Hi Prabhakar,
Thank you for the patch.
On Wednesday 26 November 2014 22:42:34 Lad, Prabhakar wrote:
> This patch drops driver specific wait_prepare() and
> wait_finish() callbacks from vb2_ops and instead uses
> the the helpers vb2_ops_wait_prepare/finish() provided
> by the vb2 core, the lock member of the queue needs
> to be initalized to a mutex so that vb2 helpers
> vb2_ops_wait_prepare/finish() can make use of it.
The queue lock field isn't initialized by the uvcvideo driver, so you can't
use vb2_ops_wait_prepare|finish().
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@xxxxxxxxx>
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> drivers/media/usb/uvc/uvc_queue.c | 18 ++----------------
> 1 file changed, 2 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/media/usb/uvc/uvc_queue.c
> b/drivers/media/usb/uvc/uvc_queue.c index cc96072..64147b5 100644
> --- a/drivers/media/usb/uvc/uvc_queue.c
> +++ b/drivers/media/usb/uvc/uvc_queue.c
> @@ -143,20 +143,6 @@ static void uvc_buffer_finish(struct vb2_buffer *vb)
> uvc_video_clock_update(stream, &vb->v4l2_buf, buf);
> }
>
> -static void uvc_wait_prepare(struct vb2_queue *vq)
> -{
> - struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
> -
> - mutex_unlock(&queue->mutex);
> -}
> -
> -static void uvc_wait_finish(struct vb2_queue *vq)
> -{
> - struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
> -
> - mutex_lock(&queue->mutex);
> -}
> -
> static int uvc_start_streaming(struct vb2_queue *vq, unsigned int count)
> {
> struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
> @@ -195,8 +181,8 @@ static struct vb2_ops uvc_queue_qops = {
> .buf_prepare = uvc_buffer_prepare,
> .buf_queue = uvc_buffer_queue,
> .buf_finish = uvc_buffer_finish,
> - .wait_prepare = uvc_wait_prepare,
> - .wait_finish = uvc_wait_finish,
> + .wait_prepare = vb2_ops_wait_prepare,
> + .wait_finish = vb2_ops_wait_finish,
> .start_streaming = uvc_start_streaming,
> .stop_streaming = uvc_stop_streaming,
> };
--
Regards,
Laurent Pinchart
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