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

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Date:   Fri, 28 Jan 2022 13:33:29 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Sergei Shtylyov <sergei.shtylyov@...il.com>
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 Fri, 28 Jan 2022, Sergei Shtylyov wrote:

> 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

What does that mean?

-- 
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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