From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Brownell <david-b@pacbell.net>
Subject: Re: Patch: Idea for RFC2863 conform OperStatus
Date: Mon, 14 Oct 2002 12:03:56 -0700
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To: Stefan Rompf <srompf@isg.de>, jamal <hadi@cyberus.ca>
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> Right now almost all USB networking drivers make the device disappear
> immediately ... certainly the ones that have made sure they handle the
> USB disconnect processing correctly (no more I/O to that device!) tend
> to do that, by calling unregister_netdev().

... which would let Linux implement a NotPresent(ifname) test
just by seeing if it's registered, unless that RFC demands some
more abstruse meaning.  (I've not read it lately.)