[Intel-xe] [PATCH] drm/xe: Call __guc_engine_fini_async direct for KERNEL engines

[Matthew Brost <matthew.brost@intel.com>]

Usually we call __guc_engine_fini_async via a worker as the engine fini
can be done from within the GPU scheduler which creates a circular
dependency without a worker. Kernel engines are fini'd at driver unload
(not from within the GPU scheduler) so it is safe to directly call
__guc_engine_fini_async.

Reported-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_guc_submit.c | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_guc_submit.c b/drivers/gpu/drm/xe/xe_guc_submit.c
index 911d4965c27c..6cb64a097297 100644
--- a/drivers/gpu/drm/xe/xe_guc_submit.c
+++ b/drivers/gpu/drm/xe/xe_guc_submit.c
@@ -943,27 +943,19 @@ static void __guc_engine_fini_async(struct work_struct *w)
 	drm_sched_entity_fini(&ge->entity);
 	drm_sched_fini(&ge->sched);
 
-	if (!(e->flags & ENGINE_FLAG_KERNEL)) {
-		kfree(ge);
-		xe_engine_fini(e);
-	}
+	kfree(ge);
+	xe_engine_fini(e);
 }
 
 static void guc_engine_fini_async(struct xe_engine *e)
 {
-	bool kernel = e->flags & ENGINE_FLAG_KERNEL;
-
 	INIT_WORK(&e->guc->fini_async, __guc_engine_fini_async);
-	queue_work(system_wq, &e->guc->fini_async);
 
 	/* We must block on kernel engines so slabs are empty on driver unload */
-	if (kernel) {
-		struct xe_guc_engine *ge = e->guc;
-
-		flush_work(&ge->fini_async);
-		kfree(ge);
-		xe_engine_fini(e);
-	}
+	if (e->flags & ENGINE_FLAG_KERNEL)
+		__guc_engine_fini_async(&e->guc->fini_async);
+	else
+		queue_work(system_wq, &e->guc->fini_async);
 }
 
 static void __guc_engine_fini(struct xe_guc *guc, struct xe_engine *e)
-- 
2.34.1