fc_handle_to_dtree
if (fc_find_node(pdev, fc_handle_to_dtree(rp)) == NULL)
fc_add_child(cdev, pdev, fc_handle_to_dtree(rp));
struct fc_device_tree *subtree = fc_handle_to_dtree(rp);
struct fc_device_tree *fc_handle_to_dtree(fco_handle_t);