[PATCH] irqchip/gic-v3-its: Limit number of per-device MSIs to the range the ITS supports

[Thomas Gleixner]

On Fri, Feb 06 2026 at 15:48, Marc Zyngier wrote:

> The ITS driver blindly assumes that EventIDs are in abundant supply,
> to the point where it never checks how many the HW actually supports.
>
> It turns out that some pretty esoteric integrations make it so that
> only a few bits are available, all the way down to a. single. bit.
>
> Enforce the advertised limitation at the point of allocating the
> device structure, and hope that the endpoint driver can deal with
> such limitation.
>
> Signed-off-by: Marc Zyngier <maz at kernel.org>
> Cc: stable at vger.kernel.org

Can you please provide a Fixes tag?

Thanks,

        tglx