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

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Message-ID: <CAHp75VeuiwPBt2AU95X1KHWT3nm5LedG0n5aR9Vd+kPfQaRT-g@mail.gmail.com>
Date:   Wed, 19 Apr 2017 19:26:28 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Carlo Caione <carlo@...lessm.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 7:24 PM, Carlo Caione <carlo@...lessm.com> wrote:
> 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.

Yes, that's what I didn't object anyhow. My point is not to shadow
negative errors if any.

-- 
With Best Regards,
Andy Shevchenko