[PATCH net-next 1/6] net: hold instance lock around NETDEV_DOWN/GOING_DOWN

[Stanislav Fomichev <sdf.kernel@gmail.com>]

Mirror what call_netdevice_register_net_notifiers does but for the
teardown. Cover only DOWN and GOING_DOWN. UNREGISTER is still unlocked
because of the SW devices using dev_xxx methods.

Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
---
 net/core/dev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index 4b3d5cfdf6e0..9d49493f4fb5 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1912,9 +1912,11 @@ static void call_netdevice_unregister_notifiers(struct notifier_block *nb,
 						struct net_device *dev)
 {
 	if (dev->flags & IFF_UP) {
+		netdev_lock_ops(dev);
 		call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
 					dev);
 		call_netdevice_notifier(nb, NETDEV_DOWN, dev);
+		netdev_unlock_ops(dev);
 	}
 	call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
 }
-- 
2.53.0-Meta