On Fri,  2 Aug 2019 13:57:36 +0300
Nikolay Aleksandrov [off-list ref] wrote:

quoted

+int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr)
 {
 	struct netdev_notifier_changeupper_info *info;
-	struct net_bridge *br;
+	struct net_bridge *br = netdev_priv(dev);
+	bool changed;
+	int ret = 0;
 
 	switch (event) {
+	case NETDEV_REGISTER:
+		ret = br_vlan_add(br, br->default_pvid,
+				  BRIDGE_VLAN_INFO_PVID |
+				  BRIDGE_VLAN_INFO_UNTAGGED |
+				  BRIDGE_VLAN_INFO_BRENTRY, &changed, NULL);
+		break;

Looks good.

As minor optimization br_vlan_add could ignore changed pointer if NULL.
This would save places where you don't care.


Something like:

diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 021cc9f66804..bacd3543b215 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c

@@ -626,10 +626,11 @@ static int br_vlan_add_existing(struct net_bridge *br,
 		refcount_inc(&vlan->refcnt);
 		vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
 		vg->num_vlans++;
-		*changed = true;
+		if (changed)
+			*changed = true;
 	}
 
-	if (__vlan_add_flags(vlan, flags))
+	if (__vlan_add_flags(vlan, flags) && changed)
 		*changed = true;
 
 	return 0;

@@ -653,7 +654,8 @@ int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed,
 
 	ASSERT_RTNL();
 
-	*changed = false;
+	if (changed)
+		*changed = false;
 	vg = br_vlan_group(br);
 	vlan = br_vlan_find(vg, vid);
 	if (vlan)

@@ -679,7 +681,7 @@ int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed,
 	if (ret) {
 		free_percpu(vlan->stats);
 		kfree(vlan);
-	} else {
+	} else if (changed) {
 		*changed = true;
 	}