diff options
Diffstat (limited to 'drivers/acpi/executer/exmutex.c')
| -rw-r--r-- | drivers/acpi/executer/exmutex.c | 175 |
1 files changed, 77 insertions, 98 deletions
diff --git a/drivers/acpi/executer/exmutex.c b/drivers/acpi/executer/exmutex.c index 68c4bb1970a5..ab47f6d8b5c0 100644 --- a/drivers/acpi/executer/exmutex.c +++ b/drivers/acpi/executer/exmutex.c @@ -42,13 +42,16 @@ * POSSIBILITY OF SUCH DAMAGES. */ - #include <acpi/acpi.h> #include <acpi/acinterp.h> #define _COMPONENT ACPI_EXECUTER - ACPI_MODULE_NAME ("exmutex") +ACPI_MODULE_NAME("exmutex") +/* Local prototypes */ +static void +acpi_ex_link_mutex(union acpi_operand_object *obj_desc, + struct acpi_thread_state *thread); /******************************************************************************* * @@ -56,18 +59,15 @@ * * PARAMETERS: obj_desc - The mutex to be unlinked * - * RETURN: Status + * RETURN: None * * DESCRIPTION: Remove a mutex from the "acquired_mutex" list * ******************************************************************************/ -void -acpi_ex_unlink_mutex ( - union acpi_operand_object *obj_desc) +void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc) { - struct acpi_thread_state *thread = obj_desc->mutex.owner_thread; - + struct acpi_thread_state *thread = obj_desc->mutex.owner_thread; if (!thread) { return; @@ -81,33 +81,29 @@ acpi_ex_unlink_mutex ( if (obj_desc->mutex.prev) { (obj_desc->mutex.prev)->mutex.next = obj_desc->mutex.next; - } - else { + } else { thread->acquired_mutex_list = obj_desc->mutex.next; } } - /******************************************************************************* * * FUNCTION: acpi_ex_link_mutex * - * PARAMETERS: obj_desc - The mutex to be linked - * list_head - head of the "acquired_mutex" list + * PARAMETERS: obj_desc - The mutex to be linked + * Thread - Current executing thread object * - * RETURN: Status + * RETURN: None * * DESCRIPTION: Add a mutex to the "acquired_mutex" list for this walk * ******************************************************************************/ -void -acpi_ex_link_mutex ( - union acpi_operand_object *obj_desc, - struct acpi_thread_state *thread) +static void +acpi_ex_link_mutex(union acpi_operand_object *obj_desc, + struct acpi_thread_state *thread) { - union acpi_operand_object *list_head; - + union acpi_operand_object *list_head; list_head = thread->acquired_mutex_list; @@ -127,13 +123,13 @@ acpi_ex_link_mutex ( thread->acquired_mutex_list = obj_desc; } - /******************************************************************************* * * FUNCTION: acpi_ex_acquire_mutex * - * PARAMETERS: time_desc - The 'time to delay' object descriptor - * obj_desc - The object descriptor for this op + * PARAMETERS: time_desc - Timeout integer + * obj_desc - Mutex object + * walk_state - Current method execution state * * RETURN: Status * @@ -142,27 +138,23 @@ acpi_ex_link_mutex ( ******************************************************************************/ acpi_status -acpi_ex_acquire_mutex ( - union acpi_operand_object *time_desc, - union acpi_operand_object *obj_desc, - struct acpi_walk_state *walk_state) +acpi_ex_acquire_mutex(union acpi_operand_object *time_desc, + union acpi_operand_object *obj_desc, + struct acpi_walk_state *walk_state) { - acpi_status status; - - - ACPI_FUNCTION_TRACE_PTR ("ex_acquire_mutex", obj_desc); + acpi_status status; + ACPI_FUNCTION_TRACE_PTR("ex_acquire_mutex", obj_desc); if (!obj_desc) { - return_ACPI_STATUS (AE_BAD_PARAMETER); + return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Sanity check -- we must have a valid thread ID */ if (!walk_state->thread) { - ACPI_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], null thread info\n", - acpi_ut_get_node_name (obj_desc->mutex.node))); - return_ACPI_STATUS (AE_AML_INTERNAL); + ACPI_REPORT_ERROR(("Cannot acquire Mutex [%4.4s], null thread info\n", acpi_ut_get_node_name(obj_desc->mutex.node))); + return_ACPI_STATUS(AE_AML_INTERNAL); } /* @@ -170,9 +162,8 @@ acpi_ex_acquire_mutex ( * mutex. This mechanism provides some deadlock prevention */ if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) { - ACPI_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], incorrect sync_level\n", - acpi_ut_get_node_name (obj_desc->mutex.node))); - return_ACPI_STATUS (AE_AML_MUTEX_ORDER); + ACPI_REPORT_ERROR(("Cannot acquire Mutex [%4.4s], incorrect sync_level\n", acpi_ut_get_node_name(obj_desc->mutex.node))); + return_ACPI_STATUS(AE_AML_MUTEX_ORDER); } /* Support for multiple acquires by the owning thread */ @@ -180,47 +171,50 @@ acpi_ex_acquire_mutex ( if (obj_desc->mutex.owner_thread) { /* Special case for Global Lock, allow all threads */ - if ((obj_desc->mutex.owner_thread->thread_id == walk_state->thread->thread_id) || - (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore)) { + if ((obj_desc->mutex.owner_thread->thread_id == + walk_state->thread->thread_id) || + (obj_desc->mutex.semaphore == + acpi_gbl_global_lock_semaphore)) { /* * The mutex is already owned by this thread, * just increment the acquisition depth */ obj_desc->mutex.acquisition_depth++; - return_ACPI_STATUS (AE_OK); + return_ACPI_STATUS(AE_OK); } } /* Acquire the mutex, wait if necessary */ - status = acpi_ex_system_acquire_mutex (time_desc, obj_desc); - if (ACPI_FAILURE (status)) { + status = acpi_ex_system_acquire_mutex(time_desc, obj_desc); + if (ACPI_FAILURE(status)) { /* Includes failure from a timeout on time_desc */ - return_ACPI_STATUS (status); + return_ACPI_STATUS(status); } /* Have the mutex: update mutex and walk info and save the sync_level */ - obj_desc->mutex.owner_thread = walk_state->thread; + obj_desc->mutex.owner_thread = walk_state->thread; obj_desc->mutex.acquisition_depth = 1; - obj_desc->mutex.original_sync_level = walk_state->thread->current_sync_level; + obj_desc->mutex.original_sync_level = + walk_state->thread->current_sync_level; walk_state->thread->current_sync_level = obj_desc->mutex.sync_level; /* Link the mutex to the current thread for force-unlock at method exit */ - acpi_ex_link_mutex (obj_desc, walk_state->thread); + acpi_ex_link_mutex(obj_desc, walk_state->thread); - return_ACPI_STATUS (AE_OK); + return_ACPI_STATUS(AE_OK); } - /******************************************************************************* * * FUNCTION: acpi_ex_release_mutex * * PARAMETERS: obj_desc - The object descriptor for this op + * walk_state - Current method execution state * * RETURN: Status * @@ -229,48 +223,40 @@ acpi_ex_acquire_mutex ( ******************************************************************************/ acpi_status -acpi_ex_release_mutex ( - union acpi_operand_object *obj_desc, - struct acpi_walk_state *walk_state) +acpi_ex_release_mutex(union acpi_operand_object *obj_desc, + struct acpi_walk_state *walk_state) { - acpi_status status; - - - ACPI_FUNCTION_TRACE ("ex_release_mutex"); + acpi_status status; + ACPI_FUNCTION_TRACE("ex_release_mutex"); if (!obj_desc) { - return_ACPI_STATUS (AE_BAD_PARAMETER); + return_ACPI_STATUS(AE_BAD_PARAMETER); } /* The mutex must have been previously acquired in order to release it */ if (!obj_desc->mutex.owner_thread) { - ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], not acquired\n", - acpi_ut_get_node_name (obj_desc->mutex.node))); - return_ACPI_STATUS (AE_AML_MUTEX_NOT_ACQUIRED); + ACPI_REPORT_ERROR(("Cannot release Mutex [%4.4s], not acquired\n", acpi_ut_get_node_name(obj_desc->mutex.node))); + return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED); } /* Sanity check -- we must have a valid thread ID */ if (!walk_state->thread) { - ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], null thread info\n", - acpi_ut_get_node_name (obj_desc->mutex.node))); - return_ACPI_STATUS (AE_AML_INTERNAL); + ACPI_REPORT_ERROR(("Cannot release Mutex [%4.4s], null thread info\n", acpi_ut_get_node_name(obj_desc->mutex.node))); + return_ACPI_STATUS(AE_AML_INTERNAL); } /* * The Mutex is owned, but this thread must be the owner. * Special case for Global Lock, any thread can release */ - if ((obj_desc->mutex.owner_thread->thread_id != walk_state->thread->thread_id) && - (obj_desc->mutex.semaphore != acpi_gbl_global_lock_semaphore)) { - ACPI_REPORT_ERROR (( - "Thread %X cannot release Mutex [%4.4s] acquired by thread %X\n", - walk_state->thread->thread_id, - acpi_ut_get_node_name (obj_desc->mutex.node), - obj_desc->mutex.owner_thread->thread_id)); - return_ACPI_STATUS (AE_AML_NOT_OWNER); + if ((obj_desc->mutex.owner_thread->thread_id != + walk_state->thread->thread_id) + && (obj_desc->mutex.semaphore != acpi_gbl_global_lock_semaphore)) { + ACPI_REPORT_ERROR(("Thread %X cannot release Mutex [%4.4s] acquired by thread %X\n", walk_state->thread->thread_id, acpi_ut_get_node_name(obj_desc->mutex.node), obj_desc->mutex.owner_thread->thread_id)); + return_ACPI_STATUS(AE_AML_NOT_OWNER); } /* @@ -278,9 +264,8 @@ acpi_ex_release_mutex ( * equal to the current sync level */ if (obj_desc->mutex.sync_level > walk_state->thread->current_sync_level) { - ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], incorrect sync_level\n", - acpi_ut_get_node_name (obj_desc->mutex.node))); - return_ACPI_STATUS (AE_AML_MUTEX_ORDER); + ACPI_REPORT_ERROR(("Cannot release Mutex [%4.4s], incorrect sync_level\n", acpi_ut_get_node_name(obj_desc->mutex.node))); + return_ACPI_STATUS(AE_AML_MUTEX_ORDER); } /* Match multiple Acquires with multiple Releases */ @@ -289,49 +274,45 @@ acpi_ex_release_mutex ( if (obj_desc->mutex.acquisition_depth != 0) { /* Just decrement the depth and return */ - return_ACPI_STATUS (AE_OK); + return_ACPI_STATUS(AE_OK); } /* Unlink the mutex from the owner's list */ - acpi_ex_unlink_mutex (obj_desc); + acpi_ex_unlink_mutex(obj_desc); /* Release the mutex */ - status = acpi_ex_system_release_mutex (obj_desc); + status = acpi_ex_system_release_mutex(obj_desc); /* Update the mutex and walk state, restore sync_level before acquire */ obj_desc->mutex.owner_thread = NULL; - walk_state->thread->current_sync_level = obj_desc->mutex.original_sync_level; + walk_state->thread->current_sync_level = + obj_desc->mutex.original_sync_level; - return_ACPI_STATUS (status); + return_ACPI_STATUS(status); } - /******************************************************************************* * * FUNCTION: acpi_ex_release_all_mutexes * - * PARAMETERS: mutex_list - Head of the mutex list + * PARAMETERS: Thread - Current executing thread object * * RETURN: Status * - * DESCRIPTION: Release all mutexes in the list + * DESCRIPTION: Release all mutexes held by this thread * ******************************************************************************/ -void -acpi_ex_release_all_mutexes ( - struct acpi_thread_state *thread) +void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread) { - union acpi_operand_object *next = thread->acquired_mutex_list; - union acpi_operand_object *this; - acpi_status status; - - - ACPI_FUNCTION_ENTRY (); + union acpi_operand_object *next = thread->acquired_mutex_list; + union acpi_operand_object *this; + acpi_status status; + ACPI_FUNCTION_ENTRY(); /* Traverse the list of owned mutexes, releasing each one */ @@ -340,13 +321,13 @@ acpi_ex_release_all_mutexes ( next = this->mutex.next; this->mutex.acquisition_depth = 1; - this->mutex.prev = NULL; - this->mutex.next = NULL; + this->mutex.prev = NULL; + this->mutex.next = NULL; - /* Release the mutex */ + /* Release the mutex */ - status = acpi_ex_system_release_mutex (this); - if (ACPI_FAILURE (status)) { + status = acpi_ex_system_release_mutex(this); + if (ACPI_FAILURE(status)) { continue; } @@ -359,5 +340,3 @@ acpi_ex_release_all_mutexes ( thread->current_sync_level = this->mutex.original_sync_level; } } - - |