linux-kernel - Re: [PATCH -next] mlxsw: spectrum_acl_tcam: simplify the return expression of ishtp_cl_driver

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Date:   Tue, 22 Sep 2020 09:48:48 +0800
From:   miaoqinglang <miaoqinglang@...wei.com>
To:     Ido Schimmel <idosch@...dia.com>
CC:     Jiri Pirko <jiri@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] mlxsw: spectrum_acl_tcam: simplify the return
 expression of ishtp_cl_driver_register()



在 2020/9/21 21:51, Ido Schimmel 写道:
> On Mon, Sep 21, 2020 at 09:10:39PM +0800, Qinglang Miao wrote:
>> Simplify the return expression.
>>
>> Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
>> ---
>>   drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c | 8 +-------
>>   1 file changed, 1 insertion(+), 7 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
>> index 5c0204033..5b4313991 100644
>> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
>> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
>> @@ -289,17 +289,11 @@ static int
>>   mlxsw_sp_acl_tcam_group_add(struct mlxsw_sp_acl_tcam *tcam,
>>   			    struct mlxsw_sp_acl_tcam_group *group)
>>   {
>> -	int err;
>> -
>>   	group->tcam = tcam;
>>   	mutex_init(&group->lock);
>>   	INIT_LIST_HEAD(&group->region_list);
>>   
>> -	err = mlxsw_sp_acl_tcam_group_id_get(tcam, &group->id);
>> -	if (err)
>> -		return err;
>> -
>> -	return 0;
>> +	return mlxsw_sp_acl_tcam_group_id_get(tcam, &group->id);

> There is actually a problem here. We don't call mutex_destroy() on
> error. Should be:
> 
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
> index 5c020403342f..7cccc41dd69c 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
> @@ -292,13 +292,14 @@ mlxsw_sp_acl_tcam_group_add(struct mlxsw_sp_acl_tcam *tcam,
>          int err;
>   
>          group->tcam = tcam;
> -       mutex_init(&group->lock);
>          INIT_LIST_HEAD(&group->region_list);
>   
>          err = mlxsw_sp_acl_tcam_group_id_get(tcam, &group->id);
>          if (err)
>                  return err;
>   
> +       mutex_init(&group->lock);
> +
>          return 0;
>   }
> 
> Then it's symmetric with mlxsw_sp_acl_tcam_group_del(). Do you want to
> send this patch to 'net' or should I? If so, it should have this Fixes
> line:
> 
> Fixes: 5ec2ee28d27b ("mlxsw: spectrum_acl: Introduce a mutex to guard region list updates")
> 
> Thanks
> 
Hi Ido,

Sorry I didn't realize this problem. As for this bugfix patch, I think 
there's no doubt that you are the one who should send it :D.

Thanks.

>>   }
>>   
>>   static void mlxsw_sp_acl_tcam_group_del(struct mlxsw_sp_acl_tcam_group *group)
>> -- 
>> 2.23.0
>>
> .
>