From: Andrey Grodzovsky <redacted>

commit e582951baabba3e278c97169d0acc1e09b24a72e upstream.

To avoid any possible use after free.

Signed-off-by: Andrey Grodzovsky <redacted>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/414814/
CC: stable@vger.kernel.org
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/scheduler/sched_main.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c

@@ -891,6 +891,9 @@ void drm_sched_fini(struct drm_gpu_sched
 	if (sched->thread)
 		kthread_stop(sched->thread);
 
+	/* Confirm no work left behind accessing device structures */
+	cancel_delayed_work_sync(&sched->work_tdr);
+
 	sched->ready = false;
 }
 EXPORT_SYMBOL(drm_sched_fini);