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[media] media: Amend media graph walk API by init and cleanup functions

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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 <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Sakari Ailus 2015-12-16 11:32:22 -02:00 • committed by Mauro Carvalho Chehab
commit e03d220336
2 changed files with 39 additions and 5 deletions
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17
include/media/media-entity.h
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@ -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