linux-kernel - Re: [PATCH v3] i8k: Autodetect maximal fan speed and fan RPM multiplier

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Date:	Sun, 21 Dec 2014 13:09:40 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Arnd Bergmann <arnd@...db.de>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, Valdis.Kletnieks@...edu,
	Steven Honeyman <stevenhoneyman@...il.com>,
	Jean Delvare <jdelvare@...e.de>,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	Jochen Eisinger <jochen@...guin-breeder.org>
Subject: Re: [PATCH v3] i8k: Autodetect maximal fan speed and fan RPM multiplier

On Sunday 21 December 2014 12:57:08 Guenter Roeck wrote:
> > -#define I8K_FAN_MULT		30
> > +#define I8K_FAN_MAX_RPM		30000
> > 
> >   #define I8K_MAX_TEMP		127
> >   
> >   #define I8K_FN_NONE		0x00
> > 
> > @@ -64,7 +66,7 @@ static DEFINE_MUTEX(i8k_mutex);
> > 
> >   static char bios_version[4];
> >   static struct device *i8k_hwmon_dev;
> >   static u32 i8k_hwmon_flags;
> > 
> > -static int i8k_fan_mult;
> > +static int i8k_fan_mult = 30;
> 
> Why did you drop I8K_FAN_MULT ?
> 

Because I think it is not needed anymore... It is used only in 
one place (there ^). But if you want I can revert it back.

> >   static int __init i8k_probe(void)
> >   {
> > 
> > +	const struct i8k_config_data *conf;
> 
> Why did you move this variable declaration ?
> 

Comes from previous version of patches where I moved all 
variables to start of function. I will revert this change.

> > 
> > -		const struct i8k_config_data *conf = id->driver_data;
> > +		conf = id->driver_data;
> > +		if (fan_mult <= 0 && conf->fan_mult > 0)
> 
> I still don't see the value in accepting fan_mult < 0
> (compeared to == 0).
> 

Ok. What kernel driver should do if user load it with negative 
parameter? We should not propagate negative value to functions.

-- 
Pali Rohár
pali.rohar@...il.com

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