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| author | Sakari Ailus <sakari.ailus@iki.fi> | 2015-12-16 14:32:22 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2016-01-11 15:19:18 +0100 |
| commit | e03d220336dd69292370393f5eee98ac17eda308 (patch) | |
| tree | 2815c164379aca3f8b937a5c44d3799b6b5d2f7d /drivers | |
| parent | [media] media: Move media graph state for streamon/off to the pipeline (diff) | |
| download | linux-e03d220336dd69292370393f5eee98ac17eda308.tar.xz 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 'drivers')
| -rw-r--r-- | drivers/media/media-entity.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c index 83cfde6dcb1c..9bf96c71374e 100644 --- a/drivers/media/media-entity.c +++ b/drivers/media/media-entity.c @@ -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) { |