linux-kernel - Re: [PATCH] forcedeth: Fix kexec regression

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Message-ID: <m1od3ow4oi.fsf@frodo.ebiederm.org>
Date:	Wed, 20 Aug 2008 00:01:33 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"Jeff Garzik" <jgarzik@...hat.com>,
	David Miller <davem@...emloft.net>,
	"Yinghai Lu" <yhlu.kernel@...il.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	"Jesse Barnes" <jbarnes@...tuousgeek.org>,
	"Simon Arlott" <simon@...e.lp0.eu>
Subject: Re: [PATCH] forcedeth: Fix kexec regression

"Rafael J. Wysocki" <rjw@...k.pl> writes:

> From: Rafael J. Wysocki <rjw@...k.pl>
>
> forcedeth: Fix kexec regression
>
> Fix regression tracked as
> http://bugzilla.kernel.org/show_bug.cgi?id=11361 and
> caused by commit f735a2a1a4f2a0f5cd823ce323e82675990469e2
> ("[netdrvr] forcedeth: setup wake-on-lan before shutting down")
> that makes network adapters integrated into the NVidia
> MCP55 chipsets fail to work in kexeced kernels.  The problem appears
> to be that if the adapter is put into D3_hot during ->shutdown(),
> it cannot be brought back into D0 after kexec (ref.
> http://marc.info/?l=linux-kernel&m=121900062814967&w=4).  Therefore,
> only put forcedeth into D3 during ->shutdown() if the system is to be
> powered off.

Any chance we can fix this by teaching the forcedeth driver to
bring a card out of PCI_D3hot?

The kexec on panic guys are going to need that and it is just generally
more robust all of the way around than a special case in shutdown
based on system_state.

Eric
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