linux-kernel - Re: [PATCH v7 00/48] atmel_mxt

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Date:   Wed, 25 Mar 2020 21:13:09 +0900
From:   "Wang, Jiada" <jiada_wang@...tor.com>
To:     Dmitry Osipenko <digetx@...il.com>, <jikos@...nel.org>,
        <benjamin.tissoires@...hat.com>, <rydberg@...math.org>,
        <dmitry.torokhov@...il.com>, <nick@...anahar.org>,
        <bsz@...ihalf.com>
CC:     <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <erosca@...adit-jv.com>, <Andrew_Gabbasov@...tor.com>
Subject: Re: [PATCH v7 00/48] atmel_mxt_ts misc

Hi Dmitry

On 2020/03/24 23:54, Dmitry Osipenko wrote:
> 23.03.2020 05:25, Wang, Jiada пишет:
>> Hello Dmitry
>>
>> On 2020/03/21 0:53, Dmitry Osipenko wrote:
>>> Hello Jiada,
>>>
>>> 20.03.2020 06:37, Wang, Jiada пишет:
>>>> Hello Dmitry
>>>>
>>>> I have submitted v8 patch-set to address your comments towards v7
>>>> patch-set,
>>>> most of checkpatch warnings and errors have been addressed,
>>>>
>>>> But I didn't update for following two types of warnings
>>>> since I want to keep consistency with legacy code
>>>>
>>>> WARNING: DEVICE_ATTR unusual permissions '0600' used
>>>> #290: FILE: drivers/input/touchscreen/atmel_mxt_ts.c:3761:
>>>> +static DEVICE_ATTR(debug_v2_enable, 0600, NULL,
>>>
>>> What will happen if you'll use 0644? Will an empty line be returned or
>>> driver will crash?
>>>
>> debug_v2_enable doesn't have .show callback implemented, so after change
>> permission to 644, read of it results in an I/O error,
>>
>> for other 0600 permission interfaces (t38_data, t25 and debug_enable)
>> added in this series,
>> change to 644 can return expected information when read.
>>
>> Do you think it's better to change debug_v2_enable to 0200,
>> and others to 0644?
> 
> Since the debug_enable has mxt_debug_enable_show(), the same should be
> done for debug_v2_enable, for consistency.
> 
> The permissions should be 0644 for everything that is read/write.
> 
> The 0200 should be used for everything that is root-only and write-only.

Thanks for your comments and suggestion in another email,
I will submit v9 patch-set to address these warnings

Thanks,
Jiada
>