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authorSakari Ailus <sakari.ailus@iki.fi>2015-12-16 11:32:22 -0200
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2016-01-11 12:19:18 -0200
commite03d220336dd69292370393f5eee98ac17eda308 (patch)
tree2815c164379aca3f8b937a5c44d3799b6b5d2f7d /drivers/media/media-entity.c
parent5dd8775dc6b480f67be11108d7cd798fba724cab (diff)
download96b-common-e03d220336dd69292370393f5eee98ac17eda308.tar.gz
[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/media/media-entity.c')
-rw-r--r--drivers/media/media-entity.c27
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)
{