linux-kernel - Re: [PATCH] net: forcedeth use pci_choose_state instead of PCI_D3hot

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Date:	Sun, 17 Aug 2008 18:55:57 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Jeff Garzik <jgarzik@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: forcedeth use pci_choose_state instead of PCI_D3hot - v2

On Sunday, 17 of August 2008, Rafael J. Wysocki wrote:
> On Sunday, 17 of August 2008, Yinghai Lu wrote:
> > after
> > 
> > | commit f735a2a1a4f2a0f5cd823ce323e82675990469e2
> > | Author: Tobias Diedrich <ranma+kernel@...edrich.de>
> > | Date:   Sun May 18 15:02:37 2008 +0200
> > |
> > |    [netdrvr] forcedeth: setup wake-on-lan before shutting down
> > |
> > |    When hibernating in 'shutdown' mode, after saving the image the suspend hook
> > |    is not called again.
> > |    However, if the device is in promiscous mode, wake-on-lan will not work.
> > |    This adds a shutdown hook to setup wake-on-lan before the final shutdown.
> > |
> > |    Signed-off-by: Tobias Diedrich <ranma+kernel@...edrich.de>
> > |    Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
> > 
> > my servers with nvidia mcp55 nic doesn't work with msi in second kernel by kexec
> > 
> > after remove pci_set_power_state(, PCI_D3hot) that nic/msi will work again.
> > 
> > check with e1000 is using pci_choose_state in _shutdown.

This is wrong.

> > So change that pci_choose_state(pdev, ...), and it works.
> 
> Well, this doesn't look like a good solution to me, because you're putting
> PMSG_SUSPEND in there, which is not correct for shutdown.  The right thing to
> do would be to avoid changing the device power state if nv_shutdown() is
> used for kexec or to rework the initialization of the adapter to handle the
> case when it's initially in D3.
> 
> Does it help if you just remove the pci_set_power_state(pdev, PCI_D3hot)
> altogether?

Ah, sorry.  I see it does.

Actually, I think you can use pci_prepare_to_sleep() instead of
pci_enable_wake() / pci_set_power_state() combo.  It wasn't designed for this
purpose, but should work nevertheless.

Can you please check if the appended patch works instead of your one?

Rafael

---
Fix the problem that boxes with NVidia MCP55 don't work with MSI
in a kexeced kernel.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/net/forcedeth.c |    4 +---
 1 file changed, 1 insertion(+), 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 +5975,8 @@ 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);
+	pci_prepare_to_sleep(pdev);
 }
 #else
 #define nv_suspend NULL

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