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

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Message-Id: <200808171502.02946.rjw@sisk.pl>
Date:	Sun, 17 Aug 2008 15:02:01 +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, 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.
> 
> 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?

> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
> 
> ---
>  drivers/net/forcedeth.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6/drivers/net/forcedeth.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/forcedeth.c
> +++ linux-2.6/drivers/net/forcedeth.c
> @@ -5988,7 +5988,7 @@ static void nv_shutdown(struct pci_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_set_power_state(pdev, pci_choose_state(pdev, PMSG_SUSPEND));
>  }
>  #else
>  #define nv_suspend NULL

Thanks,
Rafael
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