From: Ben Skeggs <bskeggs@redhat.com>
Date: Fri, 3 Nov 2017 08:37:27 +1000
Subject: drm/nouveau/core/memory: fix missing mutex unlock
Git-commit: 690f43ab1b659a7e072a2a0b33ff5783828c168b
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/nouveau/nvkm/core/memory.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/nouveau/nvkm/core/memory.c
+++ b/drivers/gpu/drm/nouveau/nvkm/core/memory.c
@@ -64,6 +64,7 @@ nvkm_memory_tags_get(struct nvkm_memory
 		}
 
 		refcount_inc(&tags->refcount);
+		mutex_unlock(&fb->subdev.mutex);
 		*ptags = tags;
 		return 0;
 	}