diff options
Diffstat (limited to 'include/media/v4l2-dev.h')
| -rw-r--r-- | include/media/v4l2-dev.h | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h index 1b6222fab24e..a69801274800 100644 --- a/include/media/v4l2-dev.h +++ b/include/media/v4l2-dev.h @@ -313,10 +313,16 @@ struct video_device { * media_entity_to_video_device - Returns a &struct video_device from * the &struct media_entity embedded on it. * - * @__entity: pointer to &struct media_entity - */ -#define media_entity_to_video_device(__entity) \ - container_of(__entity, struct video_device, entity) + * @__entity: pointer to &struct media_entity, may be NULL + */ +#define media_entity_to_video_device(__entity) \ +({ \ + typeof(__entity) __me_vdev_ent = __entity; \ + \ + __me_vdev_ent ? \ + container_of(__me_vdev_ent, struct video_device, entity) : \ + NULL; \ +}) /** * to_video_device - Returns a &struct video_device from the |