linux-kernel - Re: [PATCH] forcedeth: Fix kexec regression

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Date:	Tue, 19 Aug 2008 22:49:46 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	jgarzik@...hat.com, davem@...emloft.net, yhlu.kernel@...il.com,
	mingo@...e.hu, ebiederm@...ssion.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, jbarnes@...tuousgeek.org, simon@...e.lp0.eu
Subject: Re: [PATCH] forcedeth: Fix kexec regression

On Tuesday, 19 of August 2008, Andrew Morton wrote:
> On Tue, 19 Aug 2008 20:45:53 +0200
> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> 
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > 
> > forcedeth: Fix kexec regression
> > 
> > Fix regression tracked as
> > http://bugzilla.kernel.org/show_bug.cgi?id=11361 and
> > caused by commit f735a2a1a4f2a0f5cd823ce323e82675990469e2
> > ("[netdrvr] forcedeth: setup wake-on-lan before shutting down")
> > that makes network adapters integrated into the NVidia
> > MCP55 chipsets fail to work in kexeced kernels.  The problem appears
> > to be that if the adapter is put into D3_hot during ->shutdown(),
> > it cannot be brought back into D0 after kexec (ref.
> > http://marc.info/?l=linux-kernel&m=121900062814967&w=4).  Therefore,
> > only put forcedeth into D3 during ->shutdown() if the system is to be
> > powered off.
> > 
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> > Tested-by: Yinghai Lu <yhlu.kernel@...il.com>
> > ---
> >  drivers/net/forcedeth.c |    8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> > 
> > Index: linux-2.6/drivers/net/forcedeth.c
> > ===================================================================
> > --- linux-2.6.orig/drivers/net/forcedeth.c
> > +++ linux-2.6/drivers/net/forcedeth.c
> > @@ -5975,10 +5975,12 @@ static void nv_shutdown(struct pci_dev *
> >  	if (netif_running(dev))
> >  		nv_close(dev);
> >  
> > -	pci_enable_wake(pdev, PCI_D3hot, np->wolenabled);
> > -	pci_enable_wake(pdev, PCI_D3cold, np->wolenabled);
> >  	pci_disable_device(pdev);
> > -	pci_set_power_state(pdev, PCI_D3hot);
> > +	if (system_state == SYSTEM_POWER_OFF) {
> > +		if (pci_enable_wake(pdev, PCI_D3cold, np->wolenabled))
> > +			pci_enable_wake(pdev, PCI_D3hot, np->wolenabled);
> > +		pci_set_power_state(pdev, PCI_D3hot);
> > +	}
> >  }
> >  #else
> >  #define nv_suspend NULL
> 
> hm, I wonder if this has any relation to
> forcedeth-add-pci_enable_device-to-nv_resume.patch:

There may be a connection, but we need a confirmation that kexec works on the
affected boxes with MSI disabled.  However, the $subject patch makes sense
even if that's the case IMO.

Anyway, the patch below fixes things for Simon only if MSI are disabled.

> From: Simon Arlott <simon@...e.lp0.eu>
> 
> My NIC stops working after resuming from standby, it's not receiving any
> interrupts.
> 
> Commit 25d90810ff49d2a63475776f24c74c6bb49b045f ([netdrvr] forcedeth:
> reorder suspend/resume code) introduces pci_disable_device to nv_suspend,
> but there's no corresponding pci_enable_device in nv_resume - so I added
> one (copied from e1000).  This results in interrupts being re-enabled
> after suspend.
> 
> However, the NIC (10de:0373) still doesn't work after resume.
> 
> Cc: Tobias Diedrich <ranma+kernel@...edrich.de>
> Cc: Jeff Garzik <jgarzik@...hat.com>
> Cc: Ayaz Abdulla <aabdulla@...dia.com>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
> 
>  drivers/net/forcedeth.c |    7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff -puN drivers/net/forcedeth.c~forcedeth-add-pci_enable_device-to-nv_resume drivers/net/forcedeth.c
> --- a/drivers/net/forcedeth.c~forcedeth-add-pci_enable_device-to-nv_resume
> +++ a/drivers/net/forcedeth.c
> @@ -5960,6 +5960,13 @@ static int nv_resume(struct pci_dev *pde
>  
>  	pci_set_power_state(pdev, PCI_D0);
>  	pci_restore_state(pdev);
> +	rc = pci_enable_device(pdev);
> +	if (rc) {
> +		printk(KERN_ERR "forcedeth: Cannot enable PCI device from suspend\n");
> +		return rc;
> +	}
> +	pci_set_master(pdev);
> +
>  	/* ack any pending wake events, disable PME */
>  	pci_enable_wake(pdev, PCI_D0, 0);
>  
> _
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