[PATCH] cx18: Move spinlock and vb_type initialisation into stream_init

[Simon Farnsworth <simon.farnsworth@onelan.co.uk>]

The initialisation of vb_type in serialized_open was preventing
REQBUFS from working reliably. Remove it, and move the spinlock into
stream_init for good measure - it's only used when we have a stream
that supports videobuf anyway.

Signed-off-by: Simon Farnsworth <simon.farnsworth@onelan.co.uk>
---
Mauro,

This fixes a bug I introduced, and noticed while trying to work out
how videobuf works and interacts with the rest of the driver, in
preparation for working out how to port this code to videobuf2.

Briefly, if you open a device node at the wrong time, you lose
videobuf support forever.

Please consider this for 2.6.40,

Simon

 drivers/media/video/cx18/cx18-fileops.c |    3 ---
 drivers/media/video/cx18/cx18-streams.c |    2 ++
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/video/cx18/cx18-fileops.c b/drivers/media/video/cx18/cx18-fileops.c
index 6609222..07411f3 100644
--- a/drivers/media/video/cx18/cx18-fileops.c
+++ b/drivers/media/video/cx18/cx18-fileops.c
@@ -810,9 +810,6 @@ static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
 	item->cx = cx;
 	item->type = s->type;
 
-	spin_lock_init(&s->vbuf_q_lock);
-	s->vb_type = 0;
-
 	item->open_id = cx->open_id++;
 	filp->private_data = &item->fh;
 
diff --git a/drivers/media/video/cx18/cx18-streams.c b/drivers/media/video/cx18/cx18-streams.c
index 24c9688..4282ff5 100644
--- a/drivers/media/video/cx18/cx18-streams.c
+++ b/drivers/media/video/cx18/cx18-streams.c
@@ -275,6 +275,8 @@ static void cx18_stream_init(struct cx18 *cx, int type)
 	init_timer(&s->vb_timeout);
 	spin_lock_init(&s->vb_lock);
 	if (type == CX18_ENC_STREAM_TYPE_YUV) {
+		spin_lock_init(&s->vbuf_q_lock);
+
 		s->vb_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 		videobuf_queue_vmalloc_init(&s->vbuf_q, &cx18_videobuf_qops,
 			&cx->pci_dev->dev, &s->vbuf_q_lock,
-- 
1.7.4