On Wed, 21 Apr 2021 18:20:56 +0100,
Sudeep Holla [off-list ref] wrote:

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

On Wed, Apr 21, 2021 at 05:43:16PM +0100, Marc Zyngier wrote:

quoted

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 <redacted>
Fixes: ca9ae5ec4ef0 ("acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver")
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/YH87dtTfwYgavusz@xps13.dannf (local)
Cc: stable@vgerlkernel.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.

I'm definitely the one with very fat fingers. I'll fix the patch in my
tree.

Thanks for the heads up,

	M.

-- 
Without deviation from the norm, progress is not possible.

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