[IPV6]: make frag to return an error at initialization

This patch makes the frag_init to return an error code, so the af_inet6
module can handle the error.
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/transp_v6.h

@@ -19,7 +19,8 @@ struct flowi;
 /* extention headers */
 extern int				ipv6_exthdrs_init(void);
 extern void				ipv6_exthdrs_exit(void);
-extern void				ipv6_frag_init(void);
+extern int				ipv6_frag_init(void);
+extern void				ipv6_frag_exit(void);
 
 /* transport protocols */
 extern void				rawv6_init(void);

net/ipv6/af_inet6.c

@@ -863,7 +863,9 @@ static int __init inet6_init(void)
 	if (err)
 		goto ipv6_exthdrs_fail;
 
-	ipv6_frag_init();
+	err = ipv6_frag_init();
+	if (err)
+		goto ipv6_frag_fail;
 
 	/* Init v6 transport protocols. */
 	udpv6_init();
@@ -875,6 +877,8 @@ static int __init inet6_init(void)
 out:
 	return err;
 
+ipv6_frag_fail:
+	ipv6_exthdrs_exit();
 ipv6_exthdrs_fail:
 	addrconf_cleanup();
 addrconf_fail:
@@ -934,7 +938,7 @@ static void __exit inet6_exit(void)
 
 	/* Cleanup code parts. */
 	ipv6_packet_cleanup();
-
+	ipv6_frag_exit();
 	ipv6_exthdrs_exit();
 	addrconf_cleanup();
 	ip6_flowlabel_cleanup();

net/ipv6/reassembly.c

@@ -632,11 +632,13 @@ static struct inet6_protocol frag_protocol =
 	.flags		=	INET6_PROTO_NOPOLICY,
 };
 
-void __init ipv6_frag_init(void)
+int __init ipv6_frag_init(void)
 {
-	if (inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT) < 0)
-		printk(KERN_ERR "ipv6_frag_init: Could not register protocol\n");
+	int ret;
 
+	ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
+	if (ret)
+		goto out;
 	ip6_frags.ctl = &ip6_frags_ctl;
 	ip6_frags.hashfn = ip6_hashfn;
 	ip6_frags.constructor = ip6_frag_init;
@@ -646,4 +648,12 @@ void __init ipv6_frag_init(void)
 	ip6_frags.match = ip6_frag_match;
 	ip6_frags.frag_expire = ip6_frag_expire;
 	inet_frags_init(&ip6_frags);
+out:
+	return ret;
+}
+
+void ipv6_frag_exit(void)
+{
+	inet_frags_fini(&ip6_frags);
+	inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
 }