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>

1 files changed, 33 insertions, 5 deletions

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)
 {