3 files changed, 20 insertions, 13 deletions

diff --git a/net/mctp/device.c b/net/mctp/device.c
index c34963974cc1..f556c6d01abc 100644
--- a/net/mctp/device.c
+++ b/net/mctp/device.c
@@ -35,14 +35,6 @@ struct mctp_dev *mctp_dev_get_rtnl(const struct net_device *dev)
 	return rtnl_dereference(dev->mctp_ptr);
 }
 
-static void mctp_dev_destroy(struct mctp_dev *mdev)
-{
-	struct net_device *dev = mdev->dev;
-
-	dev_put(dev);
-	kfree_rcu(mdev, rcu);
-}
-
 static int mctp_fill_addrinfo(struct sk_buff *skb, struct netlink_callback *cb,
 			      struct mctp_dev *mdev, mctp_eid_t eid)
 {
@@ -255,6 +247,19 @@ static int mctp_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
 	return 0;
 }
 
+void mctp_dev_hold(struct mctp_dev *mdev)
+{
+	refcount_inc(&mdev->refs);
+}
+
+void mctp_dev_put(struct mctp_dev *mdev)
+{
+	if (refcount_dec_and_test(&mdev->refs)) {
+		dev_put(mdev->dev);
+		kfree_rcu(mdev, rcu);
+	}
+}
+
 static struct mctp_dev *mctp_add_dev(struct net_device *dev)
 {
 	struct mctp_dev *mdev;
@@ -270,7 +275,9 @@ static struct mctp_dev *mctp_add_dev(struct net_device *dev)
 	mdev->net = mctp_default_net(dev_net(dev));
 
 	/* associate to net_device */
+	refcount_set(&mdev->refs, 1);
 	rcu_assign_pointer(dev->mctp_ptr, mdev);
+
 	dev_hold(dev);
 	mdev->dev = dev;
 
@@ -345,7 +352,7 @@ static void mctp_unregister(struct net_device *dev)
 	mctp_neigh_remove_dev(mdev);
 	kfree(mdev->addrs);
 
-	mctp_dev_destroy(mdev);
+	mctp_dev_put(mdev);
 }
 
 static int mctp_register(struct net_device *dev)
diff --git a/net/mctp/neigh.c b/net/mctp/neigh.c
index 90ed2f02d1fb..5cc042121493 100644
--- a/net/mctp/neigh.c
+++ b/net/mctp/neigh.c
@@ -47,7 +47,7 @@ static int mctp_neigh_add(struct mctp_dev *mdev, mctp_eid_t eid,
 	}
 	INIT_LIST_HEAD(&neigh->list);
 	neigh->dev = mdev;
-	dev_hold(neigh->dev->dev);
+	mctp_dev_hold(neigh->dev);
 	neigh->eid = eid;
 	neigh->source = source;
 	memcpy(neigh->ha, lladdr, lladdr_len);
@@ -63,7 +63,7 @@ static void __mctp_neigh_free(struct rcu_head *rcu)
 {
 	struct mctp_neigh *neigh = container_of(rcu, struct mctp_neigh, rcu);
 
-	dev_put(neigh->dev->dev);
+	mctp_dev_put(neigh->dev);
 	kfree(neigh);
 }
 
diff --git a/net/mctp/route.c b/net/mctp/route.c
index b2243b150e71..37aa67847a5a 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -455,7 +455,7 @@ static int mctp_route_output(struct mctp_route *route, struct sk_buff *skb)
 static void mctp_route_release(struct mctp_route *rt)
 {
 	if (refcount_dec_and_test(&rt->refs)) {
-		dev_put(rt->dev->dev);
+		mctp_dev_put(rt->dev);
 		kfree_rcu(rt, rcu);
 	}
 }
@@ -815,7 +815,7 @@ static int mctp_route_add(struct mctp_dev *mdev, mctp_eid_t daddr_start,
 	rt->max = daddr_start + daddr_extent;
 	rt->mtu = mtu;
 	rt->dev = mdev;
-	dev_hold(rt->dev->dev);
+	mctp_dev_hold(rt->dev);
 	rt->type = type;
 	rt->output = rtfn;