[IPV6]: make flowlabel to return an error

This patch makes the flowlab subsystem to return an error code and makes
some cleanup with procfs ifdefs.
The af_inet6 will use the flowlabel init return code to check the initialization
was correct.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 28 insertions, 9 deletions

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 38df94b5fb26..4d9106580950 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -219,7 +219,7 @@ extern struct ipv6_txoptions	*fl6_merge_options(struct ipv6_txoptions * opt_spac
                                                    struct ipv6_txoptions * fopt);
 extern void                     fl6_free_socklist(struct sock *sk);
 extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
-extern void                     ip6_flowlabel_init(void);
+extern int                      ip6_flowlabel_init(void);
 extern void                     ip6_flowlabel_cleanup(void);
 
 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 90d2f723fc46..614f3d905dd1 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -851,7 +851,9 @@ static int __init inet6_init(void)
         err = ip6_route_init();
         if (err)
                 goto ip6_route_fail;
-        ip6_flowlabel_init();
+        err = ip6_flowlabel_init();
+        if (err)
+                goto ip6_flowlabel_fail;
         err = addrconf_init();
         if (err)
                 goto addrconf_fail;
@@ -874,6 +876,7 @@ out:
 
 addrconf_fail:
         ip6_flowlabel_cleanup();
+ip6_flowlabel_fail:
         ip6_route_cleanup();
 ip6_route_fail:
 #ifdef CONFIG_PROC_FS
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index b12cc22e7745..d0babea89819 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -692,20 +692,36 @@ static const struct file_operations ip6fl_seq_fops = {
         .llseek         =       seq_lseek,
         .release        =       seq_release_private,
 };
-#endif
 
+static int ip6_flowlabel_proc_init(struct net *net)
+{
+        if (!proc_net_fops_create(net, "ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops))
+                return -ENOMEM;
+        return 0;
+}
 
-void ip6_flowlabel_init(void)
+static void ip6_flowlabel_proc_fini(struct net *net)
 {
-#ifdef CONFIG_PROC_FS
-        proc_net_fops_create(&init_net, "ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops);
+        proc_net_remove(net, "ip6_flowlabel");
+}
+#else
+static inline int ip6_flowlabel_proc_init(struct net *net)
+{
+        return 0;
+}
+static inline void ip6_flowlabel_proc_fini(struct net *net)
+{
+        return ;
+}
 #endif
+
+int ip6_flowlabel_init(void)
+{
+        return ip6_flowlabel_proc_init(&init_net);
 }
 
 void ip6_flowlabel_cleanup(void)
 {
         del_timer(&ip6_fl_gc_timer);
-#ifdef CONFIG_PROC_FS
-        proc_net_remove(&init_net, "ip6_flowlabel");
-#endif
+        ip6_flowlabel_proc_fini(&init_net);
 }