linux-kernel - Re: [PATCH net-next] net/mlx5e: Remove NULL check before dev

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Message-ID: <ZCb/wM+2Bz7HvFxl@corigine.com>
Date:   Fri, 31 Mar 2023 17:44:00 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Yang Li <yang.lee@...ux.alibaba.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, saeedm@...dia.com, leon@...nel.org,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, Abaci Robot <abaci@...ux.alibaba.com>
Subject: Re: [PATCH net-next] net/mlx5e: Remove NULL check before dev_{put,
 hold}

On Fri, Mar 31, 2023 at 08:57:18AM +0800, Yang Li wrote:
> The call netdev_{put, hold} of dev_{put, hold} will check NULL,
> so there is no need to check before using dev_{put, hold},
> remove it to silence the warnings:
> 
> ./drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c:734:2-9: WARNING: NULL check before dev_{put, hold} functions is not needed.
> ./drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c:769:2-9: WARNING: NULL check before dev_{put, hold} functions is not needed.
> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=4667
> Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>

Looks good, but I think you missed the one in mlx5e_set_int_port_tunnel().

> ---
>  drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
> index 20c2d2ecaf93..69ac30a728f4 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
> @@ -730,8 +730,7 @@ static int mlx5e_set_vf_tunnel(struct mlx5_eswitch *esw,
>  	}
>  
>  out:
> -	if (route_dev)
> -		dev_put(route_dev);
> +	dev_put(route_dev);
>  	return err;
>  }
>  
> @@ -765,8 +764,7 @@ static int mlx5e_update_vf_tunnel(struct mlx5_eswitch *esw,
>  	mlx5e_tc_match_to_reg_mod_hdr_change(esw->dev, mod_hdr_acts, VPORT_TO_REG, act_id, data);
>  
>  out:
> -	if (route_dev)
> -		dev_put(route_dev);
> +	dev_put(route_dev);
>  	return err;
>  }
>  
> -- 
> 2.20.1.7.g153144c
>