nfnetlink: add nfnl_dereference_protected helper

to avoid overly long line in followup patch.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 28591fa94ba551db11552e26e08f425d8e840739..aebf5cd45602bef7a227d6f75bf63a88894bb2d3 100644 (file)
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -33,6 +33,10 @@ MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NETFILTER);
 
+#define nfnl_dereference_protected(id) \
+       rcu_dereference_protected(table[(id)].subsys, \
+                                 lockdep_nfnl_is_held((id)))
+
 static char __initdata nfversion[] = "0.30";
 
 static struct {
@@ -208,8 +212,7 @@ replay:
                } else {
                        rcu_read_unlock();
                        nfnl_lock(subsys_id);
-                       if (rcu_dereference_protected(table[subsys_id].subsys,
-                               lockdep_is_held(&table[subsys_id].mutex)) != ss ||
+                       if (nfnl_dereference_protected(subsys_id) != ss ||
                            nfnetlink_find_client(type, ss) != nc)
                                err = -EAGAIN;
                        else if (nc->call)
@@ -299,15 +302,13 @@ replay:
        skb->sk = oskb->sk;
 
        nfnl_lock(subsys_id);
-       ss = rcu_dereference_protected(table[subsys_id].subsys,
-                                      lockdep_is_held(&table[subsys_id].mutex));
+       ss = nfnl_dereference_protected(subsys_id);
        if (!ss) {
 #ifdef CONFIG_MODULES
                nfnl_unlock(subsys_id);
                request_module("nfnetlink-subsys-%d", subsys_id);
                nfnl_lock(subsys_id);
-               ss = rcu_dereference_protected(table[subsys_id].subsys,
-                                              lockdep_is_held(&table[subsys_id].mutex));
+               ss = nfnl_dereference_protected(subsys_id);
                if (!ss)
 #endif
                {