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authorBrandon Philips <bphilips@suse.de>2007-09-27 20:55:28 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2007-10-10 00:03:05 -0300
commit00f98d0804c88c29bef81cb98c861f13c9b33f30 (patch)
tree0ca7f4b912e31f49fe342a29558d14b8cf2d395c /drivers/media/video/videobuf-core.c
parentba32bd95d431525ad2ffac97cadf9ee40b63939e (diff)
downloadop-kernel-dev-00f98d0804c88c29bef81cb98c861f13c9b33f30.zip
op-kernel-dev-00f98d0804c88c29bef81cb98c861f13c9b33f30.tar.gz
V4L/DVB (6276): V4L: videobuf-core.c lock before streaming check
The reading/streaming fields are used for mutual exclusion of the queue and should be protected by the queue lock. Signed-off-by: Brandon Philips <bphilips@suse.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org> http://thread.gmane.org/gmane.comp.video.video4linux/34978/focus=34981 Reviewed-by: Ricardo Cerqueira <v4l@cerqueira.org>
Diffstat (limited to 'drivers/media/video/videobuf-core.c')
-rw-r--r--drivers/media/video/videobuf-core.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c
index a27e114..ca67f80 100644
--- a/drivers/media/video/videobuf-core.c
+++ b/drivers/media/video/videobuf-core.c
@@ -289,16 +289,18 @@ int videobuf_reqbufs(struct videobuf_queue *q,
return -EINVAL;
}
+ mutex_lock(&q->lock);
if (q->streaming) {
dprintk(1,"reqbufs: streaming already exists\n");
- return -EBUSY;
+ retval = -EBUSY;
+ goto done;
}
if (!list_empty(&q->stream)) {
dprintk(1,"reqbufs: stream running\n");
- return -EBUSY;
+ retval = -EBUSY;
+ goto done;
}
- mutex_lock(&q->lock);
count = req->count;
if (count > VIDEO_MAX_FRAME)
count = VIDEO_MAX_FRAME;
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