netdev - Re: [PATCH] phylib: Fix auto-negotiation restart avoidance

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Date:	Wed, 19 Nov 2008 15:52:17 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	tpiepho@...escale.com
Cc:	netdev@...r.kernel.org, scottwood@...escale.com,
	afleming@...escale.com
Subject: Re: [PATCH] phylib: Fix auto-negotiation restart avoidance

From: Trent Piepho <tpiepho@...escale.com>
Date: Mon, 17 Nov 2008 13:33:25 -0800

> A previous patch, 51e2a3846eab18711f4eb59cd0a4c33054e2980a, made
> genphy_config_aneg() not restart aneg by calling genphy_restart_aneg() if
> the advertisement hadn't changed.
> 
> But, genphy_restart_aneg() doesn't just restart aneg, it may also *enable*
> aneg or un-isolate the PHY from the MII (those functions are controlled by
> the same register).  The code to avoid calling genphy_restart_aneg() didn't
> consider this.
> 
> So, modify genphy_config_aneg() to also check if the PHY needs to have aneg
> enabled or be un-isolated before deciding not to restart aneg.
> 
> This caused a problem with certain Davicom PHYs, as that driver isolates
> the PHY (why?) before calling genphy_config_aneg() and expects the PHY to
> be un-isolated by that function.
> 
> Signed-off-by: Trent Piepho <tpiepho@...escale.com>
> Reported-by: Scott Wood <scottwood@...escale.com>
> CC: Andy Fleming <afleming@...escale.com>
> ---
> This fixes a 2.6.28 regression.

I'll apply this, thanks a lot.
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