linux-kernel - Re: [PATCH v5 06/36] i2c: tegra: Runtime PM always available on Tegra

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Message-ID: <CAHp75Vf3BirttCnW5KarsL0_MqofpWnEN5K5z+TY2YZV-R9fhQ@mail.gmail.com>
Date:   Mon, 7 Sep 2020 18:34:56 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        linux-tegra@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 06/36] i2c: tegra: Runtime PM always available on Tegra

On Mon, Sep 7, 2020 at 6:25 PM Dmitry Osipenko <digetx@...il.com> wrote:
> 07.09.2020 18:05, Andy Shevchenko пишет:
> > On Mon, Sep 7, 2020 at 5:32 PM Dmitry Osipenko <digetx@...il.com> wrote:
> >> 07.09.2020 11:10, Andy Shevchenko пишет:

...

> >> Would be great if anyone could put effort into changing the default
> >> get_sync() behaviour and add get_sync_nofail(). Otherwise this will be a
> >> never ending problem.
> >
> > I didn't get this. For time being the API (yes, with its all cons) has
> > the clear usage:
> > a) don't check for errors -- you are fine
> > b) if you start checking errors, keep in mind refcounting.
> >
> > So, I don't see how nofail() can fix b) case.
> >
>
> It's a very unintuitive behaviour which none of other APIs have. I would
> never expect the refcount to be bumped in a case of error, this is a
> clear drawback of the API, IMO.

I agree.

> Perhaps this is not seen as a problem by
> people who have excellent memory and can easily remember about existence
> of such non-standard quirks, or by people who're touching the RPM code
> frequently.

...or by running coccinelle script.

-- 
With Best Regards,
Andy Shevchenko