linux-kernel - Re: [PATCH net-next v2 08/11] net/mlx5: devlink health: use retained error fmsg API

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Message-ID: <20231018160855.GT1940501@kernel.org>
Date:   Wed, 18 Oct 2023 18:08:55 +0200
From:   Simon Horman <horms@...nel.org>
To:     Przemek Kitszel <przemyslaw.kitszel@...el.com>
Cc:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Shannon Nelson <shannon.nelson@....com>,
        Michael Chan <michael.chan@...adcom.com>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        George Cherian <george.cherian@...vell.com>,
        Danielle Ratson <danieller@...dia.com>,
        Moshe Shemesh <moshe@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Ariel Elior <aelior@...vell.com>,
        Manish Chopra <manishc@...vell.com>,
        Igor Russkikh <irusskikh@...vell.com>,
        Coiby Xu <coiby.xu@...il.com>,
        Brett Creeley <brett.creeley@....com>,
        Sunil Goutham <sgoutham@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        Geetha sowjanya <gakula@...vell.com>,
        Jerin Jacob <jerinj@...vell.com>,
        hariprasad <hkelam@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>,
        Ido Schimmel <idosch@...dia.com>,
        Petr Machata <petrm@...dia.com>,
        Eran Ben Elisha <eranbe@...dia.com>,
        Aya Levin <ayal@...lanox.com>,
        Leon Romanovsky <leon@...nel.org>,
        linux-kernel@...r.kernel.org,
        Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: Re: [PATCH net-next v2 08/11] net/mlx5: devlink health: use retained
 error fmsg API

On Tue, Oct 17, 2023 at 12:53:38PM +0200, Przemek Kitszel wrote:
> Drop unneeded error checking.
> 
> devlink_fmsg_*() family of functions is now retaining errors,
> so there is no need to check for them after each call.
> 
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>

...

> @@ -288,52 +206,31 @@ int mlx5e_health_rsc_fmsg_dump(struct mlx5e_priv *priv, struct mlx5_rsc_key *key

Hi Przemek,

The code above this hunk looks like this:

        do {
                cmd_err = mlx5_rsc_dump_next(mdev, cmd, page, &size);
                if (cmd_err < 0) {
                        err = cmd_err;

clang-16 W=1 warns that err, which is used as the return value of the
function, will be uninitialised if the loop never hits this condition.

Smatch also warns about this.

>  			goto destroy_cmd;
>  		}
>  
> -		err = mlx5e_health_rsc_fmsg_binary(fmsg, page_address(page), size);
> -		if (err)
> -			goto destroy_cmd;
> -
> +		mlx5e_health_rsc_fmsg_binary(fmsg, page_address(page), size);
>  	} while (cmd_err > 0);
>  
>  destroy_cmd:
>  	mlx5_rsc_dump_cmd_destroy(cmd);
> -	end_err = devlink_fmsg_binary_pair_nest_end(fmsg);
> -	if (end_err)
> -		err = end_err;
> +	devlink_fmsg_binary_pair_nest_end(fmsg);
>  free_page:
>  	__free_page(page);
>  	return err;
>  }

...