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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2013-01-21 06:51:41 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-02-06 09:33:58 -0200
commit05c79d0d1d0d44c2195d63d1e7c62e358eadeadf (patch)
tree80bcfd35aec18bb5c7bbb610219f33bc1e3982c9 /drivers/media
parentf23999eccb5f1b6ec858279670307b5b1abe887a (diff)
[media] uvcvideo: Implement videobuf2 .wait_prepare and .wait_finish operations
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>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/usb/uvc/uvc_queue.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index 778addc5caff..6c233a54ce40 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -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,

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