From: Andrew Lunn <andrew@lunn.ch>
Date: Thu, 24 Sep 2015 23:57:31 +0200

I built the FEC driver as a module, and it won't unload:

 kernel:unregister_netdevice: waiting for eth1 to become free. Usage count = 1
unregister_netdevice: waiting for eth1 to become free. Usage count = 1

i assume because DSA holds a reference. I've not tried a fully module
build, DSA has issues with that.

Tested-by: Andrew Lunn <andrew@lunn.ch>

So, is this a regression?

Please don't provide a "Tested-by: " tag is you encounter a new
problem which could have been introduced by the changes in question.
That _REALLY_ screws everything up for me.

Thank.