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

[Sudeep Holla]

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.
>

Reviewed-by: Sudeep Holla <sudeep.holla@xxxxxxx>

-- 
Regards,
Sudeep