net: bridge: add net device refcount tracker

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/bridge/br_if.c

@@ -274,7 +274,7 @@ static void destroy_nbp(struct net_bridge_port *p)
 
 	p->br = NULL;
 	p->dev = NULL;
-	dev_put(dev);
+	dev_put_track(dev, &p->dev_tracker);
 
 	kobject_put(&p->kobj);
 }
@@ -423,7 +423,7 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
 		return ERR_PTR(-ENOMEM);
 
 	p->br = br;
-	dev_hold(dev);
+	dev_hold_track(dev, &p->dev_tracker, GFP_KERNEL);
 	p->dev = dev;
 	p->path_cost = port_cost(dev);
 	p->priority = 0x8000 >> BR_PORT_BITS;
@@ -434,7 +434,7 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
 	br_stp_port_timer_init(p);
 	err = br_multicast_add_port(p);
 	if (err) {
-		dev_put(dev);
+		dev_put_track(dev, &p->dev_tracker);
 		kfree(p);
 		p = ERR_PTR(err);
 	}

net/bridge/br_private.h

@@ -344,6 +344,7 @@ struct net_bridge_mdb_entry {
 struct net_bridge_port {
 	struct net_bridge		*br;
 	struct net_device		*dev;
+	netdevice_tracker		dev_tracker;
 	struct list_head		list;
 
 	unsigned long			flags;