From 713eb7e466a32a7c315c799beb83a9d6c51e0e03 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Mon, 18 May 2009 02:13:13 +0000 Subject: saa7134-video.c: poll method lose race condition From: figo.zhang saa7134-video.c: poll method lose race condition Signed-off-by: Figo.zhang Signed-off-by: Mauro Carvalho Chehab --- linux/drivers/media/video/saa7134/saa7134-video.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'linux/drivers/media/video/saa7134') diff --git a/linux/drivers/media/video/saa7134/saa7134-video.c b/linux/drivers/media/video/saa7134/saa7134-video.c index 5f68bed54..26f1727e6 100644 --- a/linux/drivers/media/video/saa7134/saa7134-video.c +++ b/linux/drivers/media/video/saa7134/saa7134-video.c @@ -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; + rc = POLLERR; 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); -- cgit v1.2.3