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| author |   Sakari Ailus <sakari.ailus@iki.fi> | 2015-12-16 11:32:22 -0200 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2016-01-11 12:19:18 -0200 |
| commit | e03d220336dd69292370393f5eee98ac17eda308 (patch) | |
| tree | 2815c164379aca3f8b937a5c44d3799b6b5d2f7d /include/media/media-entity.h | |
| parent | [media] media: Move media graph state for streamon/off to the pipeline (diff) | |
| download | wireguard-linux-e03d220336dd69292370393f5eee98ac17eda308.tar.xz wireguard-linux-e03d220336dd69292370393f5eee98ac17eda308.zip | |
[media] media: Amend media graph walk API by init and cleanup functions
Add media_entity_graph_walk_init() and media_entity_graph_walk_cleanup()
functions in order to dynamically allocate memory for the graph. This is
not done in media_entity_graph_walk_start() as there are situations where
e.g. correct error handling, that itself may not fail, requires successful
graph walk.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'include/media/media-entity.h')
| -rw-r--r-- | include/media/media-entity.h | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/include/media/media-entity.h b/include/media/media-entity.h index 4dc3bef72c9d..7f028ea84911 100644 --- a/include/media/media-entity.h +++ b/include/media/media-entity.h @@ -699,6 +699,10 @@ struct media_pad *media_entity_remote_pad(struct media_pad *pad); */ struct media_entity *media_entity_get(struct media_entity *entity); +__must_check int media_entity_graph_walk_init( + struct media_entity_graph *graph, struct media_device *mdev); +void media_entity_graph_walk_cleanup(struct media_entity_graph *graph); + /** * media_entity_put - Release the reference to the parent module * @@ -715,13 +719,16 @@ void media_entity_put(struct media_entity *entity); * @graph: Media graph structure that will be used to walk the graph * @entity: Starting entity * - * This function initializes the graph traversal structure to walk the entities - * graph starting at the given entity. The traversal structure must not be - * modified by the caller during graph traversal. When done the structure can - * safely be freed. + * Before using this function, media_entity_graph_walk_init() must be + * used to allocate resources used for walking the graph. This + * function initializes the graph traversal structure to walk the + * entities graph starting at the given entity. The traversal + * structure must not be modified by the caller during graph + * traversal. After the graph walk, the resources must be released + * using media_entity_graph_walk_cleanup(). */ void media_entity_graph_walk_start(struct media_entity_graph *graph, - struct media_entity *entity); + struct media_entity *entity); /** * media_entity_graph_walk_next - Get the next entity in the graph |