linux-kernel - Re: Re: Re: [PATCH] spi: tegra20-slink: Fix runtime PM imbalance on error

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Message-ID: <CAHp75VcfcE63KHbyokoBuBKDdTHiB8QiauL8XU=rRo0-=NL-Kg@mail.gmail.com>
Date:   Sat, 23 May 2020 14:52:33 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     Kangjie Lu <kjlu@....edu>, Laxman Dewangan <ldewangan@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-spi <linux-spi@...r.kernel.org>,
        linux-tegra@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Re: Re: [PATCH] spi: tegra20-slink: Fix runtime PM imbalance on error

On Sat, May 23, 2020 at 2:32 PM <dinghao.liu@....edu.cn> wrote:
>
> > On Fri, May 22, 2020 at 6:20 PM Andy Shevchenko
> > <andy.shevchenko@...il.com> wrote:
> > > On Fri, May 22, 2020 at 10:46 AM <dinghao.liu@....edu.cn> wrote:

...

> I also checked many other implementation of probe in drivers.
> It seems that using pm_runtime_put() is ok.

In *error path* or normal path?

> If I misunderstood
> your opinion, please point it out, thanks.

Bottom line is (for the *error path* case):
pm_runtime_put_noidle() has no side effects
pm_runtime_put() (potentially) might have side effects.

You should choose one which is clearer about what it does.

-- 
With Best Regards,
Andy Shevchenko