linux-kernel - Re: [PATCH v3] scsi: csiostor: convert sysfs snprintf to sysfs

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Date:   Thu, 1 Sep 2022 11:29:30 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Xuezhi Zhang <zhangxuezhi3@...il.com>, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, bvanassche@....org,
        johannes.thumshirn@....com, himanshu.madhani@...cle.com,
        zhangxuezhi1@...lpad.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] scsi: csiostor: convert sysfs snprintf to sysfs_emit

On 9/1/22 10:51, Xuezhi Zhang wrote:
> From: Xuezhi Zhang <zhangxuezhi1@...lpad.com>
> 
> Follow the advice of the Documentation/filesystems/sysfs.rst
> and show() should only use sysfs_emit() or sysfs_emit_at()
> when formatting the value to be returned to user space.
> 
> Signed-off-by: Xuezhi Zhang <zhangxuezhi1@...lpad.com>

Looks OK.

Reviewed-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>

> ---
> v2: delete 'else' and extra space.
> v3: delete extra configs in patch v2
>     and use a new changelog.
> ---
>  drivers/scsi/csiostor/csio_scsi.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/scsi/csiostor/csio_scsi.c b/drivers/scsi/csiostor/csio_scsi.c
> index 9aafe0002ab1..05e1a63e00c3 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");
> -	else
> -		return snprintf(buf, PAGE_SIZE, "not ready\n");
> +		return sysfs_emit(buf, "ready\n");
> +
> +	return sysfs_emit(buf, "not ready\n");
>  }
>  
>  /* 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);
>  }
>  
>  static DEVICE_ATTR(num_reg_rnodes, S_IRUGO, csio_show_num_reg_rnodes, NULL);

-- 
Damien Le Moal
Western Digital Research