linux-kernel - Re: [PATCH v1 1/6] mfd: Add driver for Embedded Controller found on Acer Iconia Tab A500

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: <20200824073331.GG3248864@dell>
Date:   Mon, 24 Aug 2020 08:33:31 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Lubomir Rintel <lkundrak@...sk>, Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Sebastian Reichel <sre@...nel.org>, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/6] mfd: Add driver for Embedded Controller found on
 Acer Iconia Tab A500

On Sun, 23 Aug 2020, Dmitry Osipenko wrote:

> 23.08.2020 21:16, Lubomir Rintel пишет:
> > Hello,
> ...
> >> +config MFD_ACER_A500_EC
> >> +	tristate "Embedded Controller driver for Acer Iconia Tab A500"
> >> +	depends on (I2C_TEGRA && ARCH_TEGRA_2x_SOC) || COMPILE_TEST
> > 
> > This seems to also depend on I2C and OF. Perhaps I2C_TEGRA and
> > ARCH_TEGRA_2x_SOC imply that, but it could lead to build failures with
> > COMPILE_TEST=y. 
> 
> Hello, Lubomir! You're right about the I2C because it could be compiled
> as a loadable module, good catch! The OF seems should fine as-is.
> 
> ...
> >> +static struct a500_ec *a500_ec_scratch;
> > 
> > If this is only used for power_off, please rename it. I've been told to
> > do so in my driver: https://lore.kernel.org/lkml/20200519104933.GX271301@dell/
> 
> I don't mind to rename the variable, but not sure whether it will be a
> worthwhile change since _scratch is also a common naming scheme among
> MFD drivers. Please see max77620_scratch for example, which I added
> about a year ago.

If something is used once, it does not make it 'common'.

Not sure how this slipped my notice before, but I don't like it.

Ensure any global struct used for power_off only includes items
required for this purpose.  It's unfortunate this API requires a
global variable at all.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog