linux-kernel - Re: [PATCH] irqchip/versatile-fpga: Apply clear-mask earlier

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Date:   Sun, 22 Mar 2020 11:51:09 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Sungbo Eo <mans0n@...ani.run>, linux-oxnas@...ups.io,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>,
        Daniel Golle <daniel@...rotopia.org>
Subject: Re: [PATCH] irqchip/versatile-fpga: Apply clear-mask earlier

On 2020-03-22 11:45, Linus Walleij wrote:
> On Sat, Mar 21, 2020 at 2:40 PM Sungbo Eo <mans0n@...ani.run> wrote:
> 
>> Clear its own IRQs before the parent IRQ get enabled, so that the
>> remaining IRQs do not accidentally interrupt the parent IRQ 
>> controller.
>> 
>> This patch also fixes a reboot bug on OX820 SoC, where the remaining
>> rps-timer IRQ raises a GIC interrupt that is left pending. After that,
>> the rps-timer IRQ is cleared during driver initialization, and there's
>> no IRQ left in rps-irq when local_irq_enable() is called, which evokes
>> an error message "unexpected IRQ trap".
>> 
>> Fixes: bdd272cbb97a ("irqchip: versatile FPGA: support cascaded 
>> interrupts from DT")
>> Signed-off-by: Sungbo Eo <mans0n@...ani.run>
>> Cc: Neil Armstrong <narmstrong@...libre.com>
>> Cc: Daniel Golle <daniel@...rotopia.org>
> 
> Good catch!
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> 
> Marc: Cc stable?

Sure, I'll add that.

Thanks,

         M.
-- 
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