netdev - Re: [PATCH -next] i40e: Replace sscanf() with kstrtoint() in i40e_dbg_netdev_ops

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Message-ID: <ed0119ac-c69b-4840-afa4-ab77a195d36f@intel.com>
Date: Mon, 27 Oct 2025 10:40:15 +0100
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Wang Liang <wangliang74@...wei.com>
CC: <intel-wired-lan@...ts.osuosl.org>, <anthony.l.nguyen@...el.com>,
	<andrew+netdev@...n.ch>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <yuehaibing@...wei.com>,
	<zhangchangzhong@...wei.com>
Subject: Re: [PATCH -next] i40e: Replace sscanf() with kstrtoint() in
 i40e_dbg_netdev_ops_write()

On 10/25/25 06:07, Wang Liang wrote:
> Commit 9fcdb1c3c4ba ("i40e: remove read access to debugfs files")
> introduced some checkpatch warnings like this:
> 
>    WARNING: Prefer kstrto<type> to single variable sscanf
>    #240: FILE: drivers/net/ethernet/intel/i40e/i40e_debugfs.c:1655:
>    +               cnt = sscanf(&cmd_buf[11], "%i", &vsi_seid);
> 
>    WARNING: Prefer kstrto<type> to single variable sscanf
>    #251: FILE: drivers/net/ethernet/intel/i40e/i40e_debugfs.c:1676:
>    +               cnt = sscanf(&cmd_buf[4], "%i", &vsi_seid);
> 
>    total: 0 errors, 2 warnings, 0 checks, 194 lines checked
> 
> Function kstrtoint() provides better error detection, overflow protection,
> and consistent error handling than sscanf(). Replace sscanf() with
> kstrtoint() in i40e_dbg_netdev_ops_write() to silence the checkpatch
> warnings.
> 

sorry, we do not accept trivial patches, that are not a part of some
broader work related to the driver
https://docs.kernel.org/process/maintainer-netdev.html#clean-up-patches


> Signed-off-by: Wang Liang <wangliang74@...wei.com>
> ---
>   drivers/net/ethernet/intel/i40e/i40e_debugfs.c | 14 +++++++-------
>   1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
> index c17b5d290f0a..2abd12b62509 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
> @@ -1604,7 +1604,7 @@ static ssize_t i40e_dbg_netdev_ops_write(struct file *filp,
>   	int bytes_not_copied;
>   	struct i40e_vsi *vsi;
>   	int vsi_seid;
> -	int i, cnt;
> +	int i, ret;
>   
>   	/* don't allow partial writes */
>   	if (*ppos != 0)
> @@ -1629,9 +1629,9 @@ static ssize_t i40e_dbg_netdev_ops_write(struct file *filp,
>   	if (strncmp(cmd_buf, "change_mtu", 10) == 0) {
>   		int mtu;
>   
> -		cnt = sscanf(&cmd_buf[11], "%i %i",
> +		ret = sscanf(&cmd_buf[11], "%i %i",
>   			     &vsi_seid, &mtu);
> -		if (cnt != 2) {
> +		if (ret != 2) {
>   			dev_info(&pf->pdev->dev, "change_mtu <vsi_seid> <mtu>\n");
>   			goto netdev_ops_write_done;
>   		}
> @@ -1652,8 +1652,8 @@ static ssize_t i40e_dbg_netdev_ops_write(struct file *filp,
>   		}
>   
>   	} else if (strncmp(cmd_buf, "set_rx_mode", 11) == 0) {
> -		cnt = sscanf(&cmd_buf[11], "%i", &vsi_seid);
> -		if (cnt != 1) {
> +		ret = kstrtoint(&cmd_buf[11], 0, &vsi_seid);
> +		if (ret) {
>   			dev_info(&pf->pdev->dev, "set_rx_mode <vsi_seid>\n");
>   			goto netdev_ops_write_done;
>   		}
> @@ -1673,8 +1673,8 @@ static ssize_t i40e_dbg_netdev_ops_write(struct file *filp,
>   		}
>   
>   	} else if (strncmp(cmd_buf, "napi", 4) == 0) {
> -		cnt = sscanf(&cmd_buf[4], "%i", &vsi_seid);
> -		if (cnt != 1) {
> +		ret = kstrtoint(&cmd_buf[4], 0, &vsi_seid);
> +		if (ret) {
>   			dev_info(&pf->pdev->dev, "napi <vsi_seid>\n");
>   			goto netdev_ops_write_done;
>   		}