diff --git a/drivers/gpu/drm/nouveau/nouveau_platform.c b/drivers/gpu/drm/nouveau/nouveau_platform.c
index 3691982..f83aa12 100644
--- a/drivers/gpu/drm/nouveau/nouveau_platform.c
+++ b/drivers/gpu/drm/nouveau/nouveau_platform.c
@@ -152,6 +152,7 @@
 					  struct nouveau_platform_gpu *gpu)
 {
 	if (gpu->iommu.domain) {
+		nvkm_mm_fini(&gpu->iommu._mm);
 		iommu_detach_device(gpu->iommu.domain, dev);
 		iommu_domain_free(gpu->iommu.domain);
 	}