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authorKieran Bingham <kieran.bingham+renesas@ideasonboard.com>2017-01-03 13:12:11 (GMT)
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-06-23 12:23:36 (GMT)
commit2a2599c663684a1142dae0bff7737e125891ae6d (patch)
treeeda500933adb576aa67adc23fb3eb83150ff3588
parent8780f1d9d696c7f466a0ff2a2016476a7ebf42b6 (diff)
[media] media: entity: Catch unbalanced media_pipeline_stop callsmedia/v4.13-1
Drivers must not perform unbalanced calls to stop the entity pipeline, however if they do they will fault in the core media code, as the entity->pipe will be set as NULL. We handle this gracefully in the core with a WARN for the developer. Replace the erroneous check on zero streaming counts, with a check on NULL pipe elements instead, as this is the symptom of unbalanced media_pipeline_stop calls. Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pincharts@ideasonboard.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
-rw-r--r--drivers/media/media-entity.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
index 82d6755..dd0f0ea 100644
--- a/drivers/media/media-entity.c
+++ b/drivers/media/media-entity.c
@@ -566,8 +566,13 @@ void __media_pipeline_stop(struct media_entity *entity)
struct media_graph *graph = &entity->pipe->graph;
struct media_pipeline *pipe = entity->pipe;
+ /*
+ * If the following check fails, the driver has performed an
+ * unbalanced call to media_pipeline_stop()
+ */
+ if (WARN_ON(!pipe))
+ return;
- WARN_ON(!pipe->streaming_count);
media_graph_walk_start(graph, entity);
while ((entity = media_graph_walk_next(graph))) {

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