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authorJesper Dangaard Brouer <hawk@comx.dk>2009-06-25 16:32:52 +0200
committerPatrick McHardy <kaber@trash.net>2009-06-25 16:32:52 +0200
commit308ff823ebd749a94d3b6ac26b95bc0eb114c39e (patch)
tree990a750303525a9f643a584a71aa8ac81c568d78
parent28d0325ce6e0a52f53d8af687e6427fee59004d3 (diff)
nf_conntrack: Use rcu_barrier()
RCU barriers, rcu_barrier(), is inserted two places. In nf_conntrack_expect.c nf_conntrack_expect_fini() before the kmem_cache_destroy(). Firstly to make sure the callback to the nf_ct_expect_free_rcu() code is still around. Secondly because I'm unsure about the consequence of having in flight nf_ct_expect_free_rcu/kmem_cache_free() calls while doing a kmem_cache_destroy() slab destroy. And in nf_conntrack_extend.c nf_ct_extend_unregister(), inorder to wait for completion of callbacks to __nf_ct_ext_free_rcu(), which is invoked by __nf_ct_ext_add(). It might be more efficient to call rcu_barrier() in nf_conntrack_core.c nf_conntrack_cleanup_net(), but thats make it more difficult to read the code (as the callback code in located in nf_conntrack_extend.c). Signed-off-by: Jesper Dangaard Brouer <hawk@comx.dk> Signed-off-by: Patrick McHardy <kaber@trash.net>
-rw-r--r--net/netfilter/nf_conntrack_expect.c4
-rw-r--r--net/netfilter/nf_conntrack_extend.c2
2 files changed, 4 insertions, 2 deletions
diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index afde8f99164..2032dfe25ca 100644
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -617,8 +617,10 @@ err1:
void nf_conntrack_expect_fini(struct net *net)
{
exp_proc_remove(net);
- if (net_eq(net, &init_net))
+ if (net_eq(net, &init_net)) {
+ rcu_barrier(); /* Wait for call_rcu() before destroy */
kmem_cache_destroy(nf_ct_expect_cachep);
+ }
nf_ct_free_hashtable(net->ct.expect_hash, net->ct.expect_vmalloc,
nf_ct_expect_hsize);
}
diff --git a/net/netfilter/nf_conntrack_extend.c b/net/netfilter/nf_conntrack_extend.c
index 4b2c769d555..fef95be334b 100644
--- a/net/netfilter/nf_conntrack_extend.c
+++ b/net/netfilter/nf_conntrack_extend.c
@@ -186,6 +186,6 @@ void nf_ct_extend_unregister(struct nf_ct_ext_type *type)
rcu_assign_pointer(nf_ct_ext_types[type->id], NULL);
update_alloc_size(type);
mutex_unlock(&nf_ct_ext_type_mutex);
- synchronize_rcu();
+ rcu_barrier(); /* Wait for completion of call_rcu()'s */
}
EXPORT_SYMBOL_GPL(nf_ct_extend_unregister);