We must prevent module unloading if some devices are still attached to
l2tp_eth driver.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Reported-by: NDenys Fedoryshchenko <denys@visp.net.lb>
Tested-by: NDenys Fedoryshchenko <denys@visp.net.lb>
Cc: James Chapman <jchapman@katalix.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>