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Commit fb49f204 authored by Shuah Khan's avatar Shuah Khan Committed by Mauro Carvalho Chehab
Browse files

[media] media: Media Controller non-locking __media_entity_pipeline_start/stop() 



Add non-locking __media_entity_pipeline_start/stop()
interfaces to be called from code paths that hold the
graph_mutex.

Signed-off-by: default avatarShuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent efc70278

drivers/media/media-entity.c

+24 −10
Original line number Diff line number Diff line
@@ -366,7 +366,7 @@ EXPORT_SYMBOL_GPL(media_entity_graph_walk_next); 
 * Pipeline management

 */



__must_check int media_entity_pipeline_start(struct media_entity *entity,

__must_check int __media_entity_pipeline_start(struct media_entity *entity,

					       struct media_pipeline *pipe)

{

	struct media_device *mdev = entity->graph_obj.mdev;
@@ -375,8 +375,6 @@ __must_check int media_entity_pipeline_start(struct media_entity *entity, 
	struct media_link *link;

	int ret;



	mutex_lock(&mdev->graph_mutex);



	if (!pipe->streaming_count++) {

		ret = media_entity_graph_walk_init(&pipe->graph, mdev);

		if (ret)
@@ -457,8 +455,6 @@ __must_check int media_entity_pipeline_start(struct media_entity *entity, 
		}

	}



	mutex_unlock(&mdev->graph_mutex);



	return 0;



error:
@@ -488,19 +484,28 @@ __must_check int media_entity_pipeline_start(struct media_entity *entity, 
	if (!--pipe->streaming_count)

		media_entity_graph_walk_cleanup(graph);



	mutex_unlock(&mdev->graph_mutex);

	return ret;

}

EXPORT_SYMBOL_GPL(__media_entity_pipeline_start);



__must_check int media_entity_pipeline_start(struct media_entity *entity,

					     struct media_pipeline *pipe)

{

	struct media_device *mdev = entity->graph_obj.mdev;

	int ret;



	mutex_lock(&mdev->graph_mutex);

	ret = __media_entity_pipeline_start(entity, pipe);

	mutex_unlock(&mdev->graph_mutex);

	return ret;

}

EXPORT_SYMBOL_GPL(media_entity_pipeline_start);



void media_entity_pipeline_stop(struct media_entity *entity)

void __media_entity_pipeline_stop(struct media_entity *entity)

{

	struct media_device *mdev = entity->graph_obj.mdev;

	struct media_entity_graph *graph = &entity->pipe->graph;

	struct media_pipeline *pipe = entity->pipe;



	mutex_lock(&mdev->graph_mutex);



	WARN_ON(!pipe->streaming_count);

	media_entity_graph_walk_start(graph, entity);
@@ -517,6 +522,15 @@ void media_entity_pipeline_stop(struct media_entity *entity) 
	if (!--pipe->streaming_count)

		media_entity_graph_walk_cleanup(graph);



}

EXPORT_SYMBOL_GPL(__media_entity_pipeline_stop);



void media_entity_pipeline_stop(struct media_entity *entity)

{

	struct media_device *mdev = entity->graph_obj.mdev;



	mutex_lock(&mdev->graph_mutex);

	__media_entity_pipeline_stop(entity);

	mutex_unlock(&mdev->graph_mutex);

}

EXPORT_SYMBOL_GPL(media_entity_pipeline_stop);

include/media/media-entity.h

+19 −0
Original line number Diff line number Diff line
@@ -832,6 +832,16 @@ media_entity_graph_walk_next(struct media_entity_graph *graph); 
 */

__must_check int media_entity_pipeline_start(struct media_entity *entity,

					     struct media_pipeline *pipe);

/**

 * __media_entity_pipeline_start - Mark a pipeline as streaming

 *

 * @entity: Starting entity

 * @pipe: Media pipeline to be assigned to all entities in the pipeline.

 *

 * Note: This is the non-locking version of media_entity_pipeline_start()

 */

__must_check int __media_entity_pipeline_start(struct media_entity *entity,

					       struct media_pipeline *pipe);



/**

 * media_entity_pipeline_stop - Mark a pipeline as not streaming
@@ -847,6 +857,15 @@ __must_check int media_entity_pipeline_start(struct media_entity *entity, 
 */

void media_entity_pipeline_stop(struct media_entity *entity);



/**

 * __media_entity_pipeline_stop - Mark a pipeline as not streaming

 *

 * @entity: Starting entity

 *

 * Note: This is the non-locking version of media_entity_pipeline_stop()

 */

void __media_entity_pipeline_stop(struct media_entity *entity);



/**

 * media_devnode_create() - creates and initializes a device node interface

 *