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

Marc Zyngier
2020-03-22T11:51:13Z

On 2020-03-22 11:45, Linus Walleij wrote:
> On Sat, Mar 21, 2020 at 2:40 PM Sungbo Eo <mans0n@gorani.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@gorani.run>
>> Cc: Neil Armstrong <narmstrong@baylibre.com>
>> Cc: Daniel Golle <daniel@makrotopia.org>
>
> Good catch!
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
>
> Marc: Cc stable?

Sure, I'll add that.

Thanks,

M.
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