diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c index 872640a9e73a15..b23aa3c8bdf8ee 100644 --- a/drivers/net/team/team.c +++ b/drivers/net/team/team.c @@ -1171,6 +1171,13 @@ static int team_port_add(struct team *team, struct net_device *port_dev, return -EBUSY; } + if (netdev_has_upper_dev(port_dev, dev)) { + NL_SET_ERR_MSG(extack, "Device is already a lower device of the team interface"); + netdev_err(dev, "Device %s is already a lower device of the team interface\n", + portname); + return -EBUSY; + } + if (port_dev->features & NETIF_F_VLAN_CHALLENGED && vlan_uses_dev(dev)) { NL_SET_ERR_MSG(extack, "Device is VLAN challenged and team device has VLAN set up");