From: Veaceslav Falico

Currently we use net_device->name only if it's the NETREG_REGISTERED
reg_state, otherwise we return "(unregistered device)".

However, we always populate net_device->name on creation, so it's always
available to us for use. The only caveat is that we might have a name like
"eth%d", in which case we cannot use it as it might change in the future.

While you've got this code out on the operating table what about:
1) Tracing the renames into the kernel message buffer.
2) Including the original name in some of the kernel traces.

I've been trying to diagnose some issues on a system that renames
its interfaces, and it can get tricky working out which interface
messages refer to.

	David