linux-kernel - Re: [PATCH v3 03/11] platform/x86: asus-wmi: Increase the input buffer size of WMI methods

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Date:   Wed, 8 May 2019 16:30:03 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Yurii Pavlovskyi <yurii.pavlovskyi@...il.com>
Cc:     Corentin Chary <corentin.chary@...il.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Daniel Drake <drake@...lessm.com>,
        acpi4asus-user <acpi4asus-user@...ts.sourceforge.net>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 03/11] platform/x86: asus-wmi: Increase the input
 buffer size of WMI methods

On Fri, Apr 19, 2019 at 1:07 PM Yurii Pavlovskyi
<yurii.pavlovskyi@...il.com> wrote:
>
> The asus-nb-wmi driver is matched by WMI alias but fails to load on TUF
> Gaming series laptops producing multiple ACPI errors in the kernel log.
>
> The input buffer for WMI method invocation size is 2 dwords, whereas
> 3 are expected by this model.
>
> FX505GM:
> ..
> Method (WMNB, 3, Serialized)
> {
>     P8XH (Zero, 0x11)
>     CreateDWordField (Arg2, Zero, IIA0)
>     CreateDWordField (Arg2, 0x04, IIA1)
>     CreateDWordField (Arg2, 0x08, IIA2)
>     Local0 = (Arg1 & 0xFFFFFFFF)
>     ...
>
> Compare with older K54C:
> ...
> Method (WMNB, 3, NotSerialized)
> {
>     CreateDWordField (Arg2, 0x00, IIA0)
>     CreateDWordField (Arg2, 0x04, IIA1)
>     Local0 = (Arg1 & 0xFFFFFFFF)
>     ...
>
> Increase buffer size to 3 dwords. No negative consequences of this change
> are expected, as the input buffer size is not verified. The original
> function is replaced by a wrapper for a new method passing value 0 for the
> last parameter. The new function will be used to control RGB keyboard
> backlight.


> -int asus_wmi_evaluate_method(u32 method_id, u32 arg0, u32 arg1, u32 *retval)
> +static int asus_wmi_evaluate_method_3dw(u32 method_id, u32 arg0, u32 arg1,
> +               u32 arg2, u32 *retval)

I would name as "..._method3" and move arg2 to previous line

>  {
>         struct bios_args args = {
>                 .arg0 = arg0,
>                 .arg1 = arg1,
> +               .arg2 = arg2

Keep comma, it will help in the future, like above helped you here.

--
With Best Regards,
Andy Shevchenko