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

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Message-ID: <25c97722-e05d-467c-908e-baa31e636a44@kernel.org>
Date: Fri, 24 Oct 2025 18:17:40 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: 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 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>