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rtnl_is_locked() doesn't check who holds this lock, it just tells that it's locked right now. if caif::ldisc_close really can be called under rtrnl_lock then it should release net device in other context because there is no way to grab rtnl_lock without deadlock. This patch adds work which releases these devices. Also this patch fixes calling dev_close/unregister_netdevice without rtnl_lock from caif_ser_exit(). Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no> Signed-off-by: David S. Miller <davem@davemloft.net>