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V4L/DVB (11852): saa7134-video.c: poll method lose race condition

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saa7134-video.c: poll method lose race condition

Signed-off-by: Figo Zhang <figo.zhang@kolorific.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
figo.zhang 2009-05-17 23:13:13 -03:00 committed by Mauro Carvalho Chehab
parent 7d8535329c
commit 4a567394dc
1 changed files with 6 additions and 3 deletions
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9
drivers/media/video/saa7134/saa7134-video.c
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@ -1423,11 +1423,13 @@ video_poll(struct file *file, struct poll_table_struct *wait)
{
struct saa7134_fh *fh = file->private_data;
struct videobuf_buffer *buf = NULL;
unsigned int rc = 0;
if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type)
return videobuf_poll_stream(file, &fh->vbi, wait);
if (res_check(fh,RESOURCE_VIDEO)) {
mutex_lock(&fh->cap.vb_lock);
if (!list_empty(&fh->cap.stream))
buf = list_entry(fh->cap.stream.next, struct videobuf_buffer, stream);
} else {
@ -1446,13 +1448,14 @@ video_poll(struct file *file, struct poll_table_struct *wait)
}
if (!buf)
return POLLERR;
goto err;
poll_wait(file, &buf->done, wait);
if (buf->state == VIDEOBUF_DONE ||
buf->state == VIDEOBUF_ERROR)
return POLLIN|POLLRDNORM;
return 0;
rc = POLLIN|POLLRDNORM;
mutex_unlock(&fh->cap.vb_lock);
return rc;
err:
mutex_unlock(&fh->cap.vb_lock);