[media] media: Media Controller fix to not let stream_count go negative

Change media_entity_pipeline_stop() to not decrement
stream_count of an inactive media pipeline. Doing so,
results in preventing starting the pipeline.

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
index e89d85a7d31b56286a6d8c9d492b5565dc6a4d43..f2e43603d6d24f6a3c27105369187a73d61d8175 100644 (file)
--- a/drivers/media/media-entity.c
+++ b/drivers/media/media-entity.c
@@ -452,9 +452,12 @@ error:
        media_entity_graph_walk_start(graph, entity_err);
 
        while ((entity_err = media_entity_graph_walk_next(graph))) {
-               entity_err->stream_count--;
-               if (entity_err->stream_count == 0)
-                       entity_err->pipe = NULL;
+               /* don't let the stream_count go negative */
+               if (entity->stream_count > 0) {
+                       entity_err->stream_count--;
+                       if (entity_err->stream_count == 0)
+                               entity_err->pipe = NULL;
+               }
 
                /*
                 * We haven't increased stream_count further than this
@@ -486,9 +489,12 @@ void media_entity_pipeline_stop(struct media_entity *entity)
        media_entity_graph_walk_start(graph, entity);
 
        while ((entity = media_entity_graph_walk_next(graph))) {
-               entity->stream_count--;
-               if (entity->stream_count == 0)
-                       entity->pipe = NULL;
+               /* don't let the stream_count go negative */
+               if (entity->stream_count > 0) {
+                       entity->stream_count--;
+                       if (entity->stream_count == 0)
+                               entity->pipe = NULL;
+               }
        }
 
        if (!--pipe->streaming_count)