linux-kernel - Re: [PATCH net-next v3 08/11] net/mlx5: devlink health: use retained error fmsg API

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Date:   Tue, 24 Oct 2023 15:43:18 +0200
From:   Przemek Kitszel <przemyslaw.kitszel@...el.com>
To:     Dan Carpenter <dan.carpenter@...aro.org>
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>, Simon Horman <horms@...nel.org>,
        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>,
        Jiri Pirko <jiri@...dia.com>
Subject: Re: [PATCH net-next v3 08/11] net/mlx5: devlink health: use retained
 error fmsg API

On 10/24/23 11:50, Dan Carpenter wrote:
> On Wed, Oct 18, 2023 at 10:26:44PM +0200, Przemek Kitszel wrote:
>>   	if (rq->icosq) {
>>   		struct mlx5e_icosq *icosq = rq->icosq;
>>   		u8 icosq_hw_state;
>>   
>> -		err = mlx5_core_query_sq_state(rq->mdev, icosq->sqn, &icosq_hw_state);
>> -		if (err)
>> -			return err;
>> -
>> -		err = mlx5e_reporter_icosq_diagnose(icosq, icosq_hw_state, fmsg);
>> -		if (err)
>> -			return err;
>> +		mlx5_core_query_sq_state(rq->mdev, icosq->sqn, &icosq_hw_state);
> 
> When we remove the error checking then Smatch correctly complains that
> icosq_hw_state is used uninitialized.
> 
>      drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c:268 mlx5e_rx_reporter_build_diagnose_output_rq_common()
>      error: uninitialized symbol 'icosq_hw_state'.
> 
>> +		mlx5e_reporter_icosq_diagnose(icosq, icosq_hw_state, fmsg);
>>   	}
>>   
>>   	return 0;
>>   }
> 
> See also:
>      drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c:229 mlx5e_tx_reporter_build_diagnose_output_sq_common()
>      error: uninitialized symbol 'state'.
> 
> regards,
> dan carpenter

thank you for the report, I will post a fix soon