linux-kernel - Re: [PATCH 20/61] input: keyboard: simplify getting .drvdata

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Message-ID: <20180426200401.lvqiy4gnchkwr4qw@ninjato>
Date:   Thu, 26 Apr 2018 22:04:01 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        kernel-janitors@...r.kernel.org, Vladimir Zapolskiy <vz@...ia.com>,
        Sylvain Lemieux <slemieux.tyco@...il.com>,
        Rakesh Iyer <riyer@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-input@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH 20/61] input: keyboard: simplify getting .drvdata

Hi Dmitry,

> > We should get drvdata from struct device directly. Going via
> > platform_device is an unneeded step back and forth.
> 
> I consider the fact that platform device's driver data is accessible via
> device driver data being implementation detail that may or may not change

Isn't it actually the other way around? platform_get_drvdata() is a
convenience function to access driver_data which is embedded in struct
device?

> in the future, so I'd prefer keep using the proper accessors for the
> objects we are dealing with.

Exactly. I'd just argue, the object we are dealing with, declared in the
PM functions, is a struct device.

Thanks for the comment,

   Wolfram


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