[PATCH] drm/xe: cancel pending job timer before freeing scheduler

[Tejas Upadhyay]

Async call to __guc_exec_queue_fini_async frees scheduler
at the same time when some scheduler submission would have
timed out and restarted. To handle such small window race
case, all pending jobs timer should be cancelled before
freeing scheduler.

It will help to solve below which is not easily reproducible,
https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/4223

V2(MattB):
 - Cancel pending jobs before scheduler finish

Signed-off-by: Tejas Upadhyay <tejas.upadhyay at intel.com>
---
 drivers/gpu/drm/xe/xe_guc_submit.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_guc_submit.c b/drivers/gpu/drm/xe/xe_guc_submit.c
index f2ce3086838c..8b7165d3820b 100644
--- a/drivers/gpu/drm/xe/xe_guc_submit.c
+++ b/drivers/gpu/drm/xe/xe_guc_submit.c
@@ -1258,6 +1258,8 @@ static void __guc_exec_queue_fini_async(struct work_struct *w)
 		cancel_work_sync(&ge->lr_tdr);
 	release_guc_id(guc, q);
 	xe_sched_entity_fini(&ge->entity);
+	/* Confirm no work left behind accessing device structures */
+	cancel_delayed_work_sync(&ge->sched.base.work_tdr);
 	xe_sched_fini(&ge->sched);
 
 	kfree(ge);
-- 
2.34.1