+ /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP
+ * xmit operations conclude prior to an unregistration call. Thus
+ * sk->sk_state cannot change, so we don't need to do lock_sock().
+ * But, we also can't do a lock_sock since that introduces a potential
+ * deadlock as we'd reverse the lock ordering used when calling
+ * ppp_unregister_channel().
+ */
+