Re: [PATCH 1/8] drm/sched: Add locking to drm_sched_entity_modify_sched

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Am 09.09.24 um 19:19 schrieb Tvrtko Ursulin:
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxx>

Without the locking amdgpu currently can race between
amdgpu_ctx_set_entity_priority() (via drm_sched_entity_modify_sched()) and
drm_sched_job_arm(), leading to the latter accesing potentially
inconsitent entity->sched_list and entity->num_sched_list pair.

v2:
  * Improve commit message. (Philipp)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxx>
Fixes: b37aced31eb0 ("drm/scheduler: implement a function to modify sched list")
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Luben Tuikov <ltuikov89@xxxxxxxxx>
Cc: Matthew Brost <matthew.brost@xxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Philipp Stanner <pstanner@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v5.7+

Reviewed-by: Christian König <christian.koenig@xxxxxxx>

---
  drivers/gpu/drm/scheduler/sched_entity.c | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
index 58c8161289fe..ae8be30472cd 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -133,8 +133,10 @@ void drm_sched_entity_modify_sched(struct drm_sched_entity *entity,
  {
  	WARN_ON(!num_sched_list || !sched_list);
+ spin_lock(&entity->rq_lock);
  	entity->sched_list = sched_list;
  	entity->num_sched_list = num_sched_list;
+	spin_unlock(&entity->rq_lock);
  }
  EXPORT_SYMBOL(drm_sched_entity_modify_sched);





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