[NET]: Check RTNL status in unregister_netdevice

The caller must hold the RTNL so let's check it in unregister_netdevice.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 4ced3836690b..7153e94f50ad 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3971,6 +3971,8 @@ void synchronize_net(void)
 
 void unregister_netdevice(struct net_device *dev)
 {
+        ASSERT_RTNL();
+
         rollback_registered(dev);
         /* Finish processing unregister after unlock */
         net_set_todo(dev);