From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <shemminger@vyatta.com>
Subject: Re: locking in net_device_ops callbacks
Date: Wed, 21 Mar 2012 16:00:13 -0700
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Another part of this is that it is not allowed to change many settings
like name, mac address or master relationship if device is UP.