[media] uvcvideo: Enable VIDIOC_CREATE_BUFS

This patch enables the ioctl to create additional buffers on the
videobuf2 capture queue.

[laurent.pinchart@ideasonboard.com: Acquire privileges instead of just
checking them in VIDIOC_CREATE_BUFS implementation]

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index d46dd7011ed3..ff7be9702486 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -198,6 +198,18 @@ int uvc_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
         return ret;
 }
 
+int uvc_create_buffers(struct uvc_video_queue *queue,
+                       struct v4l2_create_buffers *cb)
+{
+        int ret;
+
+        mutex_lock(&queue->mutex);
+        ret = vb2_create_bufs(&queue->queue, cb);
+        mutex_unlock(&queue->mutex);
+
+        return ret;
+}
+
 int uvc_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
 {
         int ret;