diff --git a/sys/dev/drm/include/linux/dma-buf.h b/sys/dev/drm/include/linux/dma-buf.h
index 9f30c79..f098cad 100644
--- a/sys/dev/drm/include/linux/dma-buf.h
+++ b/sys/dev/drm/include/linux/dma-buf.h
@@ -96,8 +96,8 @@ void dma_buf_unmap_attachment(struct dma_buf_attachment *,
 static inline struct dma_buf_attachment *
 dma_buf_attach(struct dma_buf *dmabuf, struct device *dev)
 {
-	STUB();
-	return NULL;
+	kprintf("dma_buf_attach: not implemented\n");
+	return ERR_PTR(-ENOSYS);
 }
 
 static inline void
@@ -126,7 +126,7 @@ static inline void
 dma_buf_detach(struct dma_buf *dmabuf,
 	       struct dma_buf_attachment *dmabuf_attach)
 {
-	panic("dma_buf_attach is not implemented");
+	/* attachment creation always fails on this port; nothing to undo */
 }
 
 #endif /* LINUX_DMA_BUF_H */