linux-kernel - Re: [PATCH] drm/nouveau: Fix race in nouveau_sched

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Message-ID: <5b22257b90d5df1c4a6b02f9472f11588208c4b5.camel@mailbox.org>
Date: Mon, 27 Oct 2025 14:00:15 +0100
From: Philipp Stanner <phasta@...lbox.org>
To: Danilo Krummrich <dakr@...nel.org>, Philipp Stanner <phasta@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] drm/nouveau: Fix race in nouveau_sched_fini()

On Fri, 2025-10-24 at 18:17 +0200, Danilo Krummrich wrote:
> On 10/24/25 6:12 PM, Philipp Stanner wrote:
> > nouveau_sched_fini() uses a memory barrier before wait_event().
> > wait_event(), however, is a macro which expands to a loop which might
> > check the passed condition several times. The barrier would only take
> > effect for the first check.
> > 
> > Replace the barrier with a function which takes the spinlock.
> > 
> > Cc: stable@...r.kernel.org # v6.8+
> > Fixes: 5f03a507b29e ("drm/nouveau: implement 1:1 scheduler - entity relationship")
> > Signed-off-by: Philipp Stanner <phasta@...nel.org>
> 
> Acked-by: Danilo Krummrich <dakr@...nel.org>

Applied to drm-misc-fixes


P.