linux-kernel - Re: [PATCH] net/mlx5e: Fix an error code in mlx5e_arfs_create

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Date:   Wed, 2 Jun 2021 19:49:19 +0800
From:   Mark Zhang <markzhang@...dia.com>
To:     Yang Li <yang.lee@...ux.alibaba.com>, <saeedm@...dia.com>
CC:     <leon@...nel.org>, <davem@...emloft.net>, <kuba@...nel.org>,
        <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net/mlx5e: Fix an error code in
 mlx5e_arfs_create_tables()

On 6/2/2021 6:09 PM, Yang Li wrote:
> When the code execute 'if (!priv->fs.arfs->wq)', the value of err is 0.
> So, we use -ENOMEM to indicate that the function
> create_singlethread_workqueue() return NULL.
> 
> Clean up smatch warning:
> drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c:373
> mlx5e_arfs_create_tables() warn: missing error code 'err'.
> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Fixes: 'commit f6755b80d693 ("net/mlx5e: Dynamic alloc arfs table for netdev when needed")'
> Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>
> ---
>   drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c b/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
> index 5cd466e..2949437 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
> @@ -369,8 +369,10 @@ int mlx5e_arfs_create_tables(struct mlx5e_priv *priv)
>   	spin_lock_init(&priv->fs.arfs->arfs_lock);
>   	INIT_LIST_HEAD(&priv->fs.arfs->rules);
>   	priv->fs.arfs->wq = create_singlethread_workqueue("mlx5e_arfs");
> -	if (!priv->fs.arfs->wq)
> +	if (!priv->fs.arfs->wq) {
> +		err = -ENOMEM;
>   		goto err;
> +	}
>   
>   	for (i = 0; i < ARFS_NUM_TYPES; i++) {
>   		err = arfs_create_table(priv, i);

Maybe also need to "destroy_workqueue(priv->fs.arfs->wq);" in err_des.