netdev - Re: [PATCH] sky2: set carrier off in probe

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Date:	Fri, 30 Oct 2009 11:20:51 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	bphilips@...e.de, shemminger@...ux-foundation.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] sky2: set carrier off in probe

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Fri, 30 Oct 2009 14:16:32 -0400

> On Fri, Oct 30, 2009 at 11:10:27AM -0700, David Miller wrote:
> . 
>> Because the driver must start in state with carrier off anyways,
>> so that we get the transition event when the device comes up
>> from link down to link up.
> 
> Well we want all drivers to start in state NOCARRIER.  However,
> a freshly allocated netdev has the NOCARRIER bit off.  This means
> every single driver has to set the NOCARRIER bit.
> 
> It would seem much easier to ensure that the NOCARRIER bit is set
> in a newly allocated netdev.

Since many drivers (especially virtual software ones) do not manage
carrier state and therefore that's why we start in state carrier on.

We've had this discussion a few times before, most recently with
Rusty wrt. virtio :-)
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