[PATCH v3 1/2] v4l: subdev: tolerate null in media_entity_to_v4l2_subdev

[Kieran Bingham]

From: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com>

Return NULL, if a null entity is parsed for it's v4l2_subdev

Signed-off-by: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com>
---
 include/media/v4l2-subdev.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 5f1669c45642..d43fa7ca3a92 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -829,7 +829,7 @@ struct v4l2_subdev {
 };
 
 #define media_entity_to_v4l2_subdev(ent) \
-       container_of(ent, struct v4l2_subdev, entity)
+       ent ? container_of(ent, struct v4l2_subdev, entity) : NULL
 #define vdev_to_v4l2_subdev(vdev) \
        ((struct v4l2_subdev *)video_get_drvdata(vdev))
 
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