linux-kernel - Re: [PATCH 1/5] e1000e: fix resuming from runtime-suspend

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Message-ID: <4689665.USakedKCym@vostro.rjw.lan>
Date:	Thu, 31 Jan 2013 02:23:27 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	linux-kernel@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	linux-pci@...r.kernel.org, Bruce Allan <bruce.w.allan@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: Re: [PATCH 1/5] e1000e: fix resuming from runtime-suspend

On Friday, January 18, 2013 03:42:14 PM Konstantin Khlebnikov wrote:
> Bug was introduced in commit 23606cf5d1192c2b17912cb2ef6e62f9b11de133
> ("e1000e / PCI / PM: Add basic runtime PM support (rev. 4)") in v2.6.35
> 
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
> Cc: e1000-devel@...ts.sourceforge.net
> Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> Cc: Bruce Allan <bruce.w.allan@...el.com>
> ---
>  drivers/net/ethernet/intel/e1000e/netdev.c |   13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
> index fbf75fd..2853c11 100644
> --- a/drivers/net/ethernet/intel/e1000e/netdev.c
> +++ b/drivers/net/ethernet/intel/e1000e/netdev.c
> @@ -5691,14 +5691,17 @@ static int e1000_runtime_suspend(struct device *dev)
>  	struct pci_dev *pdev = to_pci_dev(dev);
>  	struct net_device *netdev = pci_get_drvdata(pdev);
>  	struct e1000_adapter *adapter = netdev_priv(netdev);
> +	int retval;
> +	bool wake;
>  
> -	if (e1000e_pm_ready(adapter)) {
> -		bool wake;
> +	if (!e1000e_pm_ready(adapter))
> +		return 0;
>  
> -		__e1000_shutdown(pdev, &wake, true);
> -	}
> +	retval = __e1000_shutdown(pdev, &wake, true);
> +	if (!retval)
> +		e1000_power_off(pdev, true, wake);

That needs to be pci_finish_runtime_suspend() (which needs to be exported
for this purpose) or remove the pci_save_state() from __e1000_shutdown().

If the latter works, I'd very much prefer it.

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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