Example #1
0
/*******************************************************************************
 *
 * FUNCTION:    acpi_release_global_lock
 *
 * PARAMETERS:  Handle      - Returned from acpi_acquire_global_lock
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
 *
 ******************************************************************************/
acpi_status acpi_release_global_lock(u32 handle)
{
	acpi_status status;

	if (!handle || (handle != acpi_gbl_global_lock_handle)) {
		return (AE_NOT_ACQUIRED);
	}

	status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
	return (status);
}
Example #2
0
File: exmutex.c Project: E-LLP/n900
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);
	}

	/*
	 * 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 != 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);
	}

	/* 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 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], SyncLevel mismatch: mutex %d current %d",
			    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);
	}

	status = acpi_ex_release_mutex_object(obj_desc);

	if (obj_desc->mutex.acquisition_depth == 0) {

		/* Restore the original sync_level */

		walk_state->thread->current_sync_level =
		    obj_desc->mutex.original_sync_level;
	}
	return_ACPI_STATUS(status);
}
Example #3
0
acpi_status
acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
		      struct acpi_walk_state *walk_state)
{
	acpi_status status = AE_OK;
	u8 previous_sync_level;
	struct acpi_thread_state *owner_thread;

	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. */
	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;

	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;
	}

	return_ACPI_STATUS(status);
}