linux-kernel - Re: [PATCH] net/mlx5: Use kasprintf instead of hand-writing it

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Date:   Sun, 18 Apr 2021 13:03:53 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        saeedm@...dia.com, leon@...nel.org, davem@...emloft.net,
        kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] net/mlx5: Use kasprintf instead of hand-writing it

On 4/17/21 12:16 AM, Christophe JAILLET wrote:
> 'kasprintf()' can replace a kmalloc/strcpy/strcat sequence.
> It is less verbose and avoid the use of a magic number (64).
> 
> Anyway, the underlying 'alloc_workqueue()' would only keep the 24 first
> chars (i.e. sizeof(struct workqueue_struct->name) = WQ_NAME_LEN).
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/health.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/health.c b/drivers/net/ethernet/mellanox/mlx5/core/health.c
> index 9ff163c5bcde..a5383e701b4b 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/health.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/health.c
> @@ -802,12 +802,10 @@ int mlx5_health_init(struct mlx5_core_dev *dev)
>  	mlx5_fw_reporters_create(dev);
>  
>  	health = &dev->priv.health;
> -	name = kmalloc(64, GFP_KERNEL);
> +	name = kasprintf(GFP_KERNEL, "mlx5_health%s", dev_name(dev->device));
>  	if (!name)
>  		goto out_err;
>  
> -	strcpy(name, "mlx5_health");
> -	strcat(name, dev_name(dev->device));
>  	health->wq = create_singlethread_workqueue(name);
>  	kfree(name);
>  	if (!health->wq)

Instead of modifying the mlx5 driver, please change the definition of
the create_singlethread_workqueue() such that it accept a format
specifier and a variable number of arguments.

Thanks,

Bart.