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

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Date:   Mon, 21 Sep 2020 16:51:58 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     Qinglang Miao <miaoqinglang@...wei.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()

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

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