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

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Date:   Tue, 21 Jul 2020 09:20:17 +0800
From:   Xiongfeng Wang <wangxiongfeng2@...wei.com>
To:     <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

Hi Corey,

Thanks for your reply !

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.
>>
>> root@(none):/# cat /sys/module/ipmi_watchdog/parameters/action
>> resetroot@(none):/# cat /sys/module/ipmi_watchdog/parameters/preaction
>> pre_noneroot@(none):/# cat /sys/module/ipmi_watchdog/parameters/preop
>> preop_noneroot@(none):/#
> 
> Yeah, that's not consistent with other things displayed in the kernel.
> 
>>
>> Signed-off-by: Xiongfeng Wang <wangxiongfeng2@...wei.com>
>> ---
>>  drivers/char/ipmi/ipmi_watchdog.c | 8 ++++++--
>>  1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
>> index 55986e1..3e05a1d 100644
>> --- 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.

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

> 
> An unrelated question: Are you using any of the special functions of the
> IPMI watchdog, like the pretimeout?

I am not using any special functions of the IPMI watchdog. It's just that I cat
the parameters below 'ipmi_watchdog' and find we can add a newline here.

Thanks,
Xiongfeng

> 
> -corey
> 
>> +
>> +	return len;
>>  }
>>  
>>  
>> -- 
>> 1.7.12.4
>>
> 
> .
>