linux-kernel - Re: [PATCH] scsi: csiostor: replace snprintf with sysfs

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Date:   Wed, 9 Feb 2022 11:36:00 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     davidcomponentone@...il.com, jejb@...ux.ibm.com
Cc:     martin.petersen@...cle.com, bvanassche@....org,
        yang.guang5@....com.cn, jiapeng.chong@...ux.alibaba.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] scsi: csiostor: replace snprintf with sysfs_emit

On 2/9/22 09:40, davidcomponentone@...il.com wrote:
> From: Yang Guang <yang.guang5@....com.cn>
> 
> coccinelle report:
> ./drivers/scsi/csiostor/csio_scsi.c:1433:8-16:
> WARNING: use scnprintf or sprintf
> ./drivers/scsi/csiostor/csio_scsi.c:1369:9-17:
> WARNING: use scnprintf or sprintf
> ./drivers/scsi/csiostor/csio_scsi.c:1479:8-16:
> WARNING: use scnprintf or sprintf
> 
> Use sysfs_emit instead of scnprintf or sprintf makes more sense.
> 
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: Yang Guang <yang.guang5@....com.cn>
> Signed-off-by: David Yang <davidcomponentone@...il.com>
> ---
>  drivers/scsi/csiostor/csio_scsi.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/scsi/csiostor/csio_scsi.c b/drivers/scsi/csiostor/csio_scsi.c
> index 55db02521221..f9b87ae2aa25 100644
> --- a/drivers/scsi/csiostor/csio_scsi.c
> +++ b/drivers/scsi/csiostor/csio_scsi.c
> @@ -1366,9 +1366,9 @@ csio_show_hw_state(struct device *dev,
>  	struct csio_hw *hw = csio_lnode_to_hw(ln);
>  
>  	if (csio_is_hw_ready(hw))
> -		return snprintf(buf, PAGE_SIZE, "ready\n");
> +		return sysfs_emit(buf, "ready\n");
>  	else
> -		return snprintf(buf, PAGE_SIZE, "not ready\n");
> +		return sysfs_emit(buf, "not ready\n");

While at it, you could remove the useless "else" above.

>  }
>  
>  /* Device reset */
> @@ -1430,7 +1430,7 @@ csio_show_dbg_level(struct device *dev,
>  {
>  	struct csio_lnode *ln = shost_priv(class_to_shost(dev));
>  
> -	return snprintf(buf, PAGE_SIZE, "%x\n", ln->params.log_level);
> +	return sysfs_emit(buf, "%x\n", ln->params.log_level);
>  }
>  
>  /* Store debug level */
> @@ -1476,7 +1476,7 @@ csio_show_num_reg_rnodes(struct device *dev,
>  {
>  	struct csio_lnode *ln = shost_priv(class_to_shost(dev));
>  
> -	return snprintf(buf, PAGE_SIZE, "%d\n", ln->num_reg_rnodes);
> +	return sysfs_emit(buf, "%d\n", ln->num_reg_rnodes);

num_reg_rnodes is uint32_t so the format should use %u.

>  }
>  
>  static DEVICE_ATTR(num_reg_rnodes, S_IRUGO, csio_show_num_reg_rnodes, NULL);


-- 
Damien Le Moal
Western Digital Research