rhashtable: Move masking back into key_hashfn

This patch reverts commit c88455ce
("rhashtable: key_hashfn() must return full hash value") because
the only user of it always masks the hash value.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Acked-by: NThomas Graf <tgraf@suug.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

lib/rhashtable.c

@@ -83,7 +83,8 @@ static u32 obj_raw_hashfn(struct rhashtable *ht,
 static u32 key_hashfn(struct rhashtable *ht, const struct bucket_table *tbl,
 		      const void *key, u32 len)
 {
-	return ht->p.hashfn(key, len, tbl->hash_rnd) >> HASH_RESERVED_SPACE;
+	return rht_bucket_index(tbl, ht->p.hashfn(key, len, tbl->hash_rnd) >>
+				     HASH_RESERVED_SPACE);
 }
 
 static u32 head_hashfn(struct rhashtable *ht,
@@ -622,7 +623,7 @@ void *rhashtable_lookup_compare(struct rhashtable *ht, const void *key,
 	tbl = rht_dereference_rcu(ht->tbl, ht);
 	hash = key_hashfn(ht, tbl, key, ht->p.key_len);
 restart:
-	rht_for_each_rcu(he, tbl, rht_bucket_index(tbl, hash)) {
+	rht_for_each_rcu(he, tbl, hash) {
 		if (!compare(rht_obj(ht, he), arg))
 			continue;
 		rcu_read_unlock();