Re: [PATCH net] ip[6]: don't register inet[6]dev when dev is down

On Wed, Jul 5, 2017 at 8:57 AM, Nicolas Dichtel
[off-list ref] wrote:

When a device changes from one netns to another, it's first unregistered,
then the netns reference is updated and the dev is registered in the new
netns. Thus, when a slave moves to another netns, it is first
unregistered. This triggers a NETDEV_UNREGISTER event which is caught by
the bonding driver. The driver calls bond_release(), which calls
dev_set_mtu() and thus triggers NETDEV_CHANGEMTU (the device is still in
the old netns).

I think in this special case it is meaningless to send
NETDEV_CHANGEMTU, because the device is dying within
its old netns, who still cares about its mtu change?

Something like the attached patch...