mlxsw: spectrum: Disable lag port TX before removing it

Make sure that lag port TX is disabled before mlxsw_sp_port_lag_leave()
is called and prevent from possible EMAD error.

Fixes: 0d65fc13 ("mlxsw: spectrum: Implement LAG port join/leave")
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -5005,12 +5005,15 @@ static int mlxsw_sp_netdevice_port_upper_event(struct net_device *lower_dev,
 							   lower_dev,
 							   upper_dev);
 		} else if (netif_is_lag_master(upper_dev)) {
-			if (info->linking)
+			if (info->linking) {
 				err = mlxsw_sp_port_lag_join(mlxsw_sp_port,
 							     upper_dev);
-			else
+			} else {
+				mlxsw_sp_port_lag_tx_en_set(mlxsw_sp_port,
+							    false);
 				mlxsw_sp_port_lag_leave(mlxsw_sp_port,
 							upper_dev);
+			}
 		} else if (netif_is_ovs_master(upper_dev)) {
 			if (info->linking)
 				err = mlxsw_sp_port_ovs_join(mlxsw_sp_port);