[media] omap3isp: Don't accept pipelines with no video source as valid

Make sure the pipeline has a valid video source (either a subdev with no
sink pad, or a non-subdev entity) at stream-on time and return -EPIPE if
no video source can be found.

Reported-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/omap3isp/ispvideo.c b/drivers/media/video/omap3isp/ispvideo.c
index fd965ad..fd94cdf 100644 (file)
--- a/drivers/media/video/omap3isp/ispvideo.c
+++ b/drivers/media/video/omap3isp/ispvideo.c
@@ -278,7 +278,8 @@ isp_video_far_end(struct isp_video *video)
  * limits reported by every block in the pipeline.
  *
  * Return 0 if all formats match, or -EPIPE if at least one link is found with
- * different formats on its two ends.
+ * different formats on its two ends or if the pipeline doesn't start with a
+ * video source (either a subdev with no input pad, or a non-subdev entity).
  */
 static int isp_video_validate_pipeline(struct isp_pipeline *pipe)
 {
@@ -329,10 +330,15 @@ static int isp_video_validate_pipeline(struct isp_pipeline *pipe)
                 * in the middle of it. */
                shifter_link = subdev == &isp->isp_ccdc.subdev;
 
-               /* Retrieve the source format */
+               /* Retrieve the source format. Return an error if no source
+                * entity can be found, and stop checking the pipeline if the
+                * source entity isn't a subdev.
+                */
                pad = media_entity_remote_source(pad);
-               if (pad == NULL ||
-                   media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
+               if (pad == NULL)
+                       return -EPIPE;
+
+               if (media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
                        break;
 
                subdev = media_entity_to_v4l2_subdev(pad->entity);