netdev - Re: [PATCH] qlcnic: check pci_reset

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Date:   Fri, 31 Mar 2023 19:52:21 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Denis Plotnikov <den-plotnikov@...dex-team.ru>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        shshaikh@...vell.com, manishc@...vell.com,
        GR-Linux-NIC-Dev@...vell.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Subject: Re: [PATCH] qlcnic: check pci_reset_function result

On Fri, Mar 31, 2023 at 11:06:05AM +0300, Denis Plotnikov wrote:
> Static code analyzer complains to unchecked return value.
> It seems that pci_reset_function return something meaningful
> only if "reset_methods" is set.
> Even if reset_methods isn't used check the return value to avoid
> possible bugs leading to undefined behavior in the future.
> 
> Signed-off-by: Denis Plotnikov <den-plotnikov@...dex-team.ru>

nit: The tree this patch is targeted at should be designated, probably
     net-next, so the '[PATCH net-next]' in the subject.

> ---
>  drivers/net/ethernet/qlogic/qlcnic/qlcnic_ctx.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ctx.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ctx.c
> index 87f76bac2e463..39ecfc1a1dbd0 100644
> --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ctx.c
> +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ctx.c
> @@ -628,7 +628,9 @@ int qlcnic_fw_create_ctx(struct qlcnic_adapter *dev)
>  	int i, err, ring;
>  
>  	if (dev->flags & QLCNIC_NEED_FLR) {
> -		pci_reset_function(dev->pdev);
> +		err = pci_reset_function(dev->pdev);
> +		if (err && err != -ENOTTY)

Are you sure about the -ENOTTY part?

It seems odd to me that an FLR would be required but reset is not supported.

> +			return err;
>  		dev->flags &= ~QLCNIC_NEED_FLR;
>  	}
>  
> -- 
> 2.25.1
>