+static __net_init int ppp_init_net(struct net *net)
+{
+ struct ppp_net *pn;
+ int err;
+
+ pn = kzalloc(sizeof(*pn), GFP_KERNEL);
+ if (!pn)
+ return -ENOMEM;
+
+ idr_init(&pn->units_idr);
+ mutex_init(&pn->all_ppp_mutex);
+
+ INIT_LIST_HEAD(&pn->all_channels);
+ INIT_LIST_HEAD(&pn->new_channels);
+
+ spin_lock_init(&pn->all_channels_lock);
+
+ err = net_assign_generic(net, ppp_net_id, pn);
+ if (err) {
+ kfree(pn);
+ return err;
+ }
+
+ return 0;
+}
+
+static __net_exit void ppp_exit_net(struct net *net)
+{
+ struct ppp_net *pn;
+
+ pn = net_generic(net, ppp_net_id);
+ idr_destroy(&pn->units_idr);
+ /*
+ * if someone has cached our net then
+ * further net_generic call will return NULL
+ */
+ net_assign_generic(net, ppp_net_id, NULL);
+ kfree(pn);
+}
+
+static struct pernet_operations ppp_net_ops = {
+ .init = ppp_init_net,
+ .exit = ppp_exit_net,
+};
+