[PATCH 01/13] drm/scheduler: fix fence ref counting

[Christian König]

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.koe...@amd.com>
---
 drivers/gpu/drm/scheduler/sched_entity.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/scheduler/sched_entity.c 
b/drivers/gpu/drm/scheduler/sched_entity.c
index 43d337d8b153..243ff384cde8 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_irq_work(&job->work, drm_sched_entity_kill_jobs_irq_work);
        irq_work_queue(&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);
-- 
2.25.1