Fixes: f599c64f ("xen-netfront: Fix race between device setup and open")
Reported-by: NBen Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: NRoss Lagerwall <ross.lagerwall@citrix.com>
Reviewed-by: NJuergen Gross <jgross@suse.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>