linux-kernel - Re: [PATCH 1/2] hp-wmi: Fix error value for hp_wmi_tablet

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Message-ID: <CAL9uMOHuC5Phg8UcCvrDwqCiCcndEF4co8R_jgPQ+LTd8WN=BQ@mail.gmail.com>
Date:   Wed, 19 Apr 2017 18:24:04 +0200
From:   Carlo Caione <carlo@...lessm.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Carlo Caione <carlo@...one.org>,
        "dvhart@...radead.org" <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: [PATCH 1/2] hp-wmi: Fix error value for hp_wmi_tablet_state

On Wed, Apr 19, 2017 at 6:21 PM, Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Sun, Apr 9, 2017 at 4:56 PM, Carlo Caione <carlo@...one.org> wrote:
>> From: Carlo Caione <carlo@...lessm.com>
>>
>> hp_wmi_tablet_state() fails to return the correct error code when
>> hp_wmi_perform_query() returns the HP WMI query specific error code
>> that is a positive value.
>
>>         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, &state,
>>                                        sizeof(state), sizeof(state));
>>         if (ret)
>> -               return ret;
>> +               return -EINVAL;
>
> Shouldn't be something like
>
> if (ret)
>  return ret < 0 ? ret : -EINVAL;
>
> Looking into the code it looks like it may return all possible values:
> 0, negative, positive.

When the HP WMI query returns a positive value something went wrong.
hp_wmi_perform_query() returns 0 on success.

-- 
Carlo Caione  |  +39.340.80.30.096  |  Endless