[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, 11 insertions, 0 deletions

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 3afff92804d3..378ae02e593b 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1000,6 +1000,17 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
                 return uvc_query_buffer(&stream->queue, buf);
         }
 
+        case VIDIOC_CREATE_BUFS:
+        {
+                struct v4l2_create_buffers *cb = arg;
+
+                ret = uvc_acquire_privileges(handle);
+                if (ret < 0)
+                        return ret;
+
+                return uvc_create_buffers(&stream->queue, cb);
+        }
+
         case VIDIOC_QBUF:
                 if (!uvc_has_privileges(handle))
                         return -EBUSY;