From: Oliver Hartkopp <socketcan@hartkopp.net> [ Upstream commit 2091a3d42b4f339eaeed11228e0cbe9d4f92f558 ] As the description before netdev_run_todo, we cannot call free_netdev before rtnl_unlock, fix it by reorder the code. This patch is a 1:1 copy of upstream slip.c commit f596c87005f7 ("slip: not call free_netdev before rtnl_unlock in slip_open"). Reported-by: yangerkun <yangerkun@huawei.com> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- drivers/net/can/slcan.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c index b2e5bca..db96078 100644 --- a/drivers/net/can/slcan.c +++ b/drivers/net/can/slcan.c @@ -621,7 +621,10 @@ static int slcan_open(struct tty_struct *tty) tty->disc_data = NULL; clear_bit(SLF_INUSE, &sl->flags); slc_free_netdev(sl->dev); + /* do not call free_netdev before rtnl_unlock */ + rtnl_unlock(); free_netdev(sl->dev); + return err; err_exit: rtnl_unlock(); -- 1.8.3