detail->hash_table[] is traversed using hlist_for_each_entry_rcu
outside an RCU read-side critical section but under the protection
of detail->hash_lock.
Hence, add corresponding lockdep expression to silence false-positive
warnings, and harden RCU lists.
Signed-off-by: Amol Grover <frextrite@xxxxxxxxx>
---
net/sunrpc/cache.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index f740cb51802a..5db5f5b94726 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -97,7 +97,8 @@ static struct cache_head *sunrpc_cache_add_entry(struct cache_detail *detail,
spin_lock(&detail->hash_lock);
/* check if entry appeared while we slept */
- hlist_for_each_entry_rcu(tmp, head, cache_list) {
+ hlist_for_each_entry_rcu(tmp, head, cache_list,
+ lockdep_is_held(&detail->hash_lock)) {
if (detail->match(tmp, key)) {
if (cache_is_expired(detail, tmp)) {
hlist_del_init_rcu(&tmp->cache_list);
--
2.24.1
