V4L/DVB: videobuf: add queue argument to videobuf_waiton()

videobuf_waiton() must unlock and relock ext_lock if it has to wait.
For that to happen it needs the videobuf_queue pointer.

Don't attempt to unlock/relock q->ext_lock unless it was locked in the
first place.

vb->state has to be protected by a spinlock to be safe.

This patch is based on code from Mauro Carvalho Chehab <mchehab@redhat.com>.

[mchehab@redhat.com: add extra argument to a few missing places]
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/media/videobuf-core.h b/include/media/videobuf-core.h
index 9a4194557e4a..1d3835fc26be 100644
--- a/include/media/videobuf-core.h
+++ b/include/media/videobuf-core.h
@@ -180,7 +180,8 @@ static inline void videobuf_queue_unlock(struct videobuf_queue *q)
                 mutex_unlock(&q->vb_lock);
 }
 
-int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr);
+int videobuf_waiton(struct videobuf_queue *q, struct videobuf_buffer *vb,
+                int non_blocking, int intr);
 int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
                 struct v4l2_framebuffer *fbuf);