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

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Date:   Mon, 23 Mar 2020 11:25:20 +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

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?

Thanks,
Jiada

>> WARNING: Consider renaming function(s) 'mxt_debug_notify_show' to
>> 'debug_notify_show'
>> #292: FILE: drivers/input/touchscreen/atmel_mxt_ts.c:3763:
>> +static DEVICE_ATTR(debug_notify, 0444, mxt_debug_notify_show, NULL);
> 
> Perhaps this should be fine to ignore, although the prefix is indeed a
> bit superfluous.
> 
>> please let me know if you have different view on this
> 
> Thank you very much, I'll test v8 during the weekend.
>