- if (!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed ||
- !ops->start || !ops->stop || !ops->set_channel) {
- pr_err("undefined IEEE802.15.4 device operations\n");
+ if (WARN_ON(!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed ||
+ !ops->start || !ops->stop || !ops->set_channel))