diff
+ static void netvsc_free_recv_buf(struct netvsc_device *nvdev) {
+ 	if (atomic_dec_and_test(&nvdev->recv_buf_refcount)) {
+ 		vfree(nvdev->recv_buf);
+ 		nvdev->recv_buf = NULL;
+ 	}
+ }

// In the main function:
- 	vfree(nvdev->recv_buf);
+ 	netvsc_free_recv_buf(nvdev);
