From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] atm : fix
 /sys/devices/virtual/atm/X/carrier(ATM_PHY_SIG_UNKNOWN)
Date: Tue, 16 Feb 2010 22:16:51 -0800 (PST)
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From: "Chas Williams (CONTRACTOR)" <chas@cmf.nrl.navy.mil>
Date: Sun, 14 Feb 2010 16:34:40 -0500

> as i said before there is carrier or there is not.  if the driver
> doesnt support checking/knowing the carrier status it should simply
> say 'yes i have carrier'.

I agree %100 and this is how we handle similar situations
for other networking device types.