if (unlikely(!res_get(dev, fh, get_resource(fh))))
return -EBUSY;
+
+ /* Don't start VBI streaming unless vida streaming
+ * has already started.
+ */
+ if ((fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) &&
+ ((cx_read(VID_A_DMA_CTL) & 0x11) == 0))
+ return -EINVAL;
+
return videobuf_streamon(get_queue(fh));
}