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

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Message-Id: <200902071448.13877.rjw@sisk.pl>
Date:	Sat, 7 Feb 2009 14:48:13 +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 Saturday 07 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.
> 
> ...
> 
> > Index: linux-2.6/drivers/pci/pci-driver.c
> > ===================================================================
> > --- linux-2.6.orig/drivers/pci/pci-driver.c
> > +++ linux-2.6/drivers/pci/pci-driver.c
> > @@ -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?

Thanks,
Rafael
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