[RFC PATCH] irqchip/sifive-plic: Fix getting wrong chip_data when interrupt is hierarchy

[Palmer Dabbelt]

On Sun, 01 Nov 2020 08:52:06 PST (-0800), tglx at linutronix.de wrote:
> On Sun, Nov 01 2020 at 12:10, Marc Zyngier wrote:
>
>> On Thu, 29 Oct 2020 10:37:38 +0800, Greentime Hu wrote:
>>> This oops is caused by a wrong chip_data and it is because plic_irq_unmask
>>> uses irq_get_chip_data(irq_data->irq) to get the chip_data. However it may
>>> get another irq_data with the same irq_data->irq if it is hierarchy.
>>>
>>> In this case, it will get irq_data of sifive_gpio_irqchip instead of
>>> plic_chip so that it will get a wrong chip_data and then the wrong lmask
>>> of it to cause this oops.
>>>
>>> [...]
>>
>> Applied to irq/irqchip-next, thanks!
>
> That should go into urgent, the offending commit is in Linus tree already

I agree.  I'm assuming that's for Marc, but LMK if you guys want me to take it.

Acked-by: Palmer Dabbelt <palmerdabbelt at google.com>

Thanks!