netfilter: nf_tables: use rhashtable_lookup() instead of rhashtable_lookup_fast()

Internally, rhashtable_lookup_fast() calls rcu_read_lock() then,
calls rhashtable_lookup(). so that in places where are guaranteed
by rcu read lock, rhashtable_lookup() is enough.
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_flow_table_core.c

@@ -233,8 +233,8 @@ flow_offload_lookup(struct nf_flowtable *flow_table,
 	struct flow_offload *flow;
 	int dir;
 
-	tuplehash = rhashtable_lookup_fast(&flow_table->rhashtable, tuple,
-					   nf_flow_offload_rhash_params);
+	tuplehash = rhashtable_lookup(&flow_table->rhashtable, tuple,
+				      nf_flow_offload_rhash_params);
 	if (!tuplehash)
 		return NULL;
 

net/netfilter/nft_set_hash.c

@@ -88,7 +88,7 @@ static bool nft_rhash_lookup(const struct net *net, const struct nft_set *set,
 		.key	 = key,
 	};
 
-	he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params);
+	he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
 	if (he != NULL)
 		*ext = &he->ext;
 
@@ -106,7 +106,7 @@ static void *nft_rhash_get(const struct net *net, const struct nft_set *set,
 		.key	 = elem->key.val.data,
 	};
 
-	he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params);
+	he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
 	if (he != NULL)
 		return he;
 
@@ -129,7 +129,7 @@ static bool nft_rhash_update(struct nft_set *set, const u32 *key,
 		.key	 = key,
 	};
 
-	he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params);
+	he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
 	if (he != NULL)
 		goto out;
 
@@ -217,7 +217,7 @@ static void *nft_rhash_deactivate(const struct net *net,
 	};
 
 	rcu_read_lock();
-	he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params);
+	he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
 	if (he != NULL &&
 	    !nft_rhash_flush(net, set, he))
 		he = NULL;