541 lines
16 KiB
C
541 lines
16 KiB
C
|
/******************************************************************************
|
||
|
|
*
|
||
|
|
* Module Name: exmutex - ASL Mutex Acquire/Release functions
|
||
|
|
*
|
||
|
|
*****************************************************************************/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2000 - 2016, Intel Corp.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions, and the following disclaimer,
|
||
|
|
* without modification.
|
||
|
|
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
|
||
|
|
* substantially similar to the "NO WARRANTY" disclaimer below
|
||
|
|
* ("Disclaimer") and any redistribution must be conditioned upon
|
||
|
|
* including a substantially similar Disclaimer requirement for further
|
||
|
|
* binary redistribution.
|
||
|
|
* 3. Neither the names of the above-listed copyright holders nor the names
|
||
|
|
* of any contributors may be used to endorse or promote products derived
|
||
|
|
* from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* Alternatively, this software may be distributed under the terms of the
|
||
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
||
|
|
* Software Foundation.
|
||
|
|
*
|
||
|
|
* NO WARRANTY
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
|
||
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||
|
|
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
||
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
* POSSIBILITY OF SUCH DAMAGES.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <acpi/acpi.h>
|
||
|
|
#include "accommon.h"
|
||
|
|
#include "acinterp.h"
|
||
|
|
#include "acevents.h"
|
||
|
|
|
||
|
|
#define _COMPONENT ACPI_EXECUTER
|
||
|
|
ACPI_MODULE_NAME("exmutex")
|
||
|
|
|
||
|
|
/* Local prototypes */
|
||
|
|
static void
|
||
|
|
acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
|
||
|
|
struct acpi_thread_state *thread);
|
||
|
|
|
||
|
|
/*******************************************************************************
|
||
|
|
*
|
||
|
|
* FUNCTION: acpi_ex_unlink_mutex
|
||
|
|
*
|
||
|
|
* PARAMETERS: obj_desc - The mutex to be unlinked
|
||
|
|
*
|
||
|
|
* RETURN: None
|
||
|
|
*
|
||
|
|
* DESCRIPTION: Remove a mutex from the "AcquiredMutex" list
|
||
|
|
*
|
||
|
|
******************************************************************************/
|
||
|
|
|
||
|
|
void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc)
|
||
|
|
{
|
||
|
|
struct acpi_thread_state *thread = obj_desc->mutex.owner_thread;
|
||
|
|
|
||
|
|
if (!thread) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Doubly linked list */
|
||
|
|
|
||
|
|
if (obj_desc->mutex.next) {
|
||
|
|
(obj_desc->mutex.next)->mutex.prev = obj_desc->mutex.prev;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (obj_desc->mutex.prev) {
|
||
|
|
(obj_desc->mutex.prev)->mutex.next = obj_desc->mutex.next;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Migrate the previous sync level associated with this mutex to
|
||
|
|
* the previous mutex on the list so that it may be preserved.
|
||
|
|
* This handles the case where several mutexes have been acquired
|
||
|
|
* at the same level, but are not released in opposite order.
|
||
|
|
*/
|
||
|
|
(obj_desc->mutex.prev)->mutex.original_sync_level =
|
||
|
|
obj_desc->mutex.original_sync_level;
|
||
|
|
} else {
|
||
|
|
thread->acquired_mutex_list = obj_desc->mutex.next;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*******************************************************************************
|
||
|
|
*
|
||
|
|
* FUNCTION: acpi_ex_link_mutex
|
||
|
|
*
|
||
|
|
* PARAMETERS: obj_desc - The mutex to be linked
|
||
|
|
* thread - Current executing thread object
|
||
|
|
*
|
||
|
|
* RETURN: None
|
||
|
|
*
|
||
|
|
* DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk
|
||
|
|
*
|
||
|
|
******************************************************************************/
|
||
|
|
|
||
|
|
static void
|
||
|
|
acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
|
||
|
|
struct acpi_thread_state *thread)
|
||
|
|
{
|
||
|
|
union acpi_operand_object *list_head;
|
||
|
|
|
||
|
|
list_head = thread->acquired_mutex_list;
|
||
|
|
|
||
|
|
/* This object will be the first object in the list */
|
||
|
|
|
||
|
|
obj_desc->mutex.prev = NULL;
|
||
|
|
obj_desc->mutex.next = list_head;
|
||
|
|
|
||
|
|
/* Update old first object to point back to this object */
|
||
|
|
|
||
|
|
if (list_head) {
|
||
|
|
list_head->mutex.prev = obj_desc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Update list head */
|
||
|
|
|
||
|
|
thread->acquired_mutex_list = obj_desc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*******************************************************************************
|
||
|
|
*
|
||
|
|
* FUNCTION: acpi_ex_acquire_mutex_object
|
||
|
|
*
|
||
|
|
* PARAMETERS: timeout - Timeout in milliseconds
|
||
|
|
* obj_desc - Mutex object
|
||
|
|
* thread_id - Current thread state
|
||
|
|
*
|
||
|
|
* RETURN: Status
|
||
|
|
*
|
||
|
|
* DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common
|
||
|
|
* path that supports multiple acquires by the same thread.
|
||
|
|
*
|
||
|
|
* MUTEX: Interpreter must be locked
|
||
|
|
*
|
||
|
|
* NOTE: This interface is called from three places:
|
||
|
|
* 1) From acpi_ex_acquire_mutex, via an AML Acquire() operator
|
||
|
|
* 2) From acpi_ex_acquire_global_lock when an AML Field access requires the
|
||
|
|
* global lock
|
||
|
|
* 3) From the external interface, acpi_acquire_global_lock
|
||
|
|
*
|
||
|
|
******************************************************************************/
|
||
|
|
|
||
|
|
acpi_status
|
||
|
|
acpi_ex_acquire_mutex_object(u16 timeout,
|
||
|
|
union acpi_operand_object *obj_desc,
|
||
|
|
acpi_thread_id thread_id)
|
||
|
|
{
|
||
|
|
acpi_status status;
|
||
|
|
|
||
|
|
ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex_object, obj_desc);
|
||
|
|
|
||
|
|
if (!obj_desc) {
|
||
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Support for multiple acquires by the owning thread */
|
||
|
|
|
||
|
|
if (obj_desc->mutex.thread_id == thread_id) {
|
||
|
|
/*
|
||
|
|
* The mutex is already owned by this thread, just increment the
|
||
|
|
* acquisition depth
|
||
|
|
*/
|
||
|
|
obj_desc->mutex.acquisition_depth++;
|
||
|
|
return_ACPI_STATUS(AE_OK);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Acquire the mutex, wait if necessary. Special case for Global Lock */
|
||
|
|
|
||
|
|
if (obj_desc == acpi_gbl_global_lock_mutex) {
|
||
|
|
status = acpi_ev_acquire_global_lock(timeout);
|
||
|
|
} else {
|
||
|
|
status =
|
||
|
|
acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
|
||
|
|
timeout);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ACPI_FAILURE(status)) {
|
||
|
|
|
||
|
|
/* Includes failure from a timeout on time_desc */
|
||
|
|
|
||
|
|
return_ACPI_STATUS(status);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Acquired the mutex: update mutex object */
|
||
|
|
|
||
|
|
obj_desc->mutex.thread_id = thread_id;
|
||
|
|
obj_desc->mutex.acquisition_depth = 1;
|
||
|
|
obj_desc->mutex.original_sync_level = 0;
|
||
|
|
obj_desc->mutex.owner_thread = NULL; /* Used only for AML Acquire() */
|
||
|
|
|
||
|
|
return_ACPI_STATUS(AE_OK);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*******************************************************************************
|
||
|
|
*
|
||
|
|
* FUNCTION: acpi_ex_acquire_mutex
|
||
|
|
*
|
||
|
|
* PARAMETERS: time_desc - Timeout integer
|
||
|
|
* obj_desc - Mutex object
|
||
|
|
* walk_state - Current method execution state
|
||
|
|
*
|
||
|
|
* RETURN: Status
|
||
|
|
*
|
||
|
|
* DESCRIPTION: Acquire an AML 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_status status;
|
||
|
|
|
||
|
|
ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex, obj_desc);
|
||
|
|
|
||
|
|
if (!obj_desc) {
|
||
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Must have a valid thread state struct */
|
||
|
|
|
||
|
|
if (!walk_state->thread) {
|
||
|
|
ACPI_ERROR((AE_INFO,
|
||
|
|
"Cannot acquire Mutex [%4.4s], null thread info",
|
||
|
|
acpi_ut_get_node_name(obj_desc->mutex.node)));
|
||
|
|
return_ACPI_STATUS(AE_AML_INTERNAL);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Current sync level must be less than or equal to the sync level
|
||
|
|
* of the mutex. This mechanism provides some deadlock prevention.
|
||
|
|
*/
|
||
|
|
if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) {
|
||
|
|
ACPI_ERROR((AE_INFO,
|
||
|
|
"Cannot acquire Mutex [%4.4s], "
|
||
|
|
"current SyncLevel is too large (%u)",
|
||
|
|
acpi_ut_get_node_name(obj_desc->mutex.node),
|
||
|
|
walk_state->thread->current_sync_level));
|
||
|
|
return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
|
||
|
|
}
|
||
|
|
|
||
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
||
|
|
"Acquiring: Mutex SyncLevel %u, Thread SyncLevel %u, "
|
||
|
|
"Depth %u TID %p\n",
|
||
|
|
obj_desc->mutex.sync_level,
|
||
|
|
walk_state->thread->current_sync_level,
|
||
|
|
obj_desc->mutex.acquisition_depth,
|
||
|
|
walk_state->thread));
|
||
|
|
|
||
|
|
status = acpi_ex_acquire_mutex_object((u16)time_desc->integer.value,
|
||
|
|
obj_desc,
|
||
|
|
walk_state->thread->thread_id);
|
||
|
|
|
||
|
|
if (ACPI_SUCCESS(status) && obj_desc->mutex.acquisition_depth == 1) {
|
||
|
|
|
||
|
|
/* Save Thread object, original/current sync levels */
|
||
|
|
|
||
|
|
obj_desc->mutex.owner_thread = walk_state->thread;
|
||
|
|
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_DEBUG_PRINT((ACPI_DB_EXEC,
|
||
|
|
"Acquired: Mutex SyncLevel %u, Thread SyncLevel %u, Depth %u\n",
|
||
|
|
obj_desc->mutex.sync_level,
|
||
|
|
walk_state->thread->current_sync_level,
|
||
|
|
obj_desc->mutex.acquisition_depth));
|
||
|
|
|
||
|
|
return_ACPI_STATUS(status);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*******************************************************************************
|
||
|
|
*
|
||
|
|
* FUNCTION: acpi_ex_release_mutex_object
|
||
|
|
*
|
||
|
|
* PARAMETERS: obj_desc - The object descriptor for this op
|
||
|
|
*
|
||
|
|
* RETURN: Status
|
||
|
|
*
|
||
|
|
* DESCRIPTION: Release a previously acquired Mutex, low level interface.
|
||
|
|
* Provides a common path that supports multiple releases (after
|
||
|
|
* previous multiple acquires) by the same thread.
|
||
|
|
*
|
||
|
|
* MUTEX: Interpreter must be locked
|
||
|
|
*
|
||
|
|
* NOTE: This interface is called from three places:
|
||
|
|
* 1) From acpi_ex_release_mutex, via an AML Acquire() operator
|
||
|
|
* 2) From acpi_ex_release_global_lock when an AML Field access requires the
|
||
|
|
* global lock
|
||
|
|
* 3) From the external interface, acpi_release_global_lock
|
||
|
|
*
|
||
|
|
******************************************************************************/
|
||
|
|
|
||
|
|
acpi_status acpi_ex_release_mutex_object(union acpi_operand_object *obj_desc)
|
||
|
|
{
|
||
|
|
acpi_status status = AE_OK;
|
||
|
|
|
||
|
|
ACPI_FUNCTION_TRACE(ex_release_mutex_object);
|
||
|
|
|
||
|
|
if (obj_desc->mutex.acquisition_depth == 0) {
|
||
|
|
return_ACPI_STATUS(AE_NOT_ACQUIRED);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Match multiple Acquires with multiple Releases */
|
||
|
|
|
||
|
|
obj_desc->mutex.acquisition_depth--;
|
||
|
|
if (obj_desc->mutex.acquisition_depth != 0) {
|
||
|
|
|
||
|
|
/* Just decrement the depth and return */
|
||
|
|
|
||
|
|
return_ACPI_STATUS(AE_OK);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (obj_desc->mutex.owner_thread) {
|
||
|
|
|
||
|
|
/* Unlink the mutex from the owner's list */
|
||
|
|
|
||
|
|
acpi_ex_unlink_mutex(obj_desc);
|
||
|
|
obj_desc->mutex.owner_thread = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Release the mutex, special case for Global Lock */
|
||
|
|
|
||
|
|
if (obj_desc == acpi_gbl_global_lock_mutex) {
|
||
|
|
status = acpi_ev_release_global_lock();
|
||
|
|
} else {
|
||
|
|
acpi_os_release_mutex(obj_desc->mutex.os_mutex);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Clear mutex info */
|
||
|
|
|
||
|
|
obj_desc->mutex.thread_id = 0;
|
||
|
|
return_ACPI_STATUS(status);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*******************************************************************************
|
||
|
|
*
|
||
|
|
* FUNCTION: acpi_ex_release_mutex
|
||
|
|
*
|
||
|
|
* PARAMETERS: obj_desc - The object descriptor for this op
|
||
|
|
* walk_state - Current method execution state
|
||
|
|
*
|
||
|
|
* RETURN: Status
|
||
|
|
*
|
||
|
|
* DESCRIPTION: Release a previously acquired Mutex.
|
||
|
|
*
|
||
|
|
******************************************************************************/
|
||
|
|
|
||
|
|
acpi_status
|
||
|
|
acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
|
||
|
|
struct acpi_walk_state *walk_state)
|
||
|
|
{
|
||
|
|
u8 previous_sync_level;
|
||
|
|
struct acpi_thread_state *owner_thread;
|
||
|
|
acpi_status status = AE_OK;
|
||
|
|
|
||
|
|
ACPI_FUNCTION_TRACE(ex_release_mutex);
|
||
|
|
|
||
|
|
if (!obj_desc) {
|
||
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
||
|
|
}
|
||
|
|
|
||
|
|
owner_thread = obj_desc->mutex.owner_thread;
|
||
|
|
|
||
|
|
/* The mutex must have been previously acquired in order to release it */
|
||
|
|
|
||
|
|
if (!owner_thread) {
|
||
|
|
ACPI_ERROR((AE_INFO,
|
||
|
|
"Cannot release Mutex [%4.4s], not acquired",
|
||
|
|
acpi_ut_get_node_name(obj_desc->mutex.node)));
|
||
|
|
return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Must have a valid thread ID */
|
||
|
|
|
||
|
|
if (!walk_state->thread) {
|
||
|
|
ACPI_ERROR((AE_INFO,
|
||
|
|
"Cannot release Mutex [%4.4s], null thread info",
|
||
|
|
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 ((owner_thread->thread_id != walk_state->thread->thread_id) &&
|
||
|
|
(obj_desc != acpi_gbl_global_lock_mutex)) {
|
||
|
|
ACPI_ERROR((AE_INFO,
|
||
|
|
"Thread %u cannot release Mutex [%4.4s] acquired by thread %u",
|
||
|
|
(u32)walk_state->thread->thread_id,
|
||
|
|
acpi_ut_get_node_name(obj_desc->mutex.node),
|
||
|
|
(u32)owner_thread->thread_id));
|
||
|
|
return_ACPI_STATUS(AE_AML_NOT_OWNER);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The sync level of the mutex must be equal to the current sync level. In
|
||
|
|
* other words, the current level means that at least one mutex at that
|
||
|
|
* level is currently being held. Attempting to release a mutex of a
|
||
|
|
* different level can only mean that the mutex ordering rule is being
|
||
|
|
* violated. This behavior is clarified in ACPI 4.0 specification.
|
||
|
|
*/
|
||
|
|
if (obj_desc->mutex.sync_level != owner_thread->current_sync_level) {
|
||
|
|
ACPI_ERROR((AE_INFO,
|
||
|
|
"Cannot release Mutex [%4.4s], SyncLevel mismatch: "
|
||
|
|
"mutex %u current %u",
|
||
|
|
acpi_ut_get_node_name(obj_desc->mutex.node),
|
||
|
|
obj_desc->mutex.sync_level,
|
||
|
|
walk_state->thread->current_sync_level));
|
||
|
|
return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Get the previous sync_level from the head of the acquired mutex list.
|
||
|
|
* This handles the case where several mutexes at the same level have been
|
||
|
|
* acquired, but are not released in reverse order.
|
||
|
|
*/
|
||
|
|
previous_sync_level =
|
||
|
|
owner_thread->acquired_mutex_list->mutex.original_sync_level;
|
||
|
|
|
||
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
||
|
|
"Releasing: Object SyncLevel %u, Thread SyncLevel %u, "
|
||
|
|
"Prev SyncLevel %u, Depth %u TID %p\n",
|
||
|
|
obj_desc->mutex.sync_level,
|
||
|
|
walk_state->thread->current_sync_level,
|
||
|
|
previous_sync_level,
|
||
|
|
obj_desc->mutex.acquisition_depth,
|
||
|
|
walk_state->thread));
|
||
|
|
|
||
|
|
status = acpi_ex_release_mutex_object(obj_desc);
|
||
|
|
if (ACPI_FAILURE(status)) {
|
||
|
|
return_ACPI_STATUS(status);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (obj_desc->mutex.acquisition_depth == 0) {
|
||
|
|
|
||
|
|
/* Restore the previous sync_level */
|
||
|
|
|
||
|
|
owner_thread->current_sync_level = previous_sync_level;
|
||
|
|
}
|
||
|
|
|
||
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
||
|
|
"Released: Object SyncLevel %u, Thread SyncLevel, %u, "
|
||
|
|
"Prev SyncLevel %u, Depth %u\n",
|
||
|
|
obj_desc->mutex.sync_level,
|
||
|
|
walk_state->thread->current_sync_level,
|
||
|
|
previous_sync_level,
|
||
|
|
obj_desc->mutex.acquisition_depth));
|
||
|
|
|
||
|
|
return_ACPI_STATUS(status);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*******************************************************************************
|
||
|
|
*
|
||
|
|
* FUNCTION: acpi_ex_release_all_mutexes
|
||
|
|
*
|
||
|
|
* PARAMETERS: thread - Current executing thread object
|
||
|
|
*
|
||
|
|
* RETURN: Status
|
||
|
|
*
|
||
|
|
* DESCRIPTION: Release all mutexes held by this thread
|
||
|
|
*
|
||
|
|
* NOTE: This function is called as the thread is exiting the interpreter.
|
||
|
|
* Mutexes are not released when an individual control method is exited, but
|
||
|
|
* only when the parent thread actually exits the interpreter. This allows one
|
||
|
|
* method to acquire a mutex, and a different method to release it, as long as
|
||
|
|
* this is performed underneath a single parent control method.
|
||
|
|
*
|
||
|
|
******************************************************************************/
|
||
|
|
|
||
|
|
void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread)
|
||
|
|
{
|
||
|
|
union acpi_operand_object *next = thread->acquired_mutex_list;
|
||
|
|
union acpi_operand_object *obj_desc;
|
||
|
|
|
||
|
|
ACPI_FUNCTION_TRACE(ex_release_all_mutexes);
|
||
|
|
|
||
|
|
/* Traverse the list of owned mutexes, releasing each one */
|
||
|
|
|
||
|
|
while (next) {
|
||
|
|
obj_desc = next;
|
||
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
||
|
|
"Mutex [%4.4s] force-release, SyncLevel %u Depth %u\n",
|
||
|
|
obj_desc->mutex.node->name.ascii,
|
||
|
|
obj_desc->mutex.sync_level,
|
||
|
|
obj_desc->mutex.acquisition_depth));
|
||
|
|
|
||
|
|
/* Release the mutex, special case for Global Lock */
|
||
|
|
|
||
|
|
if (obj_desc == acpi_gbl_global_lock_mutex) {
|
||
|
|
|
||
|
|
/* Ignore errors */
|
||
|
|
|
||
|
|
(void)acpi_ev_release_global_lock();
|
||
|
|
} else {
|
||
|
|
acpi_os_release_mutex(obj_desc->mutex.os_mutex);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Update Thread sync_level (Last mutex is the important one) */
|
||
|
|
|
||
|
|
thread->current_sync_level =
|
||
|
|
obj_desc->mutex.original_sync_level;
|
||
|
|
|
||
|
|
/* Mark mutex unowned */
|
||
|
|
|
||
|
|
next = obj_desc->mutex.next;
|
||
|
|
|
||
|
|
obj_desc->mutex.prev = NULL;
|
||
|
|
obj_desc->mutex.next = NULL;
|
||
|
|
obj_desc->mutex.acquisition_depth = 0;
|
||
|
|
obj_desc->mutex.owner_thread = NULL;
|
||
|
|
obj_desc->mutex.thread_id = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return_VOID;
|
||
|
|
}
|