drm/sched: Make timeout timer rearm conditional.

We don't want to rearm the timer if driver hook reports
that the device is gone.

v5: Update drm_gpu_sched_stat values in code.
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210512142648.666476-11-andrey.grodzovsky@amd.com

drivers/gpu/drm/scheduler/sched_main.c

@@ -314,6 +314,7 @@ static void drm_sched_job_timedout(struct work_struct *work)
 {
 	struct drm_gpu_scheduler *sched;
 	struct drm_sched_job *job;
+	enum drm_gpu_sched_stat status = DRM_GPU_SCHED_STAT_NOMINAL;
 
 	sched = container_of(work, struct drm_gpu_scheduler, work_tdr.work);
 
@@ -331,7 +332,7 @@ static void drm_sched_job_timedout(struct work_struct *work)
 		list_del_init(&job->list);
 		spin_unlock(&sched->job_list_lock);
 
-		job->sched->ops->timedout_job(job);
+		status = job->sched->ops->timedout_job(job);
 
 		/*
 		 * Guilty job did complete and hence needs to be manually removed
@@ -345,9 +346,11 @@ static void drm_sched_job_timedout(struct work_struct *work)
 		spin_unlock(&sched->job_list_lock);
 	}
 
-	spin_lock(&sched->job_list_lock);
-	drm_sched_start_timeout(sched);
-	spin_unlock(&sched->job_list_lock);
+	if (status != DRM_GPU_SCHED_STAT_ENODEV) {
+		spin_lock(&sched->job_list_lock);
+		drm_sched_start_timeout(sched);
+		spin_unlock(&sched->job_list_lock);
+	}
 }
 
  /**