linux-kernel - Re: [PATCH] i40e: Fix error handling code of label err_set

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Date:   Tue, 13 Jul 2021 08:16:48 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     Dongliang Mu <mudongliangabcd@...il.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Dinghao Liu <dinghao.liu@....edu.cn>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Shannon Nelson <shannon.nelson@...el.com>,
        Catherine Sullivan <catherine.sullivan@...el.com>
Cc:     intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i40e: Fix error handling code of label err_set_queues

On 7/13/21 5:20 AM, Dongliang Mu wrote:
> If i40e_up_complete fails in i40e_vsi_open, it goes to err_up_complete.
> The label err_set_queues has an issue: if the else branch is executed,
> there is no need to execute i40e_vsi_request_irq.

This is unnecessary: if the else branch is executed then control will 
goto err_setup_rx, skipping over i40e_up_complete().

sln

>
> Fix this by adding a condition of i40e_vsi_free_irq.
>
> Reported-by: Dongliang Mu (mudongliangabcd@...il.com)
> Fixes: 9c04cfcd4aad ("i40e: Fix error handling in i40e_vsi_open")
> Fixes: c22e3c6c7912 ("i40e: prep vsi_open logic for non-netdev cases")
> Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
> ---
>   drivers/net/ethernet/intel/i40e/i40e_main.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
> index 861e59a350bd..ae54468c7001 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -8720,7 +8720,8 @@ int i40e_vsi_open(struct i40e_vsi *vsi)
>   err_up_complete:
>   	i40e_down(vsi);
>   err_set_queues:
> -	i40e_vsi_free_irq(vsi);
> +	if ((vsi->netdev) || (vsi->type == I40E_VSI_FDIR))
> +		i40e_vsi_free_irq(vsi);
>   err_setup_rx:
>   	i40e_vsi_free_rx_resources(vsi);
>   err_setup_tx: