linux-kernel - Re: [PATCH v5 10/11] platform/x86: int3472: Pass tps68470_regulator_platform

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1f4377bb-2902-05e9-95c7-ad924477b543@redhat.com>
Date:   Tue, 2 Nov 2021 15:59:41 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Mark Gross <markgross@...nel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Kate Hsuan <hpa@...hat.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v5 10/11] platform/x86: int3472: Pass
 tps68470_regulator_platform_data to the tps68470-regulator MFD-cell

Hi,

On 11/2/21 15:34, Andy Shevchenko wrote:
> On Tue, Nov 2, 2021 at 11:50 AM Hans de Goede <hdegoede@...hat.com> wrote:
>>
>> Pass tps68470_regulator_platform_data to the tps68470-regulator
>> MFD-cell, specifying the voltages of the various regulators and
>> tying the regulators to the sensor supplies so that sensors which use
>> the TPS68470 can find their regulators.
>>
>> Since the voltages and supply connections are board-specific, this
>> introduces a DMI matches int3472_tps68470_board_data struct which
>> contains the necessary per-board info.
>>
>> This per-board info also includes GPIO lookup information for the
>> sensor IO lines which may be connected to the tps68470 GPIOs.
> 
> ...
> 
>> +               board_data = int3472_tps68470_get_board_data(dev_name(&client->dev));
>> +               if (!board_data) {
>> +                       dev_err(&client->dev, "No board-data found for this laptop/tablet model\n");
>> +                       return -ENODEV;
> 
> It's fine to use dev_err_probe() for known error codes.
> 
>> +               }
> 
> ...
> 
>> +               cells[1].platform_data = (void *)board_data->tps68470_regulator_pdata;
> 
> Do we need casting?

Yes, the cast casts away a "const", the const is correct
since the data only ever gets read by the regulator driver,
but platform_data pointers are normally not const, so it
is either the cast, or loose the const on the definition
of the struct to which board_data->tps68470_regulator_pdata
points...

So not good choice here really, only chosing between bad
options and I picked the lets do the cast "least worse"
option (at least to me). I'm open to changing this.



> ...
> 
>> +#include <linux/dmi.h>
>> +#include <linux/gpio/machine.h>
>> +#include <linux/platform_data/tps68470.h>
>> +#include <linux/regulator/machine.h>
> 
> string.h  for strcmp() ?
> kernel.h for ARRAY_SIZE() ?

Ack.

Regards,

Hans