int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) { struct video_device *vdev = video_devdata(file);
if (vb2_queue_is_busy(vdev, file)) return -EBUSY;
return vb2_expbuf(vdev->queue, p);
} EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf);