linux-kernel - Re: [v2,1/1] hwmon:(nct7904) Set default timeout

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Date:   Tue, 26 May 2020 22:02:52 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     yuechao.zhao@...antech.com.cn
Cc:     345351830@...com, amy.shih@...antech.com.tw,
        oakley.ding@...antech.com.tw, jia.sui@...antech.com.cn,
        Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v2,1/1] hwmon:(nct7904) Set default timeout

On Wed, May 27, 2020 at 03:49:50AM +0000, yuechao.zhao@...antech.com.cn wrote:
> From: Yuechao Zhao <yuechao.zhao@...antech.com.cn>
> 
> The timeout module parameter should not be used for setting the default
> timeout. Because, if you set the timeout = 0, the default timeout will
> be meaningless. And the timeout module parameter of 0 means "no timeout
> module paraameter specified".
> 
> Signed-off-by: Yuechao Zhao <yuechao.zhao@...antech.com.cn>

You should also replace

static int timeout = WATCHDOG_TIMEOUT;

with

static int timeout;

to ensure that the module parameter is only evaluated if it is actually
set. Otherwise your patch has no real impact except if someone explicitly
specifies a timeout parameter of 0 which doesn't really make much sense.

Thanks,
Guenter

> ---
> - modify subject to 'hwmon:(nct7904) Set default timeout'
> ---
>  drivers/hwmon/nct7904.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/nct7904.c b/drivers/hwmon/nct7904.c
> index 18c95be..27eb276 100644
> --- a/drivers/hwmon/nct7904.c
> +++ b/drivers/hwmon/nct7904.c
> @@ -1147,7 +1147,7 @@ static int nct7904_probe(struct i2c_client *client,
>  	data->wdt.ops = &nct7904_wdt_ops;
>  	data->wdt.info = &nct7904_wdt_info;
>  
> -	data->wdt.timeout = timeout * 60; /* in seconds */
> +	data->wdt.timeout = WATCHDOG_TIMEOUT * 60; /* Set default timeout */
>  	data->wdt.min_timeout = MIN_TIMEOUT;
>  	data->wdt.max_timeout = MAX_TIMEOUT;
>  	data->wdt.parent = &client->dev;
> -- 
> 1.8.3.1
>