From: YueHaibing <yuehaib...@huawei.com> [ Upstream commit 9e7e6cabf371cc008cb2244a04c012b516753693 ]
Fixes gcc '-Wunused-but-set-variable' warning: drivers/net/net_failover.c: In function 'net_failover_slave_unregister': drivers/net/net_failover.c:598:35: warning: variable 'primary_dev' set but not used [-Wunused-but-set-variable] There should check the validity of 'slave_dev'. Fixes: cfc80d9a1163 ("net: Introduce net_failover driver") Signed-off-by: YueHaibing <yuehaib...@huawei.com> Acked-by: Sridhar Samudrala <sridhar.samudr...@intel.com> Signed-off-by: David S. Miller <da...@davemloft.net> Signed-off-by: Sasha Levin <sas...@kernel.org> --- drivers/net/net_failover.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/net_failover.c b/drivers/net/net_failover.c index 7ae1856d1f18..5a749dc25bec 100644 --- a/drivers/net/net_failover.c +++ b/drivers/net/net_failover.c @@ -603,6 +603,9 @@ static int net_failover_slave_unregister(struct net_device *slave_dev, primary_dev = rtnl_dereference(nfo_info->primary_dev); standby_dev = rtnl_dereference(nfo_info->standby_dev); + if (WARN_ON_ONCE(slave_dev != primary_dev && slave_dev != standby_dev)) + return -ENODEV; + vlan_vids_del_by_dev(slave_dev, failover_dev); dev_uc_unsync(slave_dev, failover_dev); dev_mc_unsync(slave_dev, failover_dev); -- 2.17.1