linux-kernel - Re: [PATCH 1/3] PCI PM: Do not disable and enable bridges during suspend-resume

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Message-Id: <200902100121.23552.rjw@sisk.pl>
Date:	Tue, 10 Feb 2009 01:21:22 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@...e.cz>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] PCI PM: Do not disable and enable bridges during suspend-resume

On Monday 09 February 2009, Pavel Machek wrote:
> > On Sunday 08 February 2009, Pavel Machek wrote:
> > > Hi!
> > > 
> > > > > > their standard config spaces are restored.  Fix this by not attempting
> > > > > > to disable bridges during suspend and enable them during resume.
> > > > > ...
> > > > > > @@ -428,16 +428,18 @@ static int pci_pm_default_resume(struct 
> > > > > >  {
> > > > > >  	pci_fixup_device(pci_fixup_resume, pci_dev);
> > > > > >  
> > > > > > -	if (!pci_is_bridge(pci_dev))
> > > > > > -		pci_enable_wake(pci_dev, PCI_D0, false);
> > > > > > +	if (pci_is_bridge(pci_dev))
> > > > > > +		return 0;
> > > > > >  
> > > > > > +	pci_enable_wake(pci_dev, PCI_D0, false);
> > > > > >  	return pci_pm_reenable_device(pci_dev);
> > > > > >  }
> > > > > 
> > > > > Are you sure? This goes from doing reenable_device to not doing it for
> > > > > bridges, seemingly contradicting changelog?
> > > > 
> > > > Can you explain what you mean, please?
> > > 
> > > It looks to me like the patch does not match the changelog.
> > > 
> > > Changelog says "enable bridge during resume", but code does return 0
> > > if it seems bridge.
> > 
> > Ah, I see.  The changelog was supposed to mean that the bridges would not
> > be disabled during suspend and also would not be enabled during resume
> > (which shouldn't be necessary, since they would be automatically enabled
> > as a result of restoring their configuration registers).
> 
> You can add my acked-by: when you resubmit with fixed
> changelog... :-).

It's merged, so that wouldn't be of any use.

Thanks,
Rafael
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