[brussels-dev] Is replumb sufficient to change the mtu property?

[Artem Kachitchkine]

> so it may be that the mi_ref is getting scribbled on somewhere else. 

It's worth investigating, but might not be related to this particular 
issue. Detaching a driver instance is not the only way to change MTU. 
bge_m_setprop(DLD_PROP_DEFMTU) only returns EBUSY when 
bgep->bge_mac_state == BGE_MAC_STARTED. If you stop the mac then call 
mi_setprop, it should reinitialize with the the value. I think we should 
work this angle first.

-Artem