linux-kernel - Re: [PATCH 1/2] ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure

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Date:   Wed, 21 Apr 2021 18:20:56 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Hanjun Guo <guohanjun@...wei.com>,
        dann frazier <dann.frazier@...onical.com>,
        Fu Wei <wefu@...hat.com>, Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        stable@...r.kernel.org, Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH 1/2] ACPI: GTDT: Don't corrupt interrupt mappings on
 watchdow probe failure

(with stable email fixed, but may need separate posting anyways)

On Wed, Apr 21, 2021 at 05:43:16PM +0100, Marc Zyngier wrote:
> When failing the driver probe because of invalid firmware properties,
> the GTDT driver unmaps the interrupt that it mapped earlier.
> 
> However, it never checks whether the mapping of the interrupt actially
> succeeded. Even more, should the firmware report an illegal interrupt
> number that overlaps with the GIC SGI range, this can result in an
> IPI being unmapped, and subsequent fireworks (as reported by Dann
> Frazier).
> 
> Rework the driver to have a slightly saner behaviour and actually
> check whether the interrupt has been mapped before unmapping things.
> 
> Reported-by: dann frazier <dann.frazier@...onical.com>
> Fixes: ca9ae5ec4ef0 ("acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver")
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> Link: https://lore.kernel.org/r/YH87dtTfwYgavusz@xps13.dannf
> Cc: stable@...rlkernel.org
                ^^^

I thought I messed up while replying with my fat fingers, but here is the
culprit. I got mail delivery failure to my reply, thought I will let you
know as it may be difficult to notice this when using git send-email.

-- 
Regards,
Sudeep