[media] uvcvideo: Don't skip erroneous payloads

Instead of skipping the payload completely, which would make the
resulting image corrupted anyway, store the payload normally and mark
the buffer as erroneous. If the no_drop module parameter is set to 1 the
buffer will then be passed to userspace, and tt will then be up to the
application to decide what to do with the buffer.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c
index b953dae..a57f813 100644 (file)
--- a/drivers/media/video/uvc/uvc_video.c
+++ b/drivers/media/video/uvc/uvc_video.c
@@ -409,13 +409,6 @@ static int uvc_video_decode_start(struct uvc_streaming *stream,
        if (len < 2 || data[0] < 2 || data[0] > len)
                return -EINVAL;
 
-       /* Skip payloads marked with the error bit ("error frames"). */
-       if (data[1] & UVC_STREAM_ERR) {
-               uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit "
-                         "set).\n");
-               return -ENODATA;
-       }
-
        fid = data[1] & UVC_STREAM_FID;
 
        /* Increase the sequence number regardless of any buffer states, so
@@ -432,6 +425,13 @@ static int uvc_video_decode_start(struct uvc_streaming *stream,
                return -ENODATA;
        }
 
+       /* Mark the buffer as bad if the error bit is set. */
+       if (data[1] & UVC_STREAM_ERR) {
+               uvc_trace(UVC_TRACE_FRAME, "Marking buffer as bad (error bit "
+                         "set).\n");
+               buf->error = 1;
+       }
+
        /* Synchronize to the input stream by waiting for the FID bit to be
         * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE.
         * stream->last_fid is initialized to -1, so the first isochronous