linux-kernel - Re: [PATCH] Make e100 suspend handler support PCI cards lacking PM capability

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Message-ID: <20090614172022.GA22586@rhlx01.hs-esslingen.de>
Date:	Sun, 14 Jun 2009 19:20:22 +0200
From:	Andreas Mohr <andim2@...rs.sourceforge.net>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	andi@...as.de, akpm@...ux-foundation.org,
	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Make e100 suspend handler support PCI cards lacking PM
	capability

Hi,

On Sun, Jun 14, 2009 at 07:09:45PM +0200, Rafael J. Wysocki wrote:
> On Sunday 14 June 2009, Andreas Mohr wrote:
> > Couple questions still:
> > - why do we call pci_wake_from_d3(...false) only!?
> >   Wouldn't this break WoL after one iteration back and forth,
> >   due to missing 'true' case?
> 
> The 'true' case is the 'wake = true' one.

OK, so it wasn't an explicit pci_wake_from_d3(...true), but the
operations done there are the equivalent of it probably.

> > - why do we call netif_device_detach() _after_ doing hardware shutdown
> >   of the network controller? I'd guess this can cause huge issues?
> >   Someone told me he had rtnl lock issues upon S2D with e100
> >   (very similar to my rtnl issues during aborted .suspend),
> >   and that might possibly be the reason?
> 
> I think you're right, but I'm not a network driver expert.
> 
> Perhaps you can change the ordering and see if that fixes the rtnl issue
> (since you're able to reproduce it without my patch, that should be easy to
> verify).

I'll test this - later.

Thanks a lot,

Andreas Mohr
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