linux-kernel - Re: [PATCH 4/7] mfd: hi6421-spmi-pmic: Use generic_handle_irq

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Message-ID: <d351e221-ddd4-eb34-5bbe-08314d26a2e0@gmail.com>
Date:   Fri, 28 Jan 2022 19:44:36 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        greybus-dev@...ts.linaro.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Alex Elder <elder@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hovold <johan@...nel.org>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        UNGLinuxDriver@...rochip.com, Wolfram Sang <wsa@...nel.org>,
        Woojung Huh <woojung.huh@...rochip.com>
Subject: Re: [PATCH 4/7] mfd: hi6421-spmi-pmic: Use generic_handle_irq_safe().

On 1/28/22 4:33 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@...utronix.de>
>> [...]
>>
>> MBR, Sergey
> 
> What does that mean?

   Ah, you were asking about MBR! My best regards then. :-)

MBR, Sergey