Re: [PATCH net-next 2/4] net: dsa: automatically bring user ports down when master goes down

+	case NETDEV_GOING_DOWN: {
+		struct dsa_port *dp, *cpu_dp;
+		struct dsa_switch_tree *dst;
+		int err = 0;
+
+		if (!netdev_uses_dsa(dev))
+			return NOTIFY_DONE;
+
+		cpu_dp = dev->dsa_ptr;
+		dst = cpu_dp->ds->dst;
+
+		list_for_each_entry(dp, &dst->ports, list) {
+			if (!dsa_is_user_port(dp->ds, dp->index)) {

!dsa_is_user_port() ??

That ! seems odd. 

+				struct net_device *slave = dp->slave;
+
+				if (!(slave->flags & IFF_UP))
+					continue;
+
+				err = dev_change_flags(slave,
+						       slave->flags & ~IFF_UP,
+						       NULL);

  Andrew