--- y/drivers/dma-buf/udmabuf.c
+++ u/drivers/dma-buf/udmabuf.c
@@ -273,6 +273,14 @@ static long udmabuf_create(struct miscde
 	if (IS_ERR(buf)) {
 		ret = PTR_ERR(buf);
 		goto err;
+	} else {
+		struct device *dev = ubuf->device->this_device;
+
+		if (!dev->dma_mask) {
+			ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
+			if (ret)
+				goto err;
+		}
 	}
 
 	flags = 0;