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[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: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
steinar/wifi_calib_4_9_kernel
Shuah Khan 2016-02-11 21:41:24 -02:00 committed by Mauro Carvalho Chehab
parent efc702784f
commit fb49f20438
2 changed files with 43 additions and 10 deletions
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34
drivers/media/media-entity.c
View File

@ -366,8 +366,8 @@ EXPORT_SYMBOL_GPL(media_entity_graph_walk_next);
* Pipeline management
*/
__must_check int media_entity_pipeline_start(struct media_entity *entity,
struct media_pipeline *pipe)
__must_check int __media_entity_pipeline_start(struct media_entity *entity,
struct media_pipeline *pipe)
{
struct media_device *mdev = entity->graph_obj.mdev;
struct media_entity_graph *graph = &pipe->graph;
@ -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 @@ error_graph_walk_start:
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);

19
include/media/media-entity.h
View File

@ -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
*