netdev - Re: [net-next 07/16] i40e: Save PCI state before suspend

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Date:	Wed, 29 Jun 2016 07:49:21 -0700
From:	Greg <gvrose8192@...il.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	davem@...emloft.net, Greg Rose <gregory.v.rose@...el.com>,
	netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
	jogreene@...hat.com
Subject: Re: [net-next 07/16] i40e: Save PCI state before suspend

On Tue, 2016-06-28 at 21:40 -0700, Jeff Kirsher wrote:
> From: Greg Rose <gregory.v.rose@...el.com>
> 
> The i40e_suspend() function was failing to save PCI state
> and this would result in a kernel stack trace from a WARN_ONCE in the
> pci_legacy_suspend() function.
> 
> Add a call to pci_save_state() to fix that problem.
> 
> Change-ID: I4736e62bb660966bd208cc8af617a14cb07fc4bd
> Signed-off-by: Greg Rose <gregory.v.rose@...el.com>
> Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Acked-by: Greg Rose <grose@...htfleet.com>

:)

> ---
>  drivers/net/ethernet/intel/i40e/i40e_main.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
> index e071c22..52d9d28 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -11441,6 +11441,7 @@ static int i40e_suspend(struct pci_dev *pdev, pm_message_t state)
>  {
>  	struct i40e_pf *pf = pci_get_drvdata(pdev);
>  	struct i40e_hw *hw = &pf->hw;
> +	int retval = 0;
>  
>  	set_bit(__I40E_SUSPENDED, &pf->state);
>  	set_bit(__I40E_DOWN, &pf->state);
> @@ -11454,10 +11455,14 @@ static int i40e_suspend(struct pci_dev *pdev, pm_message_t state)
>  
>  	i40e_stop_misc_vector(pf);
>  
> +	retval = pci_save_state(pdev);
> +	if (retval)
> +		return retval;
> +
>  	pci_wake_from_d3(pdev, pf->wol_en);
>  	pci_set_power_state(pdev, PCI_D3hot);
>  
> -	return 0;
> +	return retval;
>  }
>  
>  /**