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V4L/DVB (13230): s2255drv: Don't conditionalize video buffer completion on waiting processes

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The s2255 driver had logic which aborted processing of a video frame
if there was no process waiting on the video buffer in question.  That
simply doesn't work when the application is doing things in an
asynchronous manner.  If the application went to the trouble to queue
the buffer in the first place, then the driver should always attempt
to complete it - even if the application at that moment has its
attention turned elsewhere.  Applications which always blocked waiting
for I/O on the capture device would not have been affected by this.
Applications which *mostly* blocked waiting for I/O on the capture
device probably only would have been somewhat affected (frame lossage,
at a rate which goes up as the application blocks less).  Applications
which never blocked on the capture device (e.g. polling only) however
would never have been able to receive any video frames, since in that
case this "is anyone waiting on this?" check on the buffer never would
have evalutated true.  This patch just deletes that harmful check
against the buffer's wait queue.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
CC: stable@kernel.org
This commit is contained in:
Mike Isely 2009-09-23 18:06:57 -03:00 committed by Mauro Carvalho Chehab
parent 78c948ab0c
commit 1f95725755
1 changed files with 0 additions and 5 deletions
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5
drivers/media/video/s2255drv.c
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@ -598,11 +598,6 @@ static int s2255_got_frame(struct s2255_dev *dev, int chn, int jpgsize)
buf = list_entry(dma_q->active.next,
struct s2255_buffer, vb.queue);
if (!waitqueue_active(&buf->vb.done)) {
/* no one active */
rc = -1;
goto unlock;
}
list_del(&buf->vb.queue);
do_gettimeofday(&buf->vb.ts);
dprintk(100, "[%p/%d] wakeup\n", buf, buf->vb.i);