[deliverable/linux.git] / drivers / acpi / executer / exmutex.c


/******************************************************************************
 *
 * Module Name: exmutex - ASL Mutex Acquire/Release functions
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2006, R. Byron Moore
 * 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 <acpi/acinterp.h>
#include <acpi/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;
	} 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
 *
 * 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);
	}

	/* Sanity check: we must have a valid thread ID */

	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 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 (%d)",
			    acpi_ut_get_node_name(obj_desc->mutex.node),
			    walk_state->thread->current_sync_level));
		return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
	}

	/* Support for multiple acquires by the owning thread */

	if (obj_desc->mutex.owner_thread) {
		if (obj_desc->mutex.owner_thread->thread_id ==
		    walk_state->thread->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->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
		status =
		    acpi_ev_acquire_global_lock((u16) time_desc->integer.value);
	} else {
		status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
						   (u16) time_desc->integer.
						   value);
	}

	if (ACPI_FAILURE(status)) {

		/* Includes failure from a timeout on time_desc */

		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.acquisition_depth = 1;
	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);
	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
 *
 * DESCRIPTION: Release a previously acquired Mutex.
 *
 ******************************************************************************/

acpi_status
acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
		      struct acpi_walk_state *walk_state)
{
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(ex_release_mutex);

	if (!obj_desc) {
		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_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);
	}

	/* Sanity check: we 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 ((obj_desc->mutex.owner_thread->thread_id !=
	     walk_state->thread->thread_id)
	    && (obj_desc->mutex.os_mutex != acpi_gbl_global_lock_mutex)) {
		ACPI_ERROR((AE_INFO,
			    "Thread %lX cannot release Mutex [%4.4s] acquired by thread %lX",
			    (unsigned long)walk_state->thread->thread_id,
			    acpi_ut_get_node_name(obj_desc->mutex.node),
			    (unsigned long)obj_desc->mutex.owner_thread->thread_id));
		return_ACPI_STATUS(AE_AML_NOT_OWNER);
	}

	/*
	 * The sync level of the mutex must be less than or equal to the current
	 * sync level
	 */
	if (obj_desc->mutex.sync_level > walk_state->thread->current_sync_level) {
		ACPI_ERROR((AE_INFO,
			    "Cannot release Mutex [%4.4s], incorrect SyncLevel",
			    acpi_ut_get_node_name(obj_desc->mutex.node)));
		return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
	}

	/* 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);
	}

	/* Unlink the mutex from the owner's list */

	acpi_ex_unlink_mutex(obj_desc);

	/* Release the mutex, special case for Global Lock */

	if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
		status = acpi_ev_release_global_lock();
	} else {
		acpi_os_release_mutex(obj_desc->mutex.os_mutex);
	}

	/* Update the mutex and restore sync_level */

	obj_desc->mutex.owner_thread = NULL;
	walk_state->thread->current_sync_level =
	    obj_desc->mutex.original_sync_level;

	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
 *
 ******************************************************************************/

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_ENTRY();

	/* Traverse the list of owned mutexes, releasing each one */

	while (next) {
		obj_desc = next;
		next = obj_desc->mutex.next;

		obj_desc->mutex.prev = NULL;
		obj_desc->mutex.next = NULL;
		obj_desc->mutex.acquisition_depth = 1;

		/* Release the mutex, special case for Global Lock */

		if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {

			/* Ignore errors */

			(void)acpi_ev_release_global_lock();
		} else {
			acpi_os_release_mutex(obj_desc->mutex.os_mutex);
		}

		/* Mark mutex unowned */

		obj_desc->mutex.owner_thread = NULL;

		/* Update Thread sync_level (Last mutex is the important one) */

		thread->current_sync_level =
		    obj_desc->mutex.original_sync_level;
	}
}
Commit	Line	Data
1da177e4 LT	1
	2	/******************************************************************************
	3	*
	4	* Module Name: exmutex - ASL Mutex Acquire/Release functions
	5	*
	6	*****************************************************************************/
	7
	8	/*
4a90c7e8	9	* Copyright (C) 2000 - 2006, R. Byron Moore
1da177e4 LT	10	* All rights reserved.
	11	*
	12	* Redistribution and use in source and binary forms, with or without
	13	* modification, are permitted provided that the following conditions
	14	* are met:
	15	* 1. Redistributions of source code must retain the above copyright
	16	* notice, this list of conditions, and the following disclaimer,
	17	* without modification.
	18	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	19	* substantially similar to the "NO WARRANTY" disclaimer below
	20	* ("Disclaimer") and any redistribution must be conditioned upon
	21	* including a substantially similar Disclaimer requirement for further
	22	* binary redistribution.
	23	* 3. Neither the names of the above-listed copyright holders nor the names
	24	* of any contributors may be used to endorse or promote products derived
	25	* from this software without specific prior written permission.
	26	*
	27	* Alternatively, this software may be distributed under the terms of the
	28	* GNU General Public License ("GPL") version 2 as published by the Free
	29	* Software Foundation.
	30	*
	31	* NO WARRANTY
	32	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	33	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	34	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	35	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	36	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	37	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	38	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	39	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	40	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	41	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	42	* POSSIBILITY OF SUCH DAMAGES.
	43	*/
	44
1da177e4 LT	45	#include <acpi/acpi.h>
1da177e4 LT	46	#include <acpi/acinterp.h>
c81da666	47	#include <acpi/acevents.h>
1da177e4 LT	48
1da177e4 LT	49	#define _COMPONENT ACPI_EXECUTER
4be44fcd	50	ACPI_MODULE_NAME("exmutex")
1da177e4	51
44f6c012	52	/* Local prototypes */
44f6c012	53	static void
4be44fcd LB	54	acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
4be44fcd LB	55	struct acpi_thread_state *thread);
1da177e4 LT	56
	57	/*******************************************************************************
	58	*
	59	* FUNCTION: acpi_ex_unlink_mutex
	60	*
	61	* PARAMETERS: obj_desc - The mutex to be unlinked
	62	*
44f6c012	63	* RETURN: None
1da177e4	64	*
b229cf92	65	* DESCRIPTION: Remove a mutex from the "AcquiredMutex" list
1da177e4 LT	66	*
	67	******************************************************************************/
	68
4be44fcd	69	void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc)
1da177e4	70	{
4be44fcd	71	struct acpi_thread_state *thread = obj_desc->mutex.owner_thread;
1da177e4 LT	72
	73	if (!thread) {
	74	return;
	75	}
	76
	77	/* Doubly linked list */
	78
	79	if (obj_desc->mutex.next) {
	80	(obj_desc->mutex.next)->mutex.prev = obj_desc->mutex.prev;
	81	}
	82
	83	if (obj_desc->mutex.prev) {
	84	(obj_desc->mutex.prev)->mutex.next = obj_desc->mutex.next;
4be44fcd	85	} else {
1da177e4 LT	86	thread->acquired_mutex_list = obj_desc->mutex.next;
	87	}
	88	}
	89
1da177e4 LT	90	/*******************************************************************************
	91	*
	92	* FUNCTION: acpi_ex_link_mutex
	93	*
44f6c012 RM	94	* PARAMETERS: obj_desc - The mutex to be linked
44f6c012 RM	95	* Thread - Current executing thread object
1da177e4	96	*
44f6c012	97	* RETURN: None
1da177e4	98	*
b229cf92	99	* DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk
1da177e4 LT	100	*
	101	******************************************************************************/
	102
44f6c012	103	static void
4be44fcd LB	104	acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
4be44fcd LB	105	struct acpi_thread_state *thread)
1da177e4	106	{
4be44fcd	107	union acpi_operand_object *list_head;
1da177e4 LT	108
	109	list_head = thread->acquired_mutex_list;
	110
	111	/* This object will be the first object in the list */
	112
	113	obj_desc->mutex.prev = NULL;
	114	obj_desc->mutex.next = list_head;
	115
	116	/* Update old first object to point back to this object */
	117
	118	if (list_head) {
	119	list_head->mutex.prev = obj_desc;
	120	}
	121
	122	/* Update list head */
	123
	124	thread->acquired_mutex_list = obj_desc;
	125	}
	126
1da177e4 LT	127	/*******************************************************************************
	128	*
	129	* FUNCTION: acpi_ex_acquire_mutex
	130	*
44f6c012 RM	131	* PARAMETERS: time_desc - Timeout integer
	132	* obj_desc - Mutex object
	133	* walk_state - Current method execution state
1da177e4 LT	134	*
	135	* RETURN: Status
	136	*
	137	* DESCRIPTION: Acquire an AML mutex
	138	*
	139	******************************************************************************/
	140
	141	acpi_status
4be44fcd LB	142	acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
	143	union acpi_operand_object *obj_desc,
	144	struct acpi_walk_state *walk_state)
1da177e4	145	{
4be44fcd	146	acpi_status status;
1da177e4	147
b229cf92	148	ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex, obj_desc);
1da177e4 LT	149
1da177e4 LT	150	if (!obj_desc) {
4be44fcd	151	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	152	}
1da177e4 LT	153
c81da666	154	/* Sanity check: we must have a valid thread ID */
1da177e4 LT	155
1da177e4 LT	156	if (!walk_state->thread) {
b8e4d893 BM	157	ACPI_ERROR((AE_INFO,
	158	"Cannot acquire Mutex [%4.4s], null thread info",
	159	acpi_ut_get_node_name(obj_desc->mutex.node)));
4be44fcd	160	return_ACPI_STATUS(AE_AML_INTERNAL);
1da177e4 LT	161	}
	162
	163	/*
	164	* Current Sync must be less than or equal to the sync level of the
967440e3	165	* mutex. This mechanism provides some deadlock prevention
1da177e4 LT	166	*/
1da177e4 LT	167	if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) {
b8e4d893	168	ACPI_ERROR((AE_INFO,
967440e3 BM	169	"Cannot acquire Mutex [%4.4s], current SyncLevel is too large (%d)",
	170	acpi_ut_get_node_name(obj_desc->mutex.node),
	171	walk_state->thread->current_sync_level));
4be44fcd	172	return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
1da177e4 LT	173	}
	174
	175	/* Support for multiple acquires by the owning thread */
	176
	177	if (obj_desc->mutex.owner_thread) {
c81da666 BM	178	if (obj_desc->mutex.owner_thread->thread_id ==
c81da666 BM	179	walk_state->thread->thread_id) {
1da177e4	180	/*
c81da666 BM	181	* The mutex is already owned by this thread, just increment the
c81da666 BM	182	* acquisition depth
1da177e4 LT	183	*/
1da177e4 LT	184	obj_desc->mutex.acquisition_depth++;
4be44fcd	185	return_ACPI_STATUS(AE_OK);
1da177e4 LT	186	}
	187	}
	188
c81da666 BM	189	/* Acquire the mutex, wait if necessary. Special case for Global Lock */
	190
	191	if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
	192	status =
	193	acpi_ev_acquire_global_lock((u16) time_desc->integer.value);
	194	} else {
	195	status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
	196	(u16) time_desc->integer.
	197	value);
	198	}
1da177e4	199
4be44fcd	200	if (ACPI_FAILURE(status)) {
52fc0b02	201
1da177e4 LT	202	/* Includes failure from a timeout on time_desc */
1da177e4 LT	203
4be44fcd	204	return_ACPI_STATUS(status);
1da177e4 LT	205	}
	206
	207	/* Have the mutex: update mutex and walk info and save the sync_level */
	208
4be44fcd	209	obj_desc->mutex.owner_thread = walk_state->thread;
1da177e4	210	obj_desc->mutex.acquisition_depth = 1;
4be44fcd LB	211	obj_desc->mutex.original_sync_level =
4be44fcd LB	212	walk_state->thread->current_sync_level;
1da177e4 LT	213
	214	walk_state->thread->current_sync_level = obj_desc->mutex.sync_level;
	215
	216	/* Link the mutex to the current thread for force-unlock at method exit */
	217
4be44fcd	218	acpi_ex_link_mutex(obj_desc, walk_state->thread);
4be44fcd	219	return_ACPI_STATUS(AE_OK);
1da177e4 LT	220	}
1da177e4 LT	221
1da177e4 LT	222	/*******************************************************************************
	223	*
	224	* FUNCTION: acpi_ex_release_mutex
	225	*
	226	* PARAMETERS: obj_desc - The object descriptor for this op
44f6c012	227	* walk_state - Current method execution state
1da177e4 LT	228	*
	229	* RETURN: Status
	230	*
	231	* DESCRIPTION: Release a previously acquired Mutex.
	232	*
	233	******************************************************************************/
	234
	235	acpi_status
4be44fcd LB	236	acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
4be44fcd LB	237	struct acpi_walk_state *walk_state)
1da177e4	238	{
c81da666	239	acpi_status status = AE_OK;
1da177e4	240
b229cf92	241	ACPI_FUNCTION_TRACE(ex_release_mutex);
1da177e4 LT	242
1da177e4 LT	243	if (!obj_desc) {
4be44fcd	244	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	245	}
	246
	247	/* The mutex must have been previously acquired in order to release it */
	248
	249	if (!obj_desc->mutex.owner_thread) {
b8e4d893 BM	250	ACPI_ERROR((AE_INFO,
	251	"Cannot release Mutex [%4.4s], not acquired",
	252	acpi_ut_get_node_name(obj_desc->mutex.node)));
4be44fcd	253	return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED);
1da177e4 LT	254	}
1da177e4 LT	255
c81da666	256	/* Sanity check: we must have a valid thread ID */
1da177e4 LT	257
1da177e4 LT	258	if (!walk_state->thread) {
b8e4d893 BM	259	ACPI_ERROR((AE_INFO,
	260	"Cannot release Mutex [%4.4s], null thread info",
	261	acpi_ut_get_node_name(obj_desc->mutex.node)));
4be44fcd	262	return_ACPI_STATUS(AE_AML_INTERNAL);
1da177e4 LT	263	}
	264
	265	/*
	266	* The Mutex is owned, but this thread must be the owner.
	267	* Special case for Global Lock, any thread can release
	268	*/
4be44fcd LB	269	if ((obj_desc->mutex.owner_thread->thread_id !=
4be44fcd LB	270	walk_state->thread->thread_id)
c81da666	271	&& (obj_desc->mutex.os_mutex != acpi_gbl_global_lock_mutex)) {
b8e4d893	272	ACPI_ERROR((AE_INFO,
965a3d44 MB	273	"Thread %lX cannot release Mutex [%4.4s] acquired by thread %lX",
965a3d44 MB	274	(unsigned long)walk_state->thread->thread_id,
b8e4d893	275	acpi_ut_get_node_name(obj_desc->mutex.node),
965a3d44	276	(unsigned long)obj_desc->mutex.owner_thread->thread_id));
4be44fcd	277	return_ACPI_STATUS(AE_AML_NOT_OWNER);
1da177e4 LT	278	}
	279
	280	/*
c81da666 BM	281	* The sync level of the mutex must be less than or equal to the current
c81da666 BM	282	* sync level
1da177e4 LT	283	*/
1da177e4 LT	284	if (obj_desc->mutex.sync_level > walk_state->thread->current_sync_level) {
b8e4d893	285	ACPI_ERROR((AE_INFO,
b229cf92	286	"Cannot release Mutex [%4.4s], incorrect SyncLevel",
b8e4d893	287	acpi_ut_get_node_name(obj_desc->mutex.node)));
4be44fcd	288	return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
1da177e4 LT	289	}
	290
	291	/* Match multiple Acquires with multiple Releases */
	292
	293	obj_desc->mutex.acquisition_depth--;
	294	if (obj_desc->mutex.acquisition_depth != 0) {
52fc0b02	295
1da177e4 LT	296	/* Just decrement the depth and return */
1da177e4 LT	297
4be44fcd	298	return_ACPI_STATUS(AE_OK);
1da177e4 LT	299	}
	300
	301	/* Unlink the mutex from the owner's list */
	302
4be44fcd	303	acpi_ex_unlink_mutex(obj_desc);
1da177e4	304
c81da666	305	/* Release the mutex, special case for Global Lock */
1da177e4	306
c81da666 BM	307	if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
	308	status = acpi_ev_release_global_lock();
	309	} else {
	310	acpi_os_release_mutex(obj_desc->mutex.os_mutex);
	311	}
1da177e4	312
c81da666	313	/* Update the mutex and restore sync_level */
1da177e4 LT	314
1da177e4 LT	315	obj_desc->mutex.owner_thread = NULL;
4be44fcd LB	316	walk_state->thread->current_sync_level =
4be44fcd LB	317	obj_desc->mutex.original_sync_level;
1da177e4	318
4be44fcd	319	return_ACPI_STATUS(status);
1da177e4 LT	320	}
1da177e4 LT	321
1da177e4 LT	322	/*******************************************************************************
	323	*
	324	* FUNCTION: acpi_ex_release_all_mutexes
	325	*
44f6c012	326	* PARAMETERS: Thread - Current executing thread object
1da177e4 LT	327	*
	328	* RETURN: Status
	329	*
44f6c012	330	* DESCRIPTION: Release all mutexes held by this thread
1da177e4 LT	331	*
	332	******************************************************************************/
	333
4be44fcd	334	void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread)
1da177e4	335	{
4be44fcd	336	union acpi_operand_object *next = thread->acquired_mutex_list;
c81da666	337	union acpi_operand_object *obj_desc;
1da177e4	338
4be44fcd	339	ACPI_FUNCTION_ENTRY();
1da177e4 LT	340
	341	/* Traverse the list of owned mutexes, releasing each one */
	342
	343	while (next) {
c81da666 BM	344	obj_desc = next;
	345	next = obj_desc->mutex.next;
	346
	347	obj_desc->mutex.prev = NULL;
	348	obj_desc->mutex.next = NULL;
	349	obj_desc->mutex.acquisition_depth = 1;
	350
	351	/* Release the mutex, special case for Global Lock */
1da177e4	352
c81da666	353	if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
1da177e4	354
c81da666	355	/* Ignore errors */
1da177e4	356
c81da666 BM	357	(void)acpi_ev_release_global_lock();
	358	} else {
	359	acpi_os_release_mutex(obj_desc->mutex.os_mutex);
1da177e4 LT	360	}
	361
	362	/* Mark mutex unowned */
	363
c81da666	364	obj_desc->mutex.owner_thread = NULL;
1da177e4 LT	365
	366	/* Update Thread sync_level (Last mutex is the important one) */
	367
c81da666 BM	368	thread->current_sync_level =
c81da666 BM	369	obj_desc->mutex.original_sync_level;
1da177e4 LT	370	}
1da177e4 LT	371	}