linux-kernel - Re: [PATCH] watchdog: Add {min,max}

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Message-ID: <f89159ab-a12e-6a71-c415-da1800d67c21@roeck-us.net>
Date:   Mon, 10 May 2021 07:56:04 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Juerg Haefliger <juerg.haefliger@...onical.com>
Cc:     wim@...ux-watchdog.org, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: Add {min,max}_timeout sysfs nodes

On 5/10/21 7:14 AM, Juerg Haefliger wrote:
> On Mon, 10 May 2021 06:45:15 -0700
> Guenter Roeck <linux@...ck-us.net> wrote:
> 
>> On 5/10/21 6:16 AM, Juerg Haefliger wrote:
>>> The valid range for the 'timeout' value is useful information so expose
>>> the min and max timeout values via sysfs.
>>>
>>> Signed-off-by: Juerg Haefliger <juergh@...onical.com>
>>> ---
>>>    drivers/watchdog/watchdog_dev.c | 20 ++++++++++++++++++++
>>>    1 file changed, 20 insertions(+)
>>>
>>> diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
>>> index 2946f3a63110..b84d53a79618 100644
>>> --- a/drivers/watchdog/watchdog_dev.c
>>> +++ b/drivers/watchdog/watchdog_dev.c
>>> @@ -525,6 +525,24 @@ static ssize_t timeout_show(struct device *dev, struct device_attribute *attr,
>>>    }
>>>    static DEVICE_ATTR_RO(timeout);
>>>    
>>> +static ssize_t min_timeout_show(struct device *dev,
>>> +				struct device_attribute *attr, char *buf)
>>> +{
>>> +	struct watchdog_device *wdd = dev_get_drvdata(dev);
>>> +
>>> +	return sprintf(buf, "%u\n", wdd->min_timeout);
>>> +}
>>> +static DEVICE_ATTR_RO(min_timeout);
>>> +
>>> +static ssize_t max_timeout_show(struct device *dev,
>>> +				struct device_attribute *attr, char *buf)
>>> +{
>>> +	struct watchdog_device *wdd = dev_get_drvdata(dev);
>>> +
>>> +	return sprintf(buf, "%u\n", wdd->max_timeout);
>>
>> Makes sense, but please use sysfs_emit().
> 
> OK. And maybe I should send a patch to convert the other occurrences of
> sprintf as well?
> 

Sure, if you want to.

Guenter