Commit 7cd10db8 authored by Thomas Graf's avatar Thomas Graf Committed by David S. Miller

rhashtable: Add more lock verification

Catch hash miscalculations which result in hard to track down race
conditions.
Signed-off-by: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a03eaec0
......@@ -348,9 +348,11 @@ static bool hashtable_chain_unzip(struct rhashtable *ht,
return !rht_is_a_nulls(p);
}
static void link_old_to_new(struct bucket_table *new_tbl,
static void link_old_to_new(struct rhashtable *ht, struct bucket_table *new_tbl,
unsigned int new_hash, struct rhash_head *entry)
{
ASSERT_BUCKET_LOCK(ht, new_tbl, new_hash);
rcu_assign_pointer(*bucket_tail(new_tbl, new_hash), entry);
}
......@@ -406,7 +408,7 @@ int rhashtable_expand(struct rhashtable *ht)
lock_buckets(new_tbl, old_tbl, new_hash);
rht_for_each(he, old_tbl, old_hash) {
if (head_hashfn(ht, new_tbl, he) == new_hash) {
link_old_to_new(new_tbl, new_hash, he);
link_old_to_new(ht, new_tbl, new_hash, he);
break;
}
}
......@@ -492,6 +494,7 @@ int rhashtable_shrink(struct rhashtable *ht)
rcu_assign_pointer(*bucket_tail(new_tbl, new_hash),
tbl->buckets[new_hash]);
ASSERT_BUCKET_LOCK(ht, tbl, new_hash + new_tbl->size);
rcu_assign_pointer(*bucket_tail(new_tbl, new_hash),
tbl->buckets[new_hash + new_tbl->size]);
......@@ -557,6 +560,8 @@ static void __rhashtable_insert(struct rhashtable *ht, struct rhash_head *obj,
struct rhash_head *head = rht_dereference_bucket(tbl->buckets[hash],
tbl, hash);
ASSERT_BUCKET_LOCK(ht, tbl, hash);
if (rht_is_a_nulls(head))
INIT_RHT_NULLS_HEAD(obj->next, ht, hash);
else
......@@ -641,6 +646,7 @@ restart:
continue;
}
ASSERT_BUCKET_LOCK(ht, tbl, hash);
rcu_assign_pointer(*pprev, obj->next);
ret = true;
......
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