Re: [PATCH] drm/sched: Avoid data corruptions

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Am 19.05.21 um 16:14 schrieb Andrey Grodzovsky:
Wait for all dependencies of a job  to complete before
killing it to avoid data corruptions.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>

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

---
  drivers/gpu/drm/scheduler/sched_entity.c | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
index 2e93e881b65f..d5cf61972558 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -222,11 +222,16 @@ static void drm_sched_entity_kill_jobs_cb(struct dma_fence *f,
  static void drm_sched_entity_kill_jobs(struct drm_sched_entity *entity)
  {
  	struct drm_sched_job *job;
+	struct dma_fence *f;
  	int r;
while ((job = to_drm_sched_job(spsc_queue_pop(&entity->job_queue)))) {
  		struct drm_sched_fence *s_fence = job->s_fence;
+ /* Wait for all dependencies to avoid data corruptions */
+		while ((f = job->sched->ops->dependency(job, entity)))
+			dma_fence_wait(f);
+
  		drm_sched_fence_scheduled(s_fence);
  		dma_fence_set_error(&s_fence->finished, -ESRCH);

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