linux-kernel - Re: [PATCH] ipmi/watchdog: add missing newlines when printing parameters by sysfs

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Message-ID: <70f4a8b9-1410-a32d-dfaa-4cb5d3cade10@huawei.com>
Date:   Tue, 21 Jul 2020 14:17:40 +0800
From:   Xiongfeng Wang <wangxiongfeng2@...wei.com>
To:     Joe Perches <joe@...ches.com>, <minyard@....org>
CC:     <arnd@...db.de>, <gregkh@...uxfoundation.org>,
        <openipmi-developer@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <guohanjun@...wei.com>
Subject: Re: [PATCH] ipmi/watchdog: add missing newlines when printing
 parameters by sysfs



On 2020/7/21 10:00, Joe Perches wrote:
> On Tue, 2020-07-21 at 09:20 +0800, Xiongfeng Wang wrote:
>> On 2020/7/21 3:52, Corey Minyard wrote:
>>> On Mon, Jul 20, 2020 at 10:03:25AM +0800, Xiongfeng Wang wrote:
>>>> When I cat some ipmi_watchdog parameters by sysfs, it displays as
>>>> follows. It's better to add a newline for easy reading.
> []
>>>> diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
> []
>>>> @@ -232,12 +232,16 @@ static int set_param_str(const char *val, const struct kernel_param *kp)
>>>>  static int get_param_str(char *buffer, const struct kernel_param *kp)
>>>>  {
>>>>  	action_fn fn = (action_fn) kp->arg;
>>>> -	int       rv;
>>>> +	int rv, len;
>>>>  
>>>>  	rv = fn(NULL, buffer);
>>>>  	if (rv)
>>>>  		return rv;
>>>> -	return strlen(buffer);
>>>> +
>>>> +	len = strlen(buffer);
>>>> +	len += sprintf(buffer + len, "\n");
>>>
>>> sprintf is kind of overkill to stick a \n on the end of a line.  How
>>> about:
>>>
>>> 	buffer[len++] = '\n';
>>>
>>> Since you are returning the length, you shouldn't need to nil terminate
>>> the string.
> 
> You never quite know for sure so I suggest making
> the string null terminated just in case.
> 
> i.e.:
> 
> 	buffer[len++] = '\n';
> 	buffer[len] = 0;
> 

Thanks for your advice. I will change it in the next version.

Thanks,
Xiongfeng

> 
> 
> .
>