netdev - Re: [PATCH] igb: fix kexec with igb

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Date:	Fri, 6 Mar 2009 23:18:22 -0800
From:	Jesse Brandeburg <jesse.brandeburg@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	David Miller <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	NetDev <netdev@...r.kernel.org>
Subject: Re: [PATCH] igb: fix kexec with igb

On Fri, Mar 6, 2009 at 8:33 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>
> Impact: could probe igb
>
> Found one system with 82575EB, in the kernel that is kexeced, probe igb
> failed with -2.
>
> it looks like the same behavior happened on forcedeth.
>
> try to check system_state to make sure if put it on D3
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>
> ---
>  drivers/net/igb/igb_main.c |   19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)

I see the point of the patch, but I know for a fact that ixgbe when
enabled for MSI-X also doesn't work with kexec.

so my questions are:
are you going to change every driver?
why can't this be fixed in core kernel code instead?
Shouldn't pci_enable_device take it out of D3?
Or maybe it should be taken out of D3 immediately if someone tries to
ioremap any of the BARx registers?

Jesse
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