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[media] cx23885: ensure video is streaming before allowing vbi to stream

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Signed-off-by: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Steven Toth 2011-10-10 11:09:54 -03:00 committed by Mauro Carvalho Chehab
parent af76e9f625
commit 24465b4485
1 changed files with 8 additions and 0 deletions
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8
drivers/media/video/cx23885/cx23885-video.c
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@ -1100,6 +1100,14 @@ static int vidioc_streamon(struct file *file, void *priv,
if (unlikely(!res_get(dev, fh, get_resource(fh))))
return -EBUSY;
/* Don't start VBI streaming unless vida streaming
* has already started.
*/
if ((fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) &&
((cx_read(VID_A_DMA_CTL) & 0x11) == 0))
return -EINVAL;
return videobuf_streamon(get_queue(fh));
}