netdev - Re: [PATCH] forcedeth: Fix kexec regression

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Message-Id: <20080819133757.ce60f364.akpm@linux-foundation.org>
Date:	Tue, 19 Aug 2008 13:37:57 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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 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:


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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