From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Thu, 21 Dec 2017 19:04:15 +0100
Subject: drm/ttm: drop the spin in delayed delete if the trylock doesn't work
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Git-commit: 6a83a553033d6c3d8fb4683a9c87833ace44121b
Patch-mainline: v4.16-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Thomas actually noticed that, but I didn't realized what he meant until
now.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Roger He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -592,6 +592,8 @@ static bool ttm_bo_delayed_delete(struct
 
 		} else if (reservation_object_trylock(bo->resv)) {
 			ttm_bo_cleanup_refs(bo, false, !remove_all, true);
+		} else {
+			spin_unlock(&glob->lru_lock);
 		}
 
 		kref_put(&bo->list_kref, ttm_bo_release_list);