V4L/DVB (6049): ivtv: fix VBI reinsertion decoding

- Invalid VBI packets should result in an empty VBI frame, not
  in an zero-sized frame that causes the reader to incorrectly
  return a 0 (EOF) value.
- PIO completion should not reset the sg_pending_size field.
- The DMA offset detection code should be ignored for PIO transfers:
  it somehow messes up the data on the card and is not needed anyway
  for PIO.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/media/video/ivtv/ivtv-vbi.c b/drivers/media/video/ivtv/ivtv-vbi.c
index a7282a91bd97..a58c833c2b04 100644
--- a/drivers/media/video/ivtv/ivtv-vbi.c
+++ b/drivers/media/video/ivtv/ivtv-vbi.c
@@ -163,8 +163,8 @@ static int ivtv_convert_ivtv_vbi(struct ivtv *itv, u8 *p)
                 linemask[1] = 0xf;
                 p += 4;
         } else {
-                /* unknown VBI data stream */
-                return 0;
+                /* unknown VBI data, convert to empty VBI frame */
+                linemask[0] = linemask[1] = 0;
         }
         for (i = 0; i < 36; i++) {
                 int err = 0;