This is a note to let you know that I've just added the patch titled
drm/scheduler: fix fence ref counting
to the 6.0-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-scheduler-fix-fence-ref-counting.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d68103f3d75dd240d43544ff956238f36953f134
Author: Christian König <christian.koenig@xxxxxxx>
Date: Tue Sep 27 18:43:03 2022 +0200
drm/scheduler: fix fence ref counting
[ Upstream commit b3af84383e7abdc5e63435817bb73a268e7c3637 ]
We leaked dependency fences when processes were beeing killed.
Additional to that grab a reference to the last scheduled fence.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20220929180151.139751-1-christian.koenig@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
index 6b25b2f4f5a3..7ef1a086a6fb 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -207,6 +207,7 @@ static void drm_sched_entity_kill_jobs_cb(struct dma_fence *f,
struct drm_sched_job *job = container_of(cb, struct drm_sched_job,
finish_cb);
+ dma_fence_put(f);
INIT_WORK(&job->work, drm_sched_entity_kill_jobs_work);
schedule_work(&job->work);
}
@@ -234,8 +235,10 @@ static void drm_sched_entity_kill_jobs(struct drm_sched_entity *entity)
struct drm_sched_fence *s_fence = job->s_fence;
/* Wait for all dependencies to avoid data corruptions */
- while ((f = drm_sched_job_dependency(job, entity)))
+ while ((f = drm_sched_job_dependency(job, entity))) {
dma_fence_wait(f, false);
+ dma_fence_put(f);
+ }
drm_sched_fence_scheduled(s_fence);
dma_fence_set_error(&s_fence->finished, -ESRCH);
@@ -250,6 +253,7 @@ static void drm_sched_entity_kill_jobs(struct drm_sched_entity *entity)
continue;
}
+ dma_fence_get(entity->last_scheduled);
r = dma_fence_add_callback(entity->last_scheduled,
&job->finish_cb,
drm_sched_entity_kill_jobs_cb);
