diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 6845a258408ff9a08cfd57b166464a1f2cd402b4..f3a2e29be40c30b173f447bc5ee412cf28c2dcc4 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -428,6 +428,10 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
 	spin_lock_bh(&br->lock);
 	br_stp_recalculate_bridge_id(br);
 	br_features_recompute(br);
+
+	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
+	    (br->dev->flags & IFF_UP))
+		br_stp_enable_port(p);
 	spin_unlock_bh(&br->lock);
 
 	dev_set_mtu(br->dev, br_min_mtu(br));