linux-kernel - Re: [PATCH v2] net:Fix an NULL vs IS_ERR() bug for debugfs_create_dir() in i40e_dbg

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Date:   Wed, 12 Jul 2023 13:57:25 -0700
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     Wang Ming <machel@...o.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <opensource.kernel@...o.com>
Subject: Re: [PATCH v2] net:Fix an NULL vs IS_ERR() bug for
 debugfs_create_dir() in i40e_dbg_init()

On 7/12/2023 5:19 AM, Wang Ming wrote:

Please designate a tree for the patch (net or net-next) [1].

If you could include the driver (i40e) in the commit title as well. 
Also, a nit, but the title is a bit long, seems like it could be a bit 
more succinct.

> The debugfs_create_dir() function returns error pointers.
> It never returns NULL. Most incorrect error checks were fixed,
> but the one in i40e_dbg_init() was forgotten.
> 
> Fix the remaining error check.

As it's a fix, there should be a Fixes tag as well.

> Signed-off-by: Wang Ming <machel@...o.com>
> ---
>   drivers/net/ethernet/intel/i40e/i40e_debugfs.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
> index 9954493cd448..62497f5565c5 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
> @@ -1839,7 +1839,7 @@ void i40e_dbg_pf_exit(struct i40e_pf *pf)
>   void i40e_dbg_init(void)
>   {
>   	i40e_dbg_root = debugfs_create_dir(i40e_driver_name, NULL);
> -	if (!i40e_dbg_root)
> +	if (IS_ERR(i40e_dbg_root))
>   		pr_info("init of debugfs failed\n");
>   }
>   

[1] 
https://www.kernel.org/doc/html/latest/process/maintainer-netdev.html#netdev-faq