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

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Message-ID: <44b42c37-67a4-1d20-e2ff-563d4f9bfae2@gmail.com>
Date:   Fri, 28 Jan 2022 13:23:08 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     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
Cc:     "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>,
        Lee Jones <lee.jones@...aro.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 1/27/22 2:33 PM, Sebastian Andrzej Siewior 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