[NETFILTER]: nf_conntrack: switch rwlock to spinlock

With the RCU conversion only write_lock usages of nf_conntrack_lock are
left (except one read_lock that should actually use write_lock in the
H.323 helper). Switch to a spinlock.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 40 insertions, 40 deletions

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index a54bfec61e79..f284dddfc899 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -40,7 +40,7 @@
 
 #define NF_CONNTRACK_VERSION    "0.5.0"
 
-DEFINE_RWLOCK(nf_conntrack_lock);
+DEFINE_SPINLOCK(nf_conntrack_lock);
 EXPORT_SYMBOL_GPL(nf_conntrack_lock);
 
 /* nf_conntrack_standalone needs this */
@@ -199,7 +199,7 @@ destroy_conntrack(struct nf_conntrack *nfct)
 
         rcu_read_unlock();
 
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
         /* Expectations will have been removed in clean_from_lists,
          * except TFTP can create an expectation on the first packet,
          * before connection is in the list, so we need to clean here,
@@ -213,7 +213,7 @@ destroy_conntrack(struct nf_conntrack *nfct)
         }
 
         NF_CT_STAT_INC(delete);
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
 
         if (ct->master)
                 nf_ct_put(ct->master);
@@ -236,12 +236,12 @@ static void death_by_timeout(unsigned long ul_conntrack)
                 rcu_read_unlock();
         }
 
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
         /* Inside lock so preempt is disabled on module removal path.
          * Otherwise we can get spurious warnings. */
         NF_CT_STAT_INC(delete_list);
         clean_from_lists(ct);
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
         nf_ct_put(ct);
 }
 
@@ -303,9 +303,9 @@ void nf_conntrack_hash_insert(struct nf_conn *ct)
         hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
         repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
 
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
         __nf_conntrack_hash_insert(ct, hash, repl_hash);
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert);
 
@@ -342,7 +342,7 @@ __nf_conntrack_confirm(struct sk_buff *skb)
         NF_CT_ASSERT(!nf_ct_is_confirmed(ct));
         pr_debug("Confirming conntrack %p\n", ct);
 
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
 
         /* See if there's one in the list already, including reverse:
            NAT could have grabbed it without realizing, since we're
@@ -368,7 +368,7 @@ __nf_conntrack_confirm(struct sk_buff *skb)
         atomic_inc(&ct->ct_general.use);
         set_bit(IPS_CONFIRMED_BIT, &ct->status);
         NF_CT_STAT_INC(insert);
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
         help = nfct_help(ct);
         if (help && help->helper)
                 nf_conntrack_event_cache(IPCT_HELPER, skb);
@@ -383,7 +383,7 @@ __nf_conntrack_confirm(struct sk_buff *skb)
 
 out:
         NF_CT_STAT_INC(insert_failed);
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
         return NF_DROP;
 }
 EXPORT_SYMBOL_GPL(__nf_conntrack_confirm);
@@ -538,7 +538,7 @@ init_conntrack(const struct nf_conntrack_tuple *tuple,
                 return NULL;
         }
 
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
         exp = nf_ct_find_expectation(tuple);
         if (exp) {
                 pr_debug("conntrack: expectation arrives ct=%p exp=%p\n",
@@ -576,7 +576,7 @@ init_conntrack(const struct nf_conntrack_tuple *tuple,
         hlist_add_head(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL].hnode,
                        &unconfirmed);
 
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
 
         if (exp) {
                 if (exp->expectfn)
@@ -787,7 +787,7 @@ void __nf_ct_refresh_acct(struct nf_conn *ct,
         NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct);
         NF_CT_ASSERT(skb);
 
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
 
         /* Only update if this is not a fixed timeout */
         if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status))
@@ -824,7 +824,7 @@ acct:
         }
 #endif
 
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
 
         /* must be unlocked when calling event cache */
         if (event)
@@ -909,7 +909,7 @@ get_next_corpse(int (*iter)(struct nf_conn *i, void *data),
         struct nf_conn *ct;
         struct hlist_node *n;
 
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
         for (; *bucket < nf_conntrack_htable_size; (*bucket)++) {
                 hlist_for_each_entry(h, n, &nf_conntrack_hash[*bucket], hnode) {
                         ct = nf_ct_tuplehash_to_ctrack(h);
@@ -922,11 +922,11 @@ get_next_corpse(int (*iter)(struct nf_conn *i, void *data),
                 if (iter(ct, data))
                         set_bit(IPS_DYING_BIT, &ct->status);
         }
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
         return NULL;
 found:
         atomic_inc(&ct->ct_general.use);
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
         return ct;
 }
 
@@ -1055,7 +1055,7 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
          * created because of a false negative won't make it into the hash
          * though since that required taking the lock.
          */
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
         for (i = 0; i < nf_conntrack_htable_size; i++) {
                 while (!hlist_empty(&nf_conntrack_hash[i])) {
                         h = hlist_entry(nf_conntrack_hash[i].first,
@@ -1073,7 +1073,7 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
         nf_conntrack_vmalloc = vmalloced;
         nf_conntrack_hash = hash;
         nf_conntrack_hash_rnd = rnd;
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
 
         nf_ct_free_hashtable(old_hash, old_vmalloced, old_size);
         return 0;
diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index a5c8ef01f925..e06bf0028bb1 100644
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -65,9 +65,9 @@ static void nf_ct_expectation_timed_out(unsigned long ul_expect)
 {
         struct nf_conntrack_expect *exp = (void *)ul_expect;
 
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
         nf_ct_unlink_expect(exp);
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
         nf_ct_expect_put(exp);
 }
 
@@ -201,12 +201,12 @@ static inline int expect_matches(const struct nf_conntrack_expect *a,
 /* Generally a bad idea to call this: could have matched already. */
 void nf_ct_unexpect_related(struct nf_conntrack_expect *exp)
 {
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
         if (del_timer(&exp->timeout)) {
                 nf_ct_unlink_expect(exp);
                 nf_ct_expect_put(exp);
         }
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
 }
 EXPORT_SYMBOL_GPL(nf_ct_unexpect_related);
 
@@ -355,7 +355,7 @@ int nf_ct_expect_related(struct nf_conntrack_expect *expect)
 
         NF_CT_ASSERT(master_help);
 
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
         if (!master_help->helper) {
                 ret = -ESHUTDOWN;
                 goto out;
@@ -390,7 +390,7 @@ int nf_ct_expect_related(struct nf_conntrack_expect *expect)
         nf_ct_expect_event(IPEXP_NEW, expect);
         ret = 0;
 out:
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
         return ret;
 }
 EXPORT_SYMBOL_GPL(nf_ct_expect_related);
diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c
index 872c1aa3124c..02563050cc3a 100644
--- a/net/netfilter/nf_conntrack_h323_main.c
+++ b/net/netfilter/nf_conntrack_h323_main.c
@@ -1415,7 +1415,7 @@ static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
                 nf_ct_refresh(ct, skb, info->timeout * HZ);
 
                 /* Set expect timeout */
-                read_lock_bh(&nf_conntrack_lock);
+                spin_lock_bh(&nf_conntrack_lock);
                 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
                                   info->sig_port[!dir]);
                 if (exp) {
@@ -1425,7 +1425,7 @@ static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
                         NF_CT_DUMP_TUPLE(&exp->tuple);
                         set_expect_timeout(exp, info->timeout);
                 }
-                read_unlock_bh(&nf_conntrack_lock);
+                spin_unlock_bh(&nf_conntrack_lock);
         }
 
         return 0;
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 42f781fcba64..b1fd21cc1dbc 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -138,7 +138,7 @@ void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me)
          */
         synchronize_rcu();
 
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
 
         /* Get rid of expectations */
         for (i = 0; i < nf_ct_expect_hsize; i++) {
@@ -160,7 +160,7 @@ void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me)
                 hlist_for_each_entry(h, n, &nf_conntrack_hash[i], hnode)
                         unhelp(h, me);
         }
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_helper_unregister);
 
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index b701dcce0e69..b6a8c089a075 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1220,7 +1220,7 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
                         return err;
         }
 
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
         if (cda[CTA_TUPLE_ORIG])
                 h = __nf_conntrack_find(&otuple, NULL);
         else if (cda[CTA_TUPLE_REPLY])
@@ -1248,7 +1248,7 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
                         atomic_inc(&master_ct->ct_general.use);
                 }
 
-                write_unlock_bh(&nf_conntrack_lock);
+                spin_unlock_bh(&nf_conntrack_lock);
                 err = -ENOENT;
                 if (nlh->nlmsg_flags & NLM_F_CREATE)
                         err = ctnetlink_create_conntrack(cda,
@@ -1281,7 +1281,7 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
         }
 
 out_unlock:
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
         return err;
 }
 
@@ -1614,10 +1614,10 @@ ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
                 struct nf_conn_help *m_help;
 
                 /* delete all expectations for this helper */
-                write_lock_bh(&nf_conntrack_lock);
+                spin_lock_bh(&nf_conntrack_lock);
                 h = __nf_conntrack_helper_find_byname(name);
                 if (!h) {
-                        write_unlock_bh(&nf_conntrack_lock);
+                        spin_unlock_bh(&nf_conntrack_lock);
                         return -EINVAL;
                 }
                 for (i = 0; i < nf_ct_expect_hsize; i++) {
@@ -1632,10 +1632,10 @@ ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
                                 }
                         }
                 }
-                write_unlock_bh(&nf_conntrack_lock);
+                spin_unlock_bh(&nf_conntrack_lock);
         } else {
                 /* This basically means we have to flush everything*/
-                write_lock_bh(&nf_conntrack_lock);
+                spin_lock_bh(&nf_conntrack_lock);
                 for (i = 0; i < nf_ct_expect_hsize; i++) {
                         hlist_for_each_entry_safe(exp, n, next,
                                                   &nf_ct_expect_hash[i],
@@ -1646,7 +1646,7 @@ ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
                                 }
                         }
                 }
-                write_unlock_bh(&nf_conntrack_lock);
+                spin_unlock_bh(&nf_conntrack_lock);
         }
 
         return 0;
@@ -1732,11 +1732,11 @@ ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
         if (err < 0)
                 return err;
 
-        write_lock_bh(&nf_conntrack_lock);
+        spin_lock_bh(&nf_conntrack_lock);
         exp = __nf_ct_expect_find(&tuple);
 
         if (!exp) {
-                write_unlock_bh(&nf_conntrack_lock);
+                spin_unlock_bh(&nf_conntrack_lock);
                 err = -ENOENT;
                 if (nlh->nlmsg_flags & NLM_F_CREATE)
                         err = ctnetlink_create_expect(cda, u3);
@@ -1746,7 +1746,7 @@ ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
         err = -EEXIST;
         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
                 err = ctnetlink_change_expect(exp, cda);
-        write_unlock_bh(&nf_conntrack_lock);
+        spin_unlock_bh(&nf_conntrack_lock);
 
         return err;
 }