[PATCH NET-PREV 51/51] net: Make all NETDEV_REGISTER events to be called under nd_lock

[Kirill Tkhai]

Signed-off-by: Kirill Tkhai <tkhai@xxxxx>
---
 net/core/dev.c |   24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index c477b39d08b9..03c1bfa35309 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1737,13 +1737,19 @@ static void call_netdevice_unregister_notifiers(struct notifier_block *nb,
 }
 
 static int call_netdevice_register_net_notifiers(struct notifier_block *nb,
-						 struct net *net)
+						 struct net *net,
+						 bool locked)
 {
+	struct nd_lock *nd_lock;
 	struct net_device *dev;
 	int err;
 
 	for_each_netdev(net, dev) {
+		if (!locked)
+			lock_netdev(dev, &nd_lock);
 		err = call_netdevice_register_notifiers(nb, dev);
+		if (!locked)
+			unlock_netdev(nd_lock);
 		if (err)
 			goto rollback;
 	}
@@ -1794,7 +1800,7 @@ int register_netdevice_notifier(struct notifier_block *nb)
 	if (dev_boot_phase)
 		goto unlock;
 	for_each_net(net) {
-		err = call_netdevice_register_net_notifiers(nb, net);
+		err = call_netdevice_register_net_notifiers(nb, net, false);
 		if (err)
 			goto rollback;
 	}
@@ -1851,7 +1857,8 @@ EXPORT_SYMBOL(unregister_netdevice_notifier);
 
 static int __register_netdevice_notifier_net(struct net *net,
 					     struct notifier_block *nb,
-					     bool ignore_call_fail)
+					     bool ignore_call_fail,
+					     bool locked)
 {
 	int err;
 
@@ -1861,7 +1868,7 @@ static int __register_netdevice_notifier_net(struct net *net,
 	if (dev_boot_phase)
 		return 0;
 
-	err = call_netdevice_register_net_notifiers(nb, net);
+	err = call_netdevice_register_net_notifiers(nb, net, locked);
 	if (err && !ignore_call_fail)
 		goto chain_unregister;
 
@@ -1905,7 +1912,7 @@ int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb)
 	int err;
 
 	rtnl_lock();
-	err = __register_netdevice_notifier_net(net, nb, false);
+	err = __register_netdevice_notifier_net(net, nb, false, false);
 	rtnl_unlock();
 	return err;
 }
@@ -1944,17 +1951,20 @@ static void __move_netdevice_notifier_net(struct net *src_net,
 					  struct notifier_block *nb)
 {
 	__unregister_netdevice_notifier_net(src_net, nb);
-	__register_netdevice_notifier_net(dst_net, nb, true);
+	__register_netdevice_notifier_net(dst_net, nb, true, true);
 }
 
 int register_netdevice_notifier_dev_net(struct net_device *dev,
 					struct notifier_block *nb,
 					struct netdev_net_notifier *nn)
 {
+	struct nd_lock *nd_lock;
 	int err;
 
 	rtnl_lock();
-	err = __register_netdevice_notifier_net(dev_net(dev), nb, false);
+	lock_netdev(dev, &nd_lock);
+	err = __register_netdevice_notifier_net(dev_net(dev), nb, false, true);
+	unlock_netdev(nd_lock);
 	if (!err) {
 		nn->nb = nb;
 		list_add(&nn->list, &dev->net_notifier_list);