linux-kernel - Re: [PATCH net-next 1/1] plca.c: fix obvious mistake in checking retval

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Message-ID: <CANn89i+Y-j4RSX7UQO+P6sB9WGsA8ZDb+ruqEv-iJKtzEvGstQ@mail.gmail.com>
Date:   Thu, 12 Jan 2023 15:45:03 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Piergiorgio Beruto <piergiorgio.beruto@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Oleksij Rempel <o.rempel@...gutronix.de>,
        mailhol.vincent@...adoo.fr, sudheer.mogilappagari@...el.com,
        sbhatta@...vell.com, linux-doc@...r.kernel.org,
        wangjie125@...wei.com, corbet@....net, lkp@...el.com,
        gal@...dia.com, gustavoars@...nel.org, bagasdotme@...il.com
Subject: Re: [PATCH net-next 1/1] plca.c: fix obvious mistake in checking retval

On Wed, Jan 11, 2023 at 6:30 PM Piergiorgio Beruto
<piergiorgio.beruto@...il.com> wrote:
>
> This patch addresses a wrong fix that was done during the review
> process. The intention was to substitute "if(ret < 0)" with
> "if(ret)". Unfortunately, in this specific file the intended fix did not
> meet the code.
>

Please add a Fixes: tag, even for a patch in net-next

Fixes: 8580e16c28f3 ("net/ethtool: add netlink interface for the PLCA RS")

> Signed-off-by: Piergiorgio Beruto <piergiorgio.beruto@...il.com>
> ---
>  net/ethtool/plca.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/net/ethtool/plca.c b/net/ethtool/plca.c
> index d9bb13ffc654..9c7d29186b4e 100644
> --- a/net/ethtool/plca.c
> +++ b/net/ethtool/plca.c
> @@ -61,7 +61,7 @@ static int plca_get_cfg_prepare_data(const struct ethnl_req_info *req_base,
>         }
>
>         ret = ethnl_ops_begin(dev);
> -       if (!ret)
> +       if (ret)
>                 goto out;
>
>         memset(&data->plca_cfg, 0xff,
> @@ -151,7 +151,7 @@ int ethnl_set_plca_cfg(struct sk_buff *skb, struct genl_info *info)
>                                          tb[ETHTOOL_A_PLCA_HEADER],
>                                          genl_info_net(info), info->extack,
>                                          true);
> -       if (!ret)

Canonical way of testing an error from ethnl_parse_header_dev_get() is:

if (ret < 0)
    return ret;


Please double check for the rest of the patch (ethnl_ops_begin() ... )


> +       if (ret)
>                 return ret;
>
>         dev = req_info.dev;
> @@ -171,7 +171,7 @@ int ethnl_set_plca_cfg(struct sk_buff *skb, struct genl_info *info)
>         }
>
>         ret = ethnl_ops_begin(dev);
> -       if (!ret)
> +       if (ret)
>                 goto out_rtnl;
>
>         memset(&plca_cfg, 0xff, sizeof(plca_cfg));
> @@ -189,7 +189,7 @@ int ethnl_set_plca_cfg(struct sk_buff *skb, struct genl_info *info)
>                 goto out_ops;
>
>         ret = ops->set_plca_cfg(dev->phydev, &plca_cfg, info->extack);
> -       if (!ret)
> +       if (ret)
>                 goto out_ops;
>
>         ethtool_notify(dev, ETHTOOL_MSG_PLCA_NTF, NULL);
> @@ -233,7 +233,7 @@ static int plca_get_status_prepare_data(const struct ethnl_req_info *req_base,
>         }
>
>         ret = ethnl_ops_begin(dev);
> -       if (!ret)
> +       if (ret)
>                 goto out;
>
>         memset(&data->plca_st, 0xff,
> --
> 2.37.4
>