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

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Date:   Wed, 9 Feb 2022 12:16:27 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Joe Perches <joe@...ches.com>, 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 2022/02/09 12:12, Joe Perches wrote:
> On Wed, 2022-02-09 at 11:36 +0900, Damien Le Moal wrote:
>> 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.
> []
>>> diff --git 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.
> 
> Or not.  It's fine as is.  It's just a style preference.

It is. I dislike the useless line of code in this case :)

> 
> Another style option would be to use a ?: like any of
> 
> 	return sysfs_emit(buf, "%sready\n", csio_is_hw_ready(hw) ? "" : "not ");
> or
> 	return sysfs_emit(buf, "%s\n", csio_is_hw_ready(hw) ? "ready" : "not ready");
> or
> 	return sysfs_emit(buf, csio_is_hw_ready(hw) ? "ready\n" : "not ready\n");

That is nice and can make that
	
	return sysfs_emit(buf, "%sready\n", csio_is_hw_ready(hw) ? "" : "not ");

too :)

-- 
Damien Le Moal
Western Digital Research