From: Marc Zyngier <maz@kernel.org>
To: Thomas Gleixner <tglx@kernel.org>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Robin Murphy <robin.murphy@arm.com>,
stable@vger.kernel.org
Subject: Re: [PATCH] irqchip/gic-v3-its: Limit number of per-device MSIs to the range the ITS supports
Date: Sat, 07 Feb 2026 22:25:29 +0000 [thread overview]
Message-ID: <86zf5kb38m.wl-maz@kernel.org> (raw)
In-Reply-To: <87h5rsb64v.ffs@tglx>
On Sat, 07 Feb 2026 21:22:56 +0000,
Thomas Gleixner <tglx@kernel.org> wrote:
>
> 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@kernel.org>
> > Cc: stable@vger.kernel.org
>
> Can you please provide a Fixes tag?
That'd be
Fixes: 84a6a2e7fc18d ("irqchip: GICv3: ITS: device allocation and configuration")
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
next prev parent reply other threads:[~2026-02-07 22:25 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-06 15:48 [PATCH] irqchip/gic-v3-its: Limit number of per-device MSIs to the range the ITS supports Marc Zyngier
2026-02-06 16:01 ` Robin Murphy
2026-02-07 21:22 ` Thomas Gleixner
2026-02-07 22:25 ` Marc Zyngier [this message]
2026-02-08 18:48 ` Zenghui Yu
2026-02-17 10:02 ` [tip: irq/urgent] " tip-bot2 for Marc Zyngier
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