linux-kernel - Re: [PATCH] hwmon: (nct6775) mask out bank number in nct6775_wmi_read

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Date:   Thu, 11 Nov 2021 11:14:18 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Zev Weiss <zev@...ilderbeest.net>
Cc:     linux-hwmon@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        Denis Pauk <pauk.denis@...il.com>,
        Bernhard Seibold <mail@...nhard-seibold.de>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] hwmon: (nct6775) mask out bank number in nct6775_wmi_read_value()

On Thu, Nov 11, 2021 at 4:53 AM Zev Weiss <zev@...ilderbeest.net> wrote:
>
> The first call to nct6775_asuswmi_read() in nct6775_wmi_read_value()
> had been passing the full bank+register number instead of just the
> lower 8 bits.

>  It didn't end up actually causing problems because the
> second argument of that function is a u8 anyway,

It contradicts the existence of the Fixes tag below. What do you fix then?

> but it seems
> preferable to be explicit about it at the call site (and consistent
> with the rest of the code).

Yeah, in the current state it makes sense.
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

Later one may refactor this to drop that tons of ' & 0xff':s.

> Signed-off-by: Zev Weiss <zev@...ilderbeest.net>
> Fixes: 3fbbfc27f955 ("hwmon: (nct6775) Support access via Asus WMI")
> ---
>  drivers/hwmon/nct6775.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
> index 93dca471972e..57ce8633a725 100644
> --- a/drivers/hwmon/nct6775.c
> +++ b/drivers/hwmon/nct6775.c
> @@ -1527,7 +1527,7 @@ static u16 nct6775_wmi_read_value(struct nct6775_data *data, u16 reg)
>
>         nct6775_wmi_set_bank(data, reg);
>
> -       err = nct6775_asuswmi_read(data->bank, reg, &tmp);
> +       err = nct6775_asuswmi_read(data->bank, reg & 0xff, &tmp);
>         if (err)
>                 return 0;

> 2.33.1
>


-- 
With Best Regards,
Andy Shevchenko