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SubjectRe: [PATCH v3] i8k: Autodetect maximal fan speed and fan RPM multiplier
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On Sunday 21 December 2014 17:55:51 Steven Honeyman wrote:
> On 21 December 2014 at 16:37, Pali Rohár <pali.rohar@gmail.com>
wrote:
> > On Sunday 21 December 2014 13:23:32 Guenter Roeck wrote:
> >> On 12/21/2014 04:09 AM, Pali Rohár wrote:
> >> > 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.
> >>
> >> That is not a reason to drop a define.
> >>
> >> >>> 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.
> >>
> >> You have multiple options: Ignore it (bad idea ;-), abort
> >> loading the module with -EINVAL, or make the module
> >> parameter an unsigned.
> >
> > And how to make module parameter as unsigned? It is
> > possible?
> >
> > Code
> >
> > module_param(fan_mult, unsigned int, 0);
> >
> > cause compile error:
> >
> > i8k.c:99:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
> > ‘__attribute__’ before ‘int’ i8k.c:99:1: error:
> > ‘param_ops_unsigned’ undeclared here (not in a function)
>
> module_param(fan_mult, uint, 0);
>
>
> Steven.

Thanks! I sent new patch which change module param to uint and
after then I sent new version v4 of autodetect patch.

--
Pali Rohár
pali.rohar@gmail.com
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