->dellink is going to be called with nd_lock is held

Signed-off-by: Kirill Tkhai <tkhai@ya.ru>
---
 net/6lowpan/core.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/6lowpan/core.c b/net/6lowpan/core.c
index b5cbf85b291c..bd77076b125e 100644
--- a/net/6lowpan/core.c
+++ b/net/6lowpan/core.c
@@ -71,15 +71,19 @@ EXPORT_SYMBOL(lowpan_register_netdev);
 
 void lowpan_unregister_netdevice(struct net_device *dev)
 {
-	unregister_netdevice(dev);
+	__unregister_netdevice(dev);
 	lowpan_dev_debugfs_exit(dev);
 }
 EXPORT_SYMBOL(lowpan_unregister_netdevice);
 
 void lowpan_unregister_netdev(struct net_device *dev)
 {
+	struct nd_lock *nd_lock;
+
 	rtnl_lock();
+	lock_netdev(dev, &nd_lock);
 	lowpan_unregister_netdevice(dev);
+	unlock_netdev(nd_lock);
 	rtnl_unlock();
 }
 EXPORT_SYMBOL(lowpan_unregister_netdev);