diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
index f4489efc94a7..22b0fde6ba34 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
@@ -195,6 +195,9 @@ check_io_mapping(struct nv50_instmem *imem)
 {
 	struct nvkm_device *device = imem->base.subdev.device;
 
+	if (imem->iomap.size)
+		return true;
+
 	return io_mapping_init_wc(&imem->iomap,
 				  device->func->resource_addr(device, NVKM_BAR2_INST),
 				  device->func->resource_size(device, NVKM_BAR2_INST)) != NULL;