linux-kernel - Re: 2.6.29-rc3: tg3 dead after resume

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Date:	Sat, 31 Jan 2009 00:31:36 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Parag Warudkar <parag.lkml@...il.com>
Cc:	Matt Carlson <mcarlson@...adcom.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: 2.6.29-rc3: tg3 dead after resume

On Saturday 31 January 2009, Parag Warudkar wrote:
> 
> On Fri, 30 Jan 2009, Rafael J. Wysocki wrote:
> 
> > On Friday 30 January 2009, Parag Warudkar wrote:
> > > 
> > > On Fri, 30 Jan 2009, Rafael J. Wysocki wrote:
> > > 
> > > > 
> > > > I still am interested if it makes any difference for Parag.
> > > 
> > > No difference - tg3 is still dead after resume.
> > 
> > Thanks for testing.
> > 
> > Well, I'm not sure if tg3 is at fault, really.
> > 
> > What happens if you unload tg3 before suspend and load it back after the
> > resume?
> 
> This time it fails with different error on loading after suspend/resume 
> cycle -
> 
>  1196.873608] tg3 0000:0e:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
> [ 1196.873620] tg3 0000:0e:00.0: setting latency timer to 64
> [ 1196.880017] tg3 0000:0e:00.0: PME# disabled
> [ 1196.996270] tg3: (0000:0e:00.0) phy probe failed, err -19
> [ 1197.508033] tg3: Problem fetching invariants of chip, aborting.
> [ 1197.508048] tg3 0000:0e:00.0: PCI INT A disabled

It seems like something between the tg3 chip and the host CPU doesn't work
correctly after resume, Linus is right.

I wonder if this change makes any difference:

--- linux-2.6.orig/drivers/pci/pci-driver.c
+++ linux-2.6/drivers/pci/pci-driver.c
@@ -501,6 +501,9 @@ static int pci_pm_suspend(struct device
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend(dev, PMSG_SUSPEND);
 
+	if (!drv || !drv->pm)
+		return 0;
+
 	if (drv && drv->pm && drv->pm->suspend) {
 		error = drv->pm->suspend(dev);
 		suspend_report_result(drv->pm->suspend, error);


Rafael
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