bridge: resolve a false alarm of lockdep

Andrei reported a false alarm of lockdep at net/bridge/br_fdb.c:109,
this is because in Andrei's case, a spin_bug() was already triggered
before this, therefore the debug_locks is turned off, lockdep_is_held()
is no longer accurate after that. We should use lockdep_assert_held_once()
instead of lockdep_is_held() to respect debug_locks.

Fixes: 410b3d48f5111 ("bridge: fdb: add proper lock checks in searching functions")
Reported-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 4f598dc..6e08b71 100644 (file)
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -106,7 +106,7 @@ static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
        struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
        struct net_bridge_fdb_entry *fdb;
 
-       WARN_ON_ONCE(!br_hash_lock_held(br));
+       lockdep_assert_held_once(&br->hash_lock);
 
        rcu_read_lock();
        fdb = fdb_find_rcu(head, addr, vid);

diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 2288fca..6136818 100644 (file)
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -531,15 +531,6 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
                              const unsigned char *addr, u16 vid);
 
-static inline bool br_hash_lock_held(struct net_bridge *br)
-{
-#ifdef CONFIG_LOCKDEP
-       return lockdep_is_held(&br->hash_lock);
-#else
-       return true;
-#endif
-}
-
 /* br_forward.c */
 enum br_pkt_type {
        BR_PKT_UNICAST,