linux-kernel - Re: [PATCH v2] net/mlx5: Fix missing return value in mlx5_devlink_eswitch_inline_mode

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Date:   Mon, 26 Jul 2021 15:47:13 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc:     leon@...nel.org, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net/mlx5: Fix missing return value in
 mlx5_devlink_eswitch_inline_mode_set()

On Thu, 2021-07-22 at 17:58 +0800, Jiapeng Chong wrote:
> The return value is missing in this code scenario, add the return
> value
> '0' to the return value 'err'.
> 
> Eliminate the follow smatch warning:
> 
> drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c:3083
> mlx5_devlink_eswitch_inline_mode_set() warn: missing error code
> 'err'.
> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Fixes: 8e0aa4bc959c ("net/mlx5: E-switch, Protect eswitch mode
> changes")
> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
> ---
> Changes in v2:
>   -For the follow advice:
> https://lore.kernel.org/patchwork/patch/1461601/
> 
>  drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git
> a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
> b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
> index 7579f34..6b0b629 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
> @@ -3079,8 +3079,11 @@ int
> mlx5_devlink_eswitch_inline_mode_set(struct devlink *devlink, u8
> mode,
>  
>         switch (MLX5_CAP_ETH(dev, wqe_inline_mode)) {
>         case MLX5_CAP_INLINE_MODE_NOT_REQUIRED:
> -               if (mode == DEVLINK_ESWITCH_INLINE_MODE_NONE)
> +               if (mode == DEVLINK_ESWITCH_INLINE_MODE_NONE) {
> +                       err = 0;

Although err is already 0 at this point even before this patch,
otherwise the function would've aborted earlier, I will apply this to
net-next-mlx5, since I like the explicit return value here as it shows
the real intention of the code.
but smatch needs to be investigated.

Applied to net-next-mlx5, 
Thanks.

>                         goto out;
> +               }
> +
>                 fallthrough;
>         case MLX5_CAP_INLINE_MODE_L2:
>                 NL_SET_ERR_MSG_MOD(extack, "Inline mode can't be
> set");