 164 | /******************************************************************************* |
| 165 | * |
| 166 | * FUNCTION: acpi_ut_delete_mutex |
| 167 | * |
| 168 | * PARAMETERS: mutex_iD - ID of the mutex to be deleted |
| 169 | * |
| 170 | * RETURN: Status |
| 171 | * |
| 172 | * DESCRIPTION: Delete a mutex object. |
| 173 | * |
| 174 | ******************************************************************************/ |
| 175 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 176 | static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id) |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 177 | { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 178 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 179 | ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 180 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 181 | if (mutex_id > ACPI_MAX_MUTEX) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 182 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 183 | } |
| 184 | |
Bob Moore | 967440e3 | 2006-06-23 17:04:00 -0400 | [diff] [blame] | 185 | acpi_os_delete_mutex(acpi_gbl_mutex_info[mutex_id].mutex); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 186 | |
| 187 | acpi_gbl_mutex_info[mutex_id].mutex = NULL; |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 188 | acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 189 | |
Bob Moore | 967440e3 | 2006-06-23 17:04:00 -0400 | [diff] [blame] | 190 | return_ACPI_STATUS(AE_OK); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 191 | } |
| 192 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 193 | /******************************************************************************* |
| 194 | * |
| 195 | * FUNCTION: acpi_ut_acquire_mutex |
| 196 | * |
| 197 | * PARAMETERS: mutex_iD - ID of the mutex to be acquired |
| 198 | * |
| 199 | * RETURN: Status |
| 200 | * |
| 201 | * DESCRIPTION: Acquire a mutex object. |
| 202 | * |
| 203 | ******************************************************************************/ |
| 204 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 205 | acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id) |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 206 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 207 | acpi_status status; |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 208 | acpi_thread_id this_thread_id; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 209 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 210 | ACPI_FUNCTION_NAME(ut_acquire_mutex); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 211 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 212 | if (mutex_id > ACPI_MAX_MUTEX) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 213 | return (AE_BAD_PARAMETER); |
| 214 | } |
| 215 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 216 | this_thread_id = acpi_os_get_thread_id(); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 217 | |
| 218 | #ifdef ACPI_MUTEX_DEBUG |
| 219 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 220 | u32 i; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 221 | /* |
| 222 | * Mutex debug code, for internal debugging only. |
| 223 | * |
| 224 | * Deadlock prevention. Check if this thread owns any mutexes of value |
| 225 | * greater than or equal to this one. If so, the thread has violated |
| 226 | * the mutex ordering rule. This indicates a coding error somewhere in |
| 227 | * the ACPI subsystem code. |
| 228 | */ |
Bob Moore | b53ce3f | 2008-06-10 14:30:04 +0800 | [diff] [blame] | 229 | for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) { |
Robert Moore | bda663d | 2005-09-16 16:51:15 -0400 | [diff] [blame] | 230 | if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 231 | if (i == mutex_id) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 232 | ACPI_ERROR((AE_INFO, |
Bob Moore | 10b6575 | 2009-04-22 11:39:10 +0800 | [diff] [blame] | 233 | "Mutex [%s] already acquired by this thread [%p]", |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 234 | acpi_ut_get_mutex_name |
| 235 | (mutex_id), |
Bob Moore | 10b6575 | 2009-04-22 11:39:10 +0800 | [diff] [blame] | 236 | ACPI_CAST_PTR(void, |
| 237 | this_thread_id))); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 238 | |
| 239 | return (AE_ALREADY_ACQUIRED); |
| 240 | } |
| 241 | |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 242 | ACPI_ERROR((AE_INFO, |
Bob Moore | 10b6575 | 2009-04-22 11:39:10 +0800 | [diff] [blame] | 243 | "Invalid acquire order: Thread %p owns [%s], wants [%s]", |
| 244 | ACPI_CAST_PTR(void, this_thread_id), |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 245 | acpi_ut_get_mutex_name(i), |
| 246 | acpi_ut_get_mutex_name(mutex_id))); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 247 | |
| 248 | return (AE_ACQUIRE_DEADLOCK); |
| 249 | } |
| 250 | } |
| 251 | } |
| 252 | #endif |
| 253 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 254 | ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, |
Bob Moore | 10b6575 | 2009-04-22 11:39:10 +0800 | [diff] [blame] | 255 | "Thread %p attempting to acquire Mutex [%s]\n", |
| 256 | ACPI_CAST_PTR(void, this_thread_id), |
Martin Bligh | 965a3d4 | 2006-10-20 14:30:26 -0700 | [diff] [blame] | 257 | acpi_ut_get_mutex_name(mutex_id))); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 258 | |
Bob Moore | 967440e3 | 2006-06-23 17:04:00 -0400 | [diff] [blame] | 259 | status = acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex, |
| 260 | ACPI_WAIT_FOREVER); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 261 | if (ACPI_SUCCESS(status)) { |
| 262 | ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, |
Bob Moore | 10b6575 | 2009-04-22 11:39:10 +0800 | [diff] [blame] | 263 | "Thread %p acquired Mutex [%s]\n", |
| 264 | ACPI_CAST_PTR(void, this_thread_id), |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 265 | acpi_ut_get_mutex_name(mutex_id))); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 266 | |
| 267 | acpi_gbl_mutex_info[mutex_id].use_count++; |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 268 | acpi_gbl_mutex_info[mutex_id].thread_id = this_thread_id; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 269 | } else { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 270 | ACPI_EXCEPTION((AE_INFO, status, |
Bob Moore | 10b6575 | 2009-04-22 11:39:10 +0800 | [diff] [blame] | 271 | "Thread %p could not acquire Mutex [%X]", |
| 272 | ACPI_CAST_PTR(void, this_thread_id), mutex_id)); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 273 | } |
| 274 | |
| 275 | return (status); |
| 276 | } |
| 277 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 278 | /******************************************************************************* |
| 279 | * |
| 280 | * FUNCTION: acpi_ut_release_mutex |
| 281 | * |
| 282 | * PARAMETERS: mutex_iD - ID of the mutex to be released |
| 283 | * |
| 284 | * RETURN: Status |
| 285 | * |
| 286 | * DESCRIPTION: Release a mutex object. |
| 287 | * |
| 288 | ******************************************************************************/ |
| 289 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 290 | acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id) |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 291 | { |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 292 | acpi_thread_id this_thread_id; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 293 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 294 | ACPI_FUNCTION_NAME(ut_release_mutex); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 295 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 296 | this_thread_id = acpi_os_get_thread_id(); |
Bob Moore | 10b6575 | 2009-04-22 11:39:10 +0800 | [diff] [blame] | 297 | ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %p releasing Mutex [%s]\n", |
| 298 | ACPI_CAST_PTR(void, this_thread_id), |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 299 | acpi_ut_get_mutex_name(mutex_id))); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 300 | |
Bob Moore | 4c90ece | 2006-06-08 16:29:00 -0400 | [diff] [blame] | 301 | if (mutex_id > ACPI_MAX_MUTEX) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 302 | return (AE_BAD_PARAMETER); |
| 303 | } |
| 304 | |
| 305 | /* |
| 306 | * Mutex must be acquired in order to release it! |
| 307 | */ |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 308 | 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] | 309 | ACPI_ERROR((AE_INFO, |
| 310 | "Mutex [%X] is not acquired, cannot release", |
| 311 | mutex_id)); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 312 | |
| 313 | return (AE_NOT_ACQUIRED); |
| 314 | } |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 315 | #ifdef ACPI_MUTEX_DEBUG |
| 316 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 317 | u32 i; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 318 | /* |
| 319 | * Mutex debug code, for internal debugging only. |
| 320 | * |
| 321 | * Deadlock prevention. Check if this thread owns any mutexes of value |
| 322 | * greater than this one. If so, the thread has violated the mutex |
| 323 | * ordering rule. This indicates a coding error somewhere in |
| 324 | * the ACPI subsystem code. |
| 325 | */ |
Bob Moore | b53ce3f | 2008-06-10 14:30:04 +0800 | [diff] [blame] | 326 | for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) { |
Robert Moore | bda663d | 2005-09-16 16:51:15 -0400 | [diff] [blame] | 327 | if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 328 | if (i == mutex_id) { |
| 329 | continue; |
| 330 | } |
| 331 | |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 332 | ACPI_ERROR((AE_INFO, |
| 333 | "Invalid release order: owns [%s], releasing [%s]", |
| 334 | acpi_ut_get_mutex_name(i), |
| 335 | acpi_ut_get_mutex_name(mutex_id))); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 336 | |
| 337 | return (AE_RELEASE_DEADLOCK); |
| 338 | } |
| 339 | } |
| 340 | } |
| 341 | #endif |
| 342 | |
| 343 | /* Mark unlocked FIRST */ |
| 344 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 345 | acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED; |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 346 | |
Bob Moore | 967440e3 | 2006-06-23 17:04:00 -0400 | [diff] [blame] | 347 | acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex); |
| 348 | return (AE_OK); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 349 | } |