linux-hardening - Re: [PATCH] igc: Ignore AER reset when device is suspended

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Message-ID: <3d9822ba-e692-e779-3ecb-bb284fa2a733@igalia.com>
Date:   Tue, 20 Jun 2023 12:05:21 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com
Cc:     linux-pci@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Tony Luck <tony.luck@...el.com>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] igc: Ignore AER reset when device is suspended

On 20/06/2023 14:36, Kai-Heng Feng wrote:
> [...]
> So avoid resetting the device if it's not resumed. Once the device is
> fully resumed, the device can work normally.
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=216850
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
>  drivers/net/ethernet/intel/igc/igc_main.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
> index fa764190f270..6a46f886ff43 100644
> --- a/drivers/net/ethernet/intel/igc/igc_main.c
> +++ b/drivers/net/ethernet/intel/igc/igc_main.c
> @@ -6962,6 +6962,9 @@ static pci_ers_result_t igc_io_error_detected(struct pci_dev *pdev,
>  	struct net_device *netdev = pci_get_drvdata(pdev);
>  	struct igc_adapter *adapter = netdev_priv(netdev);
>  
> +	if (!pci_is_enabled(pdev))
> +		return 0;
> +
>  	netif_device_detach(netdev);
>  
>  	if (state == pci_channel_io_perm_failure)

Makes perfect sense to me, based on the days I've worked a lot with PCI
resets and whatnot heh

Feel free to add:
Reviewed-by: Guilherme G. Piccoli <gpiccoli@...lia.com>


Cheers!