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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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27
drivers/media/media-entity.c
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@ -282,6 +282,33 @@ static struct media_entity *stack_pop(struct media_entity_graph *graph)
#define link_top(en) ((en)->stack[(en)->top].link)
#define stack_top(en) ((en)->stack[(en)->top].entity)
/**
* media_entity_graph_walk_init - Allocate resources for graph walk
* @graph: Media graph structure that will be used to walk the graph
* @mdev: Media device
*
* Reserve resources for graph walk in media device's current
* state. The memory must be released using
* media_entity_graph_walk_free().
*
* Returns error on failure, zero on success.
*/
__must_check int media_entity_graph_walk_init(
struct media_entity_graph *graph, struct media_device *mdev)
{
return 0;
}
EXPORT_SYMBOL_GPL(media_entity_graph_walk_init);
/**
* media_entity_graph_walk_cleanup - Release resources related to graph walking
* @graph: Media graph structure that was used to walk the graph
*/
void media_entity_graph_walk_cleanup(struct media_entity_graph *graph)
{
}
EXPORT_SYMBOL_GPL(media_entity_graph_walk_cleanup);
void media_entity_graph_walk_start(struct media_entity_graph *graph,
struct media_entity *entity)
{