Em Sun, 29 Nov 2015 21:20:15 +0200
Sakari Ailus <sakari.ai...@iki.fi> escreveu:
> Initialise a given graph walk object once, and then keep using it whilst
> the same pipeline is running. Once the pipeline is stopped, release the
> graph walk object.
>
> Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
> ---
> drivers/media/media-entity.c | 17 +++++++++++------
> include/media/media-entity.h | 4 +++-
> 2 files changed, 14 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
> index 7429c03..137aa09d 100644
> --- a/drivers/media/media-entity.c
> +++ b/drivers/media/media-entity.c
> @@ -488,10 +488,10 @@ __must_check int media_entity_pipeline_start(struct
> media_entity *entity,
>
> mutex_lock(&mdev->graph_mutex);
>
> - ret = media_entity_graph_walk_init(&pipe->graph, mdev);
> - if (ret) {
> - mutex_unlock(&mdev->graph_mutex);
> - return ret;
> + if (!pipe->streaming_count++) {
> + ret = media_entity_graph_walk_init(&pipe->graph, mdev);
> + if (ret)
> + goto error_graph_walk_start;
> }
>
> media_entity_graph_walk_start(&pipe->graph, entity);
> @@ -592,7 +592,9 @@ error:
> break;
> }
>
> - media_entity_graph_walk_cleanup(graph);
> +error_graph_walk_start:
> + if (!--pipe->streaming_count)
> + media_entity_graph_walk_cleanup(graph);
>
> mutex_unlock(&mdev->graph_mutex);
>
> @@ -616,9 +618,11 @@ 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);
>
> + BUG_ON(!pipe->streaming_count);
Cant it be replaced by a WARN_ON()?
> media_entity_graph_walk_start(graph, entity);
>
> while ((entity = media_entity_graph_walk_next(graph))) {
> @@ -627,7 +631,8 @@ void media_entity_pipeline_stop(struct media_entity
> *entity)
> entity->pipe = NULL;
> }
>
> - media_entity_graph_walk_cleanup(graph);
> + if (!--pipe->streaming_count)
> + media_entity_graph_walk_cleanup(graph);
>
> mutex_unlock(&mdev->graph_mutex);
> }
> diff --git a/include/media/media-entity.h b/include/media/media-entity.h
> index 8122736..85c2656 100644
> --- a/include/media/media-entity.h
> +++ b/include/media/media-entity.h
> @@ -116,9 +116,11 @@ struct media_entity_graph {
> /*
> * struct media_pipeline - Media pipeline related information
> *
> - * @graph: Media graph walk during pipeline start / stop
> + * @streaming_count: Streaming start count - streaming stop count
> + * @graph: Media graph walk during pipeline start / stop
> */
> struct media_pipeline {
> + int streaming_count;
> struct media_entity_graph graph;
> };
>
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