[PATCH] drm/scheduler: Partially revert "drm/scheduler: track GPU active time per entity"

[xinhui pan <xinhui.pan@xxxxxxx>]

This patch partially revert commit df622729ddbf ("drm/scheduler: track
GPU active time per entity") which touchs entity without any reference.

I notice there is one memory overwritten from gpu scheduler side.
The case is like below.
A(drm_sched_main)			B(vm fini)
drm_sched_job_begin			drm_sched_entity_kill
	//job in pending_list			wait_for_completion
complete_all				...
...					kfree entity
drm_sched_get_cleanup_job
	//fetch job from pending_list
	access job->entity //memory overwitten

As long as we can NOT guarantee entity is alive in this case, lets
revert it for now.

Signed-off-by: xinhui pan <xinhui.pan@xxxxxxx>
---
 drivers/gpu/drm/scheduler/sched_main.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 602361c690c9..1b3f1a6a8514 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -907,12 +907,6 @@ drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched)
 
 	spin_unlock(&sched->job_list_lock);
 
-	if (job) {
-		job->entity->elapsed_ns += ktime_to_ns(
-			ktime_sub(job->s_fence->finished.timestamp,
-				  job->s_fence->scheduled.timestamp));
-	}
-
 	return job;
 }
 
-- 
2.34.1