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[media] uvcvideo: Implement videobuf2 .wait_prepare and .wait_finish operations

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Those optional operations are used to release and reacquire the queue
lock when videobuf2 needs to perform operations that sleep for a long
time, such as waiting for a buffer to be complete. Implement them to
avoid blocking qbuf or streamoff calls when a dqbuf is in progress.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Laurent Pinchart 2013-01-21 06:51:41 -03:00 committed by Mauro Carvalho Chehab
parent f23999eccb
commit 05c79d0d1d
1 changed files with 16 additions and 0 deletions
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16
drivers/media/usb/uvc/uvc_queue.c
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@ -115,11 +115,27 @@ static int uvc_buffer_finish(struct vb2_buffer *vb)
return 0;
}
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 struct vb2_ops uvc_queue_qops = {
.queue_setup = uvc_queue_setup,
.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,
};
int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,