V4L2_BUF_FLAG_REQUEST_FD
if (!is_prepare && (b->flags & V4L2_BUF_FLAG_REQUEST_FD) &&
if (!(b->flags & V4L2_BUF_FLAG_REQUEST_FD)) {
V4L2_BUF_FLAG_REQUEST_FD | \
b->flags |= V4L2_BUF_FLAG_REQUEST_FD;
if (b->flags & V4L2_BUF_FLAG_REQUEST_FD)
(buf->flags & V4L2_BUF_FLAG_REQUEST_FD)) {