linux-kernel - Re: [patch 1/5] pinctrl: samsung: Remove bogus irq

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Date:   Fri, 30 Jun 2017 08:02:20 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Tomasz Figa <tomasz.figa@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Brian Norris <briannorris@...omium.org>,
        Heiko Stuebner <heiko@...ech.de>,
        linux-rockchip@...ts.infradead.org,
        Julia Cartwright <julia@...com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        John Keeping <john@...anate.com>,
        Doug Anderson <dianders@...omium.org>,
        Kukjin Kim <kgene@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>
Subject: Re: [patch 1/5] pinctrl: samsung: Remove bogus irq_[un]mask from
 resource management

On Fri, Jun 30, 2017 at 4:47 AM, Tomasz Figa <tomasz.figa@...il.com> wrote:
> Hi Thomas,
>
> 2017-06-30 6:33 GMT+09:00 Thomas Gleixner <tglx@...utronix.de>:
>> The irq chip callbacks irq_request/release_resources() have absolutely no
>> business with masking and unmasking the irq.
>>
>> The core code unmasks the interrupt after complete setup and masks it
>> before invoking irq_release_resources().
>>
>> The unmask is actually harmful as it happens before the interrupt is
>> completely initialized in __setup_irq().
>>
>> Remove it.
>
> Good catch, thanks! (Note that the original patch of mine [1] did that
> in .irq_startup()/.irq_shutdown(), which was for some reason changed
> later, but I don't remember the exact story.)
>
> [1] https://patchwork.kernel.org/patch/4466431/
>
> Acked-by: Tomasz Figa <tomasz.figa@...il.com>
>
> Sylwester, Krzysztof, would you be able to do some basic test?

I suppose this was not tested so yes - I have platforms do this. I
understand that checking any non-shared GPIO interrupt should be
sufficient to test, right?

Best regards,
Krzysztof