ipv6: Do cleanup for ip6_mr_init.

If do not do it, we will get following issues:
1. Leaving junks after inet6_init failing halfway.
2. Leaving proc and notifier junks after ipv6 modules unloading.

Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

3 files changed, 45 insertions, 7 deletions

diff --git a/include/linux/mroute6.h b/include/linux/mroute6.h
index e7989593142b..4c4d6f57d5c5 100644
--- a/include/linux/mroute6.h
+++ b/include/linux/mroute6.h
@@ -135,7 +135,8 @@ extern int ip6_mroute_setsockopt(struct sock *, int, char __user *, int);
 extern int ip6_mroute_getsockopt(struct sock *, int, char __user *, int __user *);
 extern int ip6_mr_input(struct sk_buff *skb);
 extern int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg);
-extern void ip6_mr_init(void);
+extern int ip6_mr_init(void);
+extern void ip6_mr_cleanup(void);
 
 struct mif_device
 {
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 3ce8d2f318c6..6b39af1acb5e 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -953,7 +953,9 @@ static int __init inet6_init(void)
         if (err)
                 goto icmp_fail;
 #ifdef CONFIG_IPV6_MROUTE
-        ip6_mr_init();
+        err = ip6_mr_init();
+        if (err)
+                goto ipmr_fail;
 #endif
         err = ndisc_init();
         if (err)
@@ -1057,6 +1059,10 @@ netfilter_fail:
 igmp_fail:
         ndisc_cleanup();
 ndisc_fail:
+#ifdef CONFIG_IPV6_MROUTE
+        ip6_mr_cleanup();
+ipmr_fail:
+#endif
         icmpv6_cleanup();
 icmp_fail:
         unregister_pernet_subsys(&inet6_net_ops);
@@ -1111,6 +1117,9 @@ static void __exit inet6_exit(void)
         ipv6_netfilter_fini();
         igmp6_cleanup();
         ndisc_cleanup();
+#ifdef CONFIG_IPV6_MROUTE
+        ip6_mr_cleanup();
+#endif
         icmpv6_cleanup();
         rawv6_exit();
 
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 90e763073dc5..cfac26d674ed 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -948,23 +948,51 @@ static struct notifier_block ip6_mr_notifier = {
  *      Setup for IP multicast routing
  */
 
-void __init ip6_mr_init(void)
+int __init ip6_mr_init(void)
 {
+        int err;
+
         mrt_cachep = kmem_cache_create("ip6_mrt_cache",
                                        sizeof(struct mfc6_cache),
                                        0, SLAB_HWCACHE_ALIGN,
                                        NULL);
         if (!mrt_cachep)
-                panic("cannot allocate ip6_mrt_cache");
+                return -ENOMEM;
 
         setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0);
-        register_netdevice_notifier(&ip6_mr_notifier);
+        err = register_netdevice_notifier(&ip6_mr_notifier);
+        if (err)
+                goto reg_notif_fail;
+#ifdef CONFIG_PROC_FS
+        err = -ENOMEM;
+        if (!proc_net_fops_create(&init_net, "ip6_mr_vif", 0, &ip6mr_vif_fops))
+                goto proc_vif_fail;
+        if (!proc_net_fops_create(&init_net, "ip6_mr_cache",
+                                     0, &ip6mr_mfc_fops))
+                goto proc_cache_fail;
+#endif
+        return 0;
+reg_notif_fail:
+        kmem_cache_destroy(mrt_cachep);
 #ifdef CONFIG_PROC_FS
-        proc_net_fops_create(&init_net, "ip6_mr_vif", 0, &ip6mr_vif_fops);
-        proc_net_fops_create(&init_net, "ip6_mr_cache", 0, &ip6mr_mfc_fops);
+proc_vif_fail:
+        unregister_netdevice_notifier(&ip6_mr_notifier);
+proc_cache_fail:
+        proc_net_remove(&init_net, "ip6_mr_vif");
 #endif
+        return err;
 }
 
+void ip6_mr_cleanup(void)
+{
+#ifdef CONFIG_PROC_FS
+        proc_net_remove(&init_net, "ip6_mr_cache");
+        proc_net_remove(&init_net, "ip6_mr_vif");
+#endif
+        unregister_netdevice_notifier(&ip6_mr_notifier);
+        del_timer(&ipmr_expire_timer);
+        kmem_cache_destroy(mrt_cachep);
+}
 
 static int ip6mr_mfc_add(struct mf6cctl *mfc, int mrtsock)
 {