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Subject: Re: [PATCH 4/7] mfd: hi6421-spmi-pmic: Use generic_handle_irq_safe().
To:     Lee Jones <lee.jones@linaro.org>
Cc:     Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        greybus-dev@lists.linaro.org, linux-i2c@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-staging@lists.linux.dev,
        linux-usb@vger.kernel.org, netdev@vger.kernel.org,
        "David S. Miller" <davem@davemloft.net>,
        Alex Elder <elder@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Hans de Goede <hdegoede@redhat.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Johan Hovold <johan@kernel.org>,
        Rui Miguel Silva <rmfrfs@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        UNGLinuxDriver@microchip.com, Wolfram Sang <wsa@kernel.org>,
        Woojung Huh <woojung.huh@microchip.com>
References: <20220127113303.3012207-1-bigeasy@linutronix.de>
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 <d351e221-ddd4-eb34-5bbe-08314d26a2e0@gmail.com>
 <YfQeuWk0S4bxPVCg@google.com>
From:   Sergei Shtylyov <sergei.shtylyov@gmail.com>
Message-ID: <42d216c4-abf2-7937-1a99-0aecc4ef2222@gmail.com>
Date:   Fri, 28 Jan 2022 22:37:28 +0300
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On 1/28/22 7:50 PM, Lee Jones wrote:

[...]
>>>>> generic_handle_irq() is invoked from a regular interrupt service
>>>>> routing. This handler will become a forced-threaded handler on
>>>>
>>>>    s/routing/routine/?
>>>>
>>>>> PREEMPT_RT and will be invoked with enabled interrupts. The
>>>>> generic_handle_irq() must be invoked with disabled interrupts in order
>>>>> to avoid deadlocks.
>>>>>
>>>>> Instead of manually disabling interrupts before invoking use
>>>>> generic_handle_irq() which can be invoked with enabled and disabled
>>>>> interrupts.
>>>>>
>>>>> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
>>>> [...]
>>>>
>>>> MBR, Sergey
>>>
>>> What does that mean?
>>
>>    Ah, you were asking about MBR! My best regards then. :-)
> 
> Yes this.  It's okay, Dan was kind enough to enlighten me.
> 
> Every day is a school day on the list! :)

   It's not exactly a well known phrase, I like it mainly because it also stands
for the Master Boot Record. :-)

MBR, Sergey