1 files changed, 4 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index c09ff096525a..2c7934f8cf3e 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5686,6 +5686,10 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
 
         /* Notify protocols, that we are about to destroy
            this device. They should clean all the things.
+
+           Note that dev->reg_state stays at NETREG_REGISTERED.
+           This is wanted because this way 8021q and macvlan know
+           the device is just moving and can keep their slaves up.
         */
         call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
         call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);