linux-kernel - Re: [PATCH] gpio: pca953x: add a comment explaining the need for a lockdep subclass

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Message-ID: <CAMpxmJWmzju-gJ54irsqGb86i6THx4BXzqMAa=okqGAi=5bbrA@mail.gmail.com>
Date:   Thu, 29 Sep 2016 09:56:58 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Vignesh R <vigneshr@...com>, Yong Li <yong.b.li@...el.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Peter Rosin <peda@...ntia.se>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: pca953x: add a comment explaining the need for a
 lockdep subclass

2016-09-29 8:06 GMT+02:00 Wolfram Sang <wsa@...-dreams.de>:
> On Mon, Sep 26, 2016 at 12:00:30PM +0200, Wolfram Sang wrote:
>> On Mon, Sep 26, 2016 at 11:54:15AM +0200, Bartosz Golaszewski wrote:
>> > This is a follow-up to commit 559b46990e76 ("gpio: pca953x: fix an
>> > incorrect lockdep warning"). The reason for calling
>> > lockdep_set_subclass() in pca953x_probe() is not explained in
>> > the code.
>> >
>> > Add a comment describing the problem, partial solution and required
>> > future extensions.
>> >
>> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
>>
>> Acked-by: Wolfram Sang <wsa@...-dreams.de>
>>
>> Linus, because of dependencies, I should probably pick it up?
>
> Linus, ping!
>

Hi Wolfram,

this patch will not apply to the gpio tree. If Linus is too busy to
comment, maybe you could pick it up anyway - it doesn't change
anything in terms of functionality and it's better to have the code
commented when it's not obvious what it does.

Thanks,
Bartosz