linux-kernel - [RFC PATCH 3/6] drm/sched: Warn if pending list is not empty

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Message-ID: <20250603093130.100159-5-phasta@kernel.org>
Date: Tue,  3 Jun 2025 11:31:28 +0200
From: Philipp Stanner <phasta@...nel.org>
To: Lyude Paul <lyude@...hat.com>,
	Danilo Krummrich <dakr@...nel.org>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Matthew Brost <matthew.brost@...el.com>,
	Philipp Stanner <phasta@...nel.org>,
	Christian König <ckoenig.leichtzumerken@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Tvrtko Ursulin <tvrtko.ursulin@...lia.com>,
	Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
Cc: dri-devel@...ts.freedesktop.org,
	nouveau@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org
Subject: [RFC PATCH 3/6] drm/sched: Warn if pending list is not empty

drm_sched_fini() can leak jobs under certain circumstances.

Warn if that happens.

Signed-off-by: Philipp Stanner <phasta@...nel.org>
---
 drivers/gpu/drm/scheduler/sched_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 3f14f1e151fa..df12d5aaa1af 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -1414,6 +1414,9 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
 	sched->ready = false;
 	kfree(sched->sched_rq);
 	sched->sched_rq = NULL;
+
+	if (!list_empty(&sched->pending_list))
+		dev_err(sched->dev, "Tearing down scheduler while jobs are pending!\n");
 }
 EXPORT_SYMBOL(drm_sched_fini);
 
-- 
2.49.0