| 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: exmutex - ASL Mutex Acquire/Release functions |
| 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.h" |
| 45 | #include "accommon.h" |
| 46 | #include "acinterp.h" |
| 47 | #include "acevents.h" |
| 48 | |
| 49 | #define _COMPONENT ACPI_EXECUTER |
| 50 | ACPI_MODULE_NAME ("exmutex" ) |
| 51 | |
| 52 | /* Local prototypes */ |
| 53 | |
| 54 | static void |
| 55 | AcpiExLinkMutex ( |
| 56 | ACPI_OPERAND_OBJECT *ObjDesc, |
| 57 | ACPI_THREAD_STATE *Thread); |
| 58 | |
| 59 | |
| 60 | /******************************************************************************* |
| 61 | * |
| 62 | * FUNCTION: AcpiExUnlinkMutex |
| 63 | * |
| 64 | * PARAMETERS: ObjDesc - The mutex to be unlinked |
| 65 | * |
| 66 | * RETURN: None |
| 67 | * |
| 68 | * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list |
| 69 | * |
| 70 | ******************************************************************************/ |
| 71 | |
| 72 | void |
| 73 | AcpiExUnlinkMutex ( |
| 74 | ACPI_OPERAND_OBJECT *ObjDesc) |
| 75 | { |
| 76 | ACPI_THREAD_STATE *Thread = ObjDesc->Mutex.OwnerThread; |
| 77 | |
| 78 | |
| 79 | if (!Thread) |
| 80 | { |
| 81 | return; |
| 82 | } |
| 83 | |
| 84 | /* Doubly linked list */ |
| 85 | |
| 86 | if (ObjDesc->Mutex.Next) |
| 87 | { |
| 88 | (ObjDesc->Mutex.Next)->Mutex.Prev = ObjDesc->Mutex.Prev; |
| 89 | } |
| 90 | |
| 91 | if (ObjDesc->Mutex.Prev) |
| 92 | { |
| 93 | (ObjDesc->Mutex.Prev)->Mutex.Next = ObjDesc->Mutex.Next; |
| 94 | |
| 95 | /* |
| 96 | * Migrate the previous sync level associated with this mutex to |
| 97 | * the previous mutex on the list so that it may be preserved. |
| 98 | * This handles the case where several mutexes have been acquired |
| 99 | * at the same level, but are not released in opposite order. |
| 100 | */ |
| 101 | (ObjDesc->Mutex.Prev)->Mutex.OriginalSyncLevel = |
| 102 | ObjDesc->Mutex.OriginalSyncLevel; |
| 103 | } |
| 104 | else |
| 105 | { |
| 106 | Thread->AcquiredMutexList = ObjDesc->Mutex.Next; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | |
| 111 | /******************************************************************************* |
| 112 | * |
| 113 | * FUNCTION: AcpiExLinkMutex |
| 114 | * |
| 115 | * PARAMETERS: ObjDesc - The mutex to be linked |
| 116 | * Thread - Current executing thread object |
| 117 | * |
| 118 | * RETURN: None |
| 119 | * |
| 120 | * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk |
| 121 | * |
| 122 | ******************************************************************************/ |
| 123 | |
| 124 | static void |
| 125 | AcpiExLinkMutex ( |
| 126 | ACPI_OPERAND_OBJECT *ObjDesc, |
| 127 | ACPI_THREAD_STATE *Thread) |
| 128 | { |
| 129 | ACPI_OPERAND_OBJECT *ListHead; |
| 130 | |
| 131 | |
| 132 | ListHead = Thread->AcquiredMutexList; |
| 133 | |
| 134 | /* This object will be the first object in the list */ |
| 135 | |
| 136 | ObjDesc->Mutex.Prev = NULL; |
| 137 | ObjDesc->Mutex.Next = ListHead; |
| 138 | |
| 139 | /* Update old first object to point back to this object */ |
| 140 | |
| 141 | if (ListHead) |
| 142 | { |
| 143 | ListHead->Mutex.Prev = ObjDesc; |
| 144 | } |
| 145 | |
| 146 | /* Update list head */ |
| 147 | |
| 148 | Thread->AcquiredMutexList = ObjDesc; |
| 149 | } |
| 150 | |
| 151 | |
| 152 | /******************************************************************************* |
| 153 | * |
| 154 | * FUNCTION: AcpiExAcquireMutexObject |
| 155 | * |
| 156 | * PARAMETERS: Timeout - Timeout in milliseconds |
| 157 | * ObjDesc - Mutex object |
| 158 | * ThreadId - Current thread state |
| 159 | * |
| 160 | * RETURN: Status |
| 161 | * |
| 162 | * DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common |
| 163 | * path that supports multiple acquires by the same thread. |
| 164 | * |
| 165 | * MUTEX: Interpreter must be locked |
| 166 | * |
| 167 | * NOTE: This interface is called from three places: |
| 168 | * 1) From AcpiExAcquireMutex, via an AML Acquire() operator |
| 169 | * 2) From AcpiExAcquireGlobalLock when an AML Field access requires the |
| 170 | * global lock |
| 171 | * 3) From the external interface, AcpiAcquireGlobalLock |
| 172 | * |
| 173 | ******************************************************************************/ |
| 174 | |
| 175 | ACPI_STATUS |
| 176 | AcpiExAcquireMutexObject ( |
| 177 | UINT16 Timeout, |
| 178 | ACPI_OPERAND_OBJECT *ObjDesc, |
| 179 | ACPI_THREAD_ID ThreadId) |
| 180 | { |
| 181 | ACPI_STATUS Status; |
| 182 | |
| 183 | |
| 184 | ACPI_FUNCTION_TRACE_PTR (ExAcquireMutexObject, ObjDesc); |
| 185 | |
| 186 | |
| 187 | if (!ObjDesc) |
| 188 | { |
| 189 | return_ACPI_STATUS (AE_BAD_PARAMETER); |
| 190 | } |
| 191 | |
| 192 | /* Support for multiple acquires by the owning thread */ |
| 193 | |
| 194 | if (ObjDesc->Mutex.ThreadId == ThreadId) |
| 195 | { |
| 196 | /* |
| 197 | * The mutex is already owned by this thread, just increment the |
| 198 | * acquisition depth |
| 199 | */ |
| 200 | ObjDesc->Mutex.AcquisitionDepth++; |
| 201 | return_ACPI_STATUS (AE_OK); |
| 202 | } |
| 203 | |
| 204 | /* Acquire the mutex, wait if necessary. Special case for Global Lock */ |
| 205 | |
| 206 | if (ObjDesc == AcpiGbl_GlobalLockMutex) |
| 207 | { |
| 208 | Status = AcpiEvAcquireGlobalLock (Timeout); |
| 209 | } |
| 210 | else |
| 211 | { |
| 212 | Status = AcpiExSystemWaitMutex (ObjDesc->Mutex.OsMutex, Timeout); |
| 213 | } |
| 214 | |
| 215 | if (ACPI_FAILURE (Status)) |
| 216 | { |
| 217 | /* Includes failure from a timeout on TimeDesc */ |
| 218 | |
| 219 | return_ACPI_STATUS (Status); |
| 220 | } |
| 221 | |
| 222 | /* Acquired the mutex: update mutex object */ |
| 223 | |
| 224 | ObjDesc->Mutex.ThreadId = ThreadId; |
| 225 | ObjDesc->Mutex.AcquisitionDepth = 1; |
| 226 | ObjDesc->Mutex.OriginalSyncLevel = 0; |
| 227 | ObjDesc->Mutex.OwnerThread = NULL; /* Used only for AML Acquire() */ |
| 228 | |
| 229 | return_ACPI_STATUS (AE_OK); |
| 230 | } |
| 231 | |
| 232 | |
| 233 | /******************************************************************************* |
| 234 | * |
| 235 | * FUNCTION: AcpiExAcquireMutex |
| 236 | * |
| 237 | * PARAMETERS: TimeDesc - Timeout integer |
| 238 | * ObjDesc - Mutex object |
| 239 | * WalkState - Current method execution state |
| 240 | * |
| 241 | * RETURN: Status |
| 242 | * |
| 243 | * DESCRIPTION: Acquire an AML mutex |
| 244 | * |
| 245 | ******************************************************************************/ |
| 246 | |
| 247 | ACPI_STATUS |
| 248 | AcpiExAcquireMutex ( |
| 249 | ACPI_OPERAND_OBJECT *TimeDesc, |
| 250 | ACPI_OPERAND_OBJECT *ObjDesc, |
| 251 | ACPI_WALK_STATE *WalkState) |
| 252 | { |
| 253 | ACPI_STATUS Status; |
| 254 | |
| 255 | |
| 256 | ACPI_FUNCTION_TRACE_PTR (ExAcquireMutex, ObjDesc); |
| 257 | |
| 258 | |
| 259 | if (!ObjDesc) |
| 260 | { |
| 261 | return_ACPI_STATUS (AE_BAD_PARAMETER); |
| 262 | } |
| 263 | |
| 264 | /* Must have a valid thread state struct */ |
| 265 | |
| 266 | if (!WalkState->Thread) |
| 267 | { |
| 268 | ACPI_ERROR ((AE_INFO, |
| 269 | "Cannot acquire Mutex [%4.4s], null thread info" , |
| 270 | AcpiUtGetNodeName (ObjDesc->Mutex.Node))); |
| 271 | return_ACPI_STATUS (AE_AML_INTERNAL); |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | * Current sync level must be less than or equal to the sync level |
| 276 | * of the mutex. This mechanism provides some deadlock prevention. |
| 277 | */ |
| 278 | if (WalkState->Thread->CurrentSyncLevel > ObjDesc->Mutex.SyncLevel) |
| 279 | { |
| 280 | ACPI_ERROR ((AE_INFO, |
| 281 | "Cannot acquire Mutex [%4.4s], " |
| 282 | "current SyncLevel is too large (%u)" , |
| 283 | AcpiUtGetNodeName (ObjDesc->Mutex.Node), |
| 284 | WalkState->Thread->CurrentSyncLevel)); |
| 285 | return_ACPI_STATUS (AE_AML_MUTEX_ORDER); |
| 286 | } |
| 287 | |
| 288 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| 289 | "Acquiring: Mutex SyncLevel %u, Thread SyncLevel %u, " |
| 290 | "Depth %u TID %p\n" , |
| 291 | ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel, |
| 292 | ObjDesc->Mutex.AcquisitionDepth, WalkState->Thread)); |
| 293 | |
| 294 | Status = AcpiExAcquireMutexObject ((UINT16) TimeDesc->Integer.Value, |
| 295 | ObjDesc, WalkState->Thread->ThreadId); |
| 296 | |
| 297 | if (ACPI_SUCCESS (Status) && ObjDesc->Mutex.AcquisitionDepth == 1) |
| 298 | { |
| 299 | /* Save Thread object, original/current sync levels */ |
| 300 | |
| 301 | ObjDesc->Mutex.OwnerThread = WalkState->Thread; |
| 302 | ObjDesc->Mutex.OriginalSyncLevel = |
| 303 | WalkState->Thread->CurrentSyncLevel; |
| 304 | WalkState->Thread->CurrentSyncLevel = |
| 305 | ObjDesc->Mutex.SyncLevel; |
| 306 | |
| 307 | /* Link the mutex to the current thread for force-unlock at method exit */ |
| 308 | |
| 309 | AcpiExLinkMutex (ObjDesc, WalkState->Thread); |
| 310 | } |
| 311 | |
| 312 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| 313 | "Acquired: Mutex SyncLevel %u, Thread SyncLevel %u, Depth %u\n" , |
| 314 | ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel, |
| 315 | ObjDesc->Mutex.AcquisitionDepth)); |
| 316 | |
| 317 | return_ACPI_STATUS (Status); |
| 318 | } |
| 319 | |
| 320 | |
| 321 | /******************************************************************************* |
| 322 | * |
| 323 | * FUNCTION: AcpiExReleaseMutexObject |
| 324 | * |
| 325 | * PARAMETERS: ObjDesc - The object descriptor for this op |
| 326 | * |
| 327 | * RETURN: Status |
| 328 | * |
| 329 | * DESCRIPTION: Release a previously acquired Mutex, low level interface. |
| 330 | * Provides a common path that supports multiple releases (after |
| 331 | * previous multiple acquires) by the same thread. |
| 332 | * |
| 333 | * MUTEX: Interpreter must be locked |
| 334 | * |
| 335 | * NOTE: This interface is called from three places: |
| 336 | * 1) From AcpiExReleaseMutex, via an AML Acquire() operator |
| 337 | * 2) From AcpiExReleaseGlobalLock when an AML Field access requires the |
| 338 | * global lock |
| 339 | * 3) From the external interface, AcpiReleaseGlobalLock |
| 340 | * |
| 341 | ******************************************************************************/ |
| 342 | |
| 343 | ACPI_STATUS |
| 344 | AcpiExReleaseMutexObject ( |
| 345 | ACPI_OPERAND_OBJECT *ObjDesc) |
| 346 | { |
| 347 | ACPI_STATUS Status = AE_OK; |
| 348 | |
| 349 | |
| 350 | ACPI_FUNCTION_TRACE (ExReleaseMutexObject); |
| 351 | |
| 352 | |
| 353 | if (ObjDesc->Mutex.AcquisitionDepth == 0) |
| 354 | { |
| 355 | return_ACPI_STATUS (AE_NOT_ACQUIRED); |
| 356 | } |
| 357 | |
| 358 | /* Match multiple Acquires with multiple Releases */ |
| 359 | |
| 360 | ObjDesc->Mutex.AcquisitionDepth--; |
| 361 | if (ObjDesc->Mutex.AcquisitionDepth != 0) |
| 362 | { |
| 363 | /* Just decrement the depth and return */ |
| 364 | |
| 365 | return_ACPI_STATUS (AE_OK); |
| 366 | } |
| 367 | |
| 368 | if (ObjDesc->Mutex.OwnerThread) |
| 369 | { |
| 370 | /* Unlink the mutex from the owner's list */ |
| 371 | |
| 372 | AcpiExUnlinkMutex (ObjDesc); |
| 373 | ObjDesc->Mutex.OwnerThread = NULL; |
| 374 | } |
| 375 | |
| 376 | /* Release the mutex, special case for Global Lock */ |
| 377 | |
| 378 | if (ObjDesc == AcpiGbl_GlobalLockMutex) |
| 379 | { |
| 380 | Status = AcpiEvReleaseGlobalLock (); |
| 381 | } |
| 382 | else |
| 383 | { |
| 384 | AcpiOsReleaseMutex (ObjDesc->Mutex.OsMutex); |
| 385 | } |
| 386 | |
| 387 | /* Clear mutex info */ |
| 388 | |
| 389 | ObjDesc->Mutex.ThreadId = 0; |
| 390 | return_ACPI_STATUS (Status); |
| 391 | } |
| 392 | |
| 393 | |
| 394 | /******************************************************************************* |
| 395 | * |
| 396 | * FUNCTION: AcpiExReleaseMutex |
| 397 | * |
| 398 | * PARAMETERS: ObjDesc - The object descriptor for this op |
| 399 | * WalkState - Current method execution state |
| 400 | * |
| 401 | * RETURN: Status |
| 402 | * |
| 403 | * DESCRIPTION: Release a previously acquired Mutex. |
| 404 | * |
| 405 | ******************************************************************************/ |
| 406 | |
| 407 | ACPI_STATUS |
| 408 | AcpiExReleaseMutex ( |
| 409 | ACPI_OPERAND_OBJECT *ObjDesc, |
| 410 | ACPI_WALK_STATE *WalkState) |
| 411 | { |
| 412 | UINT8 PreviousSyncLevel; |
| 413 | ACPI_THREAD_STATE *OwnerThread; |
| 414 | ACPI_STATUS Status = AE_OK; |
| 415 | |
| 416 | |
| 417 | ACPI_FUNCTION_TRACE (ExReleaseMutex); |
| 418 | |
| 419 | |
| 420 | if (!ObjDesc) |
| 421 | { |
| 422 | return_ACPI_STATUS (AE_BAD_PARAMETER); |
| 423 | } |
| 424 | |
| 425 | OwnerThread = ObjDesc->Mutex.OwnerThread; |
| 426 | |
| 427 | /* The mutex must have been previously acquired in order to release it */ |
| 428 | |
| 429 | if (!OwnerThread) |
| 430 | { |
| 431 | ACPI_ERROR ((AE_INFO, |
| 432 | "Cannot release Mutex [%4.4s], not acquired" , |
| 433 | AcpiUtGetNodeName (ObjDesc->Mutex.Node))); |
| 434 | return_ACPI_STATUS (AE_AML_MUTEX_NOT_ACQUIRED); |
| 435 | } |
| 436 | |
| 437 | /* Must have a valid thread ID */ |
| 438 | |
| 439 | if (!WalkState->Thread) |
| 440 | { |
| 441 | ACPI_ERROR ((AE_INFO, |
| 442 | "Cannot release Mutex [%4.4s], null thread info" , |
| 443 | AcpiUtGetNodeName (ObjDesc->Mutex.Node))); |
| 444 | return_ACPI_STATUS (AE_AML_INTERNAL); |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * The Mutex is owned, but this thread must be the owner. |
| 449 | * Special case for Global Lock, any thread can release |
| 450 | */ |
| 451 | if ((OwnerThread->ThreadId != WalkState->Thread->ThreadId) && |
| 452 | (ObjDesc != AcpiGbl_GlobalLockMutex)) |
| 453 | { |
| 454 | ACPI_ERROR ((AE_INFO, |
| 455 | "Thread %u cannot release Mutex [%4.4s] acquired by thread %u" , |
| 456 | (UINT32) WalkState->Thread->ThreadId, |
| 457 | AcpiUtGetNodeName (ObjDesc->Mutex.Node), |
| 458 | (UINT32) OwnerThread->ThreadId)); |
| 459 | return_ACPI_STATUS (AE_AML_NOT_OWNER); |
| 460 | } |
| 461 | |
| 462 | /* |
| 463 | * The sync level of the mutex must be equal to the current sync level. In |
| 464 | * other words, the current level means that at least one mutex at that |
| 465 | * level is currently being held. Attempting to release a mutex of a |
| 466 | * different level can only mean that the mutex ordering rule is being |
| 467 | * violated. This behavior is clarified in ACPI 4.0 specification. |
| 468 | */ |
| 469 | if (ObjDesc->Mutex.SyncLevel != OwnerThread->CurrentSyncLevel) |
| 470 | { |
| 471 | ACPI_ERROR ((AE_INFO, |
| 472 | "Cannot release Mutex [%4.4s], SyncLevel mismatch: " |
| 473 | "mutex %u current %u" , |
| 474 | AcpiUtGetNodeName (ObjDesc->Mutex.Node), |
| 475 | ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel)); |
| 476 | return_ACPI_STATUS (AE_AML_MUTEX_ORDER); |
| 477 | } |
| 478 | |
| 479 | /* |
| 480 | * Get the previous SyncLevel from the head of the acquired mutex list. |
| 481 | * This handles the case where several mutexes at the same level have been |
| 482 | * acquired, but are not released in reverse order. |
| 483 | */ |
| 484 | PreviousSyncLevel = |
| 485 | OwnerThread->AcquiredMutexList->Mutex.OriginalSyncLevel; |
| 486 | |
| 487 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| 488 | "Releasing: Object SyncLevel %u, Thread SyncLevel %u, " |
| 489 | "Prev SyncLevel %u, Depth %u TID %p\n" , |
| 490 | ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel, |
| 491 | PreviousSyncLevel, ObjDesc->Mutex.AcquisitionDepth, |
| 492 | WalkState->Thread)); |
| 493 | |
| 494 | Status = AcpiExReleaseMutexObject (ObjDesc); |
| 495 | if (ACPI_FAILURE (Status)) |
| 496 | { |
| 497 | return_ACPI_STATUS (Status); |
| 498 | } |
| 499 | |
| 500 | if (ObjDesc->Mutex.AcquisitionDepth == 0) |
| 501 | { |
| 502 | /* Restore the previous SyncLevel */ |
| 503 | |
| 504 | OwnerThread->CurrentSyncLevel = PreviousSyncLevel; |
| 505 | } |
| 506 | |
| 507 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| 508 | "Released: Object SyncLevel %u, Thread SyncLevel, %u, " |
| 509 | "Prev SyncLevel %u, Depth %u\n" , |
| 510 | ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel, |
| 511 | PreviousSyncLevel, ObjDesc->Mutex.AcquisitionDepth)); |
| 512 | |
| 513 | return_ACPI_STATUS (Status); |
| 514 | } |
| 515 | |
| 516 | |
| 517 | /******************************************************************************* |
| 518 | * |
| 519 | * FUNCTION: AcpiExReleaseAllMutexes |
| 520 | * |
| 521 | * PARAMETERS: Thread - Current executing thread object |
| 522 | * |
| 523 | * RETURN: Status |
| 524 | * |
| 525 | * DESCRIPTION: Release all mutexes held by this thread |
| 526 | * |
| 527 | * NOTE: This function is called as the thread is exiting the interpreter. |
| 528 | * Mutexes are not released when an individual control method is exited, but |
| 529 | * only when the parent thread actually exits the interpreter. This allows one |
| 530 | * method to acquire a mutex, and a different method to release it, as long as |
| 531 | * this is performed underneath a single parent control method. |
| 532 | * |
| 533 | ******************************************************************************/ |
| 534 | |
| 535 | void |
| 536 | AcpiExReleaseAllMutexes ( |
| 537 | ACPI_THREAD_STATE *Thread) |
| 538 | { |
| 539 | ACPI_OPERAND_OBJECT *Next = Thread->AcquiredMutexList; |
| 540 | ACPI_OPERAND_OBJECT *ObjDesc; |
| 541 | |
| 542 | |
| 543 | ACPI_FUNCTION_TRACE (ExReleaseAllMutexes); |
| 544 | |
| 545 | |
| 546 | /* Traverse the list of owned mutexes, releasing each one */ |
| 547 | |
| 548 | while (Next) |
| 549 | { |
| 550 | ObjDesc = Next; |
| 551 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| 552 | "Mutex [%4.4s] force-release, SyncLevel %u Depth %u\n" , |
| 553 | ObjDesc->Mutex.Node->Name.Ascii, ObjDesc->Mutex.SyncLevel, |
| 554 | ObjDesc->Mutex.AcquisitionDepth)); |
| 555 | |
| 556 | /* Release the mutex, special case for Global Lock */ |
| 557 | |
| 558 | if (ObjDesc == AcpiGbl_GlobalLockMutex) |
| 559 | { |
| 560 | /* Ignore errors */ |
| 561 | |
| 562 | (void) AcpiEvReleaseGlobalLock (); |
| 563 | } |
| 564 | else |
| 565 | { |
| 566 | AcpiOsReleaseMutex (ObjDesc->Mutex.OsMutex); |
| 567 | } |
| 568 | |
| 569 | /* Update Thread SyncLevel (Last mutex is the important one) */ |
| 570 | |
| 571 | Thread->CurrentSyncLevel = ObjDesc->Mutex.OriginalSyncLevel; |
| 572 | |
| 573 | /* Mark mutex unowned */ |
| 574 | |
| 575 | Next = ObjDesc->Mutex.Next; |
| 576 | |
| 577 | ObjDesc->Mutex.Prev = NULL; |
| 578 | ObjDesc->Mutex.Next = NULL; |
| 579 | ObjDesc->Mutex.AcquisitionDepth = 0; |
| 580 | ObjDesc->Mutex.OwnerThread = NULL; |
| 581 | ObjDesc->Mutex.ThreadId = 0; |
| 582 | } |
| 583 | |
| 584 | return_VOID; |
| 585 | } |
| 586 | |