netdev - Re: [PATCH 1/1] Tell linkwatch about new interfaces

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Date:	Tue, 14 Jul 2009 14:58:06 -0400
From:	Andrew Lutomirski <amluto@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	eeeesti@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] Tell linkwatch about new interfaces

On Tue, Jul 14, 2009 at 2:33 PM, David Miller<davem@...emloft.net> wrote:
> From: Sergio Luis <eeeesti@...il.com>
> Date: Tue, 14 Jul 2009 14:17:21 -0300
>
>> is this patch incorrect, though? with the linkwatch_fire_event() call,
>> the rfc2863 operstate will be set for everyone at device register
>> time.
>
> The issue is dumb drivers that do not manage their link state
> at all.  We want them to always have their links up, from the
> moment they are registered.

Such dumb drivers still end up with bogus operstate.

>
> This is especially important for virtual devices.

$ ip link show lo
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

I've never noticed this causing a problem, but it seems a little
silly.  Presumably lo should be "UP."

--Andy

>
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