Patch "drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job" has been added to the 6.10-stable tree

[gregkh at linuxfoundation.org]

This is a note to let you know that I've just added the patch titled

    drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job

to the 6.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-sched-always-wake-up-correct-scheduler-in-drm_sched_entity_push_job.patch
and it can be found in the queue-6.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.


>From cbc8764e29c2318229261a679b2aafd0f9072885 Mon Sep 17 00:00:00 2001
From: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>
Date: Tue, 24 Sep 2024 11:19:08 +0100
Subject: drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit

From: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>

commit cbc8764e29c2318229261a679b2aafd0f9072885 upstream.

Since drm_sched_entity_modify_sched() can modify the entities run queue,
lets make sure to only dereference the pointer once so both adding and
waking up are guaranteed to be consistent.

Alternative of moving the spin_unlock to after the wake up would for now
be more problematic since the same lock is taken inside
drm_sched_rq_update_fifo().

v2:
 * Improve commit message. (Philipp)
 * Cache the scheduler pointer directly. (Christian)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>
Fixes: b37aced31eb0 ("drm/scheduler: implement a function to modify sched list")
Cc: Christian König <christian.koenig at amd.com>
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: Luben Tuikov <ltuikov89 at gmail.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Cc: David Airlie <airlied at gmail.com>
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: Philipp Stanner <pstanner at redhat.com>
Cc: dri-devel at lists.freedesktop.org
Cc: <stable at vger.kernel.org> # v5.7+
Reviewed-by: Christian König <christian.koenig at amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240924101914.2713-3-tursulin@igalia.com
Signed-off-by: Christian König <christian.koenig at amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/gpu/drm/scheduler/sched_entity.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -599,6 +599,9 @@ void drm_sched_entity_push_job(struct dr
 
 	/* first job wakes up scheduler */
 	if (first) {
+		struct drm_gpu_scheduler *sched;
+		struct drm_sched_rq *rq;
+
 		/* Add the entity to the run queue */
 		spin_lock(&entity->rq_lock);
 		if (entity->stopped) {
@@ -608,13 +611,16 @@ void drm_sched_entity_push_job(struct dr
 			return;
 		}
 
-		drm_sched_rq_add_entity(entity->rq, entity);
+		rq = entity->rq;
+		sched = rq->sched;
+
+		drm_sched_rq_add_entity(rq, entity);
 		spin_unlock(&entity->rq_lock);
 
 		if (drm_sched_policy == DRM_SCHED_POLICY_FIFO)
 			drm_sched_rq_update_fifo(entity, submit_ts);
 
-		drm_sched_wakeup(entity->rq->sched);
+		drm_sched_wakeup(sched);
 	}
 }
 EXPORT_SYMBOL(drm_sched_entity_push_job);


Patches currently in stable-queue which might be from tvrtko.ursulin at igalia.com are

queue-6.10/drm-sched-always-increment-correct-scheduler-score.patch
queue-6.10/drm-v3d-prevent-out-of-bounds-access-in-performance-query-extensions.patch
queue-6.10/drm-sched-always-wake-up-correct-scheduler-in-drm_sched_entity_push_job.patch
queue-6.10/drm-sched-add-locking-to-drm_sched_entity_modify_sched.patch