From e2d0576f0c009acdba63e1d763276743ff3788cc Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Tue, 8 Mar 2022 11:15:13 +0200 Subject: [PATCH] net: dsa: be mostly no-op in dsa_slave_set_mac_address when down Since the slave unicast address is synced to hardware and to the DSA master during dsa_slave_open(), this means that a call to dsa_slave_set_mac_address() while the slave interface is down will result to a call to dsa_port_standalone_host_fdb_del() and to dev_uc_del() for the MAC address while there was no previous dsa_port_standalone_host_fdb_add() or dev_uc_add(). This is a partial revert of the blamed commit below, which was too aggressive. Fixes: 35aae5ab9121 ("net: dsa: remove workarounds for changing master promisc/allmulti only while up") Signed-off-by: Vladimir Oltean Signed-off-by: David S. Miller --- net/dsa/slave.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/net/dsa/slave.c b/net/dsa/slave.c index 42436ac6993b..a61a7c54af20 100644 --- a/net/dsa/slave.c +++ b/net/dsa/slave.c @@ -305,6 +305,12 @@ static int dsa_slave_set_mac_address(struct net_device *dev, void *a) if (!is_valid_ether_addr(addr->sa_data)) return -EADDRNOTAVAIL; + /* If the port is down, the address isn't synced yet to hardware or + * to the DSA master, so there is nothing to change. + */ + if (!(dev->flags & IFF_UP)) + goto out_change_dev_addr; + if (dsa_switch_supports_uc_filtering(ds)) { err = dsa_port_standalone_host_fdb_add(dp, addr->sa_data, 0); if (err) @@ -323,6 +329,7 @@ static int dsa_slave_set_mac_address(struct net_device *dev, void *a) if (dsa_switch_supports_uc_filtering(ds)) dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0); +out_change_dev_addr: eth_hw_addr_set(dev, addr->sa_data); return 0;