1 files changed, 84 insertions, 45 deletions

diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 7a7646a9565c..f90091a1b9ce 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -992,6 +992,58 @@ static void cleanup_sctp_mibs(void)
         free_percpu(sctp_statistics[1]);
 }
 
+static void sctp_v4_pf_init(void)
+{
+        /* Initialize the SCTP specific PF functions. */
+        sctp_register_pf(&sctp_pf_inet, PF_INET);
+        sctp_register_af(&sctp_af_inet);
+}
+
+static void sctp_v4_pf_exit(void)
+{
+        list_del(&sctp_af_inet.list);
+}
+
+static int sctp_v4_protosw_init(void)
+{
+        int rc;
+
+        rc = proto_register(&sctp_prot, 1);
+        if (rc)
+                return rc;
+
+        /* Register SCTP(UDP and TCP style) with socket layer.  */
+        inet_register_protosw(&sctp_seqpacket_protosw);
+        inet_register_protosw(&sctp_stream_protosw);
+
+        return 0;
+}
+
+static void sctp_v4_protosw_exit(void)
+{
+        inet_unregister_protosw(&sctp_stream_protosw);
+        inet_unregister_protosw(&sctp_seqpacket_protosw);
+        proto_unregister(&sctp_prot);
+}
+
+static int sctp_v4_add_protocol(void)
+{
+        /* Register notifier for inet address additions/deletions. */
+        register_inetaddr_notifier(&sctp_inetaddr_notifier);
+
+        /* Register SCTP with inet layer.  */
+        if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
+                return -EAGAIN;
+
+        return 0;
+}
+
+static void sctp_v4_del_protocol(void)
+{
+        inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
+        unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
+}
+
 /* Initialize the universe into something sensible.  */
 SCTP_STATIC __init int sctp_init(void)
 {
@@ -1035,8 +1087,6 @@ SCTP_STATIC __init int sctp_init(void)
         /* Initialize object count debugging.  */
         sctp_dbg_objcnt_init();
 
-        /* Initialize the SCTP specific PF functions. */
-        sctp_register_pf(&sctp_pf_inet, PF_INET);
         /*
          * 14. Suggested SCTP Protocol Parameter Values
          */
@@ -1194,19 +1244,22 @@ SCTP_STATIC __init int sctp_init(void)
         sctp_sysctl_register();
 
         INIT_LIST_HEAD(&sctp_address_families);
-        sctp_register_af(&sctp_af_inet);
+        sctp_v4_pf_init();
+        sctp_v6_pf_init();
 
-        status = proto_register(&sctp_prot, 1);
-        if (status)
-                goto err_proto_register;
+        /* Initialize the local address list. */
+        INIT_LIST_HEAD(&sctp_local_addr_list);
+        spin_lock_init(&sctp_local_addr_lock);
+        sctp_get_local_addr_list();
 
-        /* Register SCTP(UDP and TCP style) with socket layer.  */
-        inet_register_protosw(&sctp_seqpacket_protosw);
-        inet_register_protosw(&sctp_stream_protosw);
+        status = sctp_v4_protosw_init();
 
-        status = sctp_v6_init();
         if (status)
-                goto err_v6_init;
+                goto err_protosw_init;
+
+        status = sctp_v6_protosw_init();
+        if (status)
+                goto err_v6_protosw_init;
 
         /* Initialize the control inode/socket for handling OOTB packets.  */
         if ((status = sctp_ctl_sock_init())) {
@@ -1215,19 +1268,9 @@ SCTP_STATIC __init int sctp_init(void)
                 goto err_ctl_sock_init;
         }
 
-        /* Initialize the local address list. */
-        INIT_LIST_HEAD(&sctp_local_addr_list);
-        spin_lock_init(&sctp_local_addr_lock);
-        sctp_get_local_addr_list();
-
-        /* Register notifier for inet address additions/deletions. */
-        register_inetaddr_notifier(&sctp_inetaddr_notifier);
-
-        /* Register SCTP with inet layer.  */
-        if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) {
-                status = -EAGAIN;
+        status = sctp_v4_add_protocol();
+        if (status)
                 goto err_add_protocol;
-        }
 
         /* Register SCTP with inet6 layer.  */
         status = sctp_v6_add_protocol();
@@ -1238,18 +1281,18 @@ SCTP_STATIC __init int sctp_init(void)
 out:
         return status;
 err_v6_add_protocol:
-        inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
-        unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
+        sctp_v6_del_protocol();
 err_add_protocol:
-        sctp_free_local_addr_list();
+        sctp_v4_del_protocol();
         sock_release(sctp_ctl_socket);
 err_ctl_sock_init:
-        sctp_v6_exit();
-err_v6_init:
-        inet_unregister_protosw(&sctp_stream_protosw);
-        inet_unregister_protosw(&sctp_seqpacket_protosw);
-        proto_unregister(&sctp_prot);
-err_proto_register:
+        sctp_v6_protosw_exit();
+err_v6_protosw_init:
+        sctp_v4_protosw_exit();
+err_protosw_init:
+        sctp_free_local_addr_list();
+        sctp_v4_pf_exit();
+        sctp_v6_pf_exit();
         sctp_sysctl_unregister();
         list_del(&sctp_af_inet.list);
         free_pages((unsigned long)sctp_port_hashtable,
@@ -1282,23 +1325,21 @@ SCTP_STATIC __exit void sctp_exit(void)
 
         /* Unregister with inet6/inet layers. */
         sctp_v6_del_protocol();
-        inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
-
-        /* Unregister notifier for inet address additions/deletions. */
-        unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
-
-        /* Free the local address list.  */
-        sctp_free_local_addr_list();
+        sctp_v4_del_protocol();
 
         /* Free the control endpoint.  */
         sock_release(sctp_ctl_socket);
 
-        /* Cleanup v6 initializations. */
-        sctp_v6_exit();
+        /* Free protosw registrations */
+        sctp_v6_protosw_exit();
+        sctp_v4_protosw_exit();
+
+        /* Free the local address list.  */
+        sctp_free_local_addr_list();
 
         /* Unregister with socket layer. */
-        inet_unregister_protosw(&sctp_stream_protosw);
-        inet_unregister_protosw(&sctp_seqpacket_protosw);
+        sctp_v6_pf_exit();
+        sctp_v4_pf_exit();
 
         sctp_sysctl_unregister();
         list_del(&sctp_af_inet.list);
@@ -1317,8 +1358,6 @@ SCTP_STATIC __exit void sctp_exit(void)
 
         kmem_cache_destroy(sctp_chunk_cachep);
         kmem_cache_destroy(sctp_bucket_cachep);
-
-        proto_unregister(&sctp_prot);
 }
 
 module_init(sctp_init);