linux-kernel - Re: [RFC PATCH] irqchip/sifive-plic: Fix getting wrong chip

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Date:   Thu, 05 Nov 2020 18:02:58 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     tglx@...utronix.de
CC:     Marc Zyngier <maz@...nel.org>, jason@...edaemon.net,
        geert+renesas@...der.be, greentime.hu@...ive.com,
        linux-kernel@...r.kernel.org, Atish Patra <Atish.Patra@....com>,
        linux-riscv@...ts.infradead.org,
        Paul Walmsley <paul.walmsley@...ive.com>, anup@...infault.org,
        uli+renesas@...nd.eu, linux-renesas-soc@...r.kernel.org
Subject:     Re: [RFC PATCH] irqchip/sifive-plic: Fix getting wrong chip_data when interrupt is hierarchy

On Sun, 01 Nov 2020 08:52:06 PST (-0800), tglx@...utronix.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@...gle.com>

Thanks!