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net: introduce lockdep_is_held and update various places to use it

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The socket is either locked if we hold the slock spin_lock for
lock_sock_fast and unlock_sock_fast or we own the lock (sk_lock.owned
!= 0). Check for this and at the same time improve that the current
thread/cpu is really holding the lock.

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa
2016-04-05 17:10:15 +02:00
committed by David S. Miller
parent 61881cfb5a
commit 1e1d04e678
10 changed files with 26 additions and 17 deletions
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12
include/net/sock.h
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@@ -1360,6 +1360,14 @@ do { \
lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \
} while (0)
static bool lockdep_sock_is_held(const struct sock *csk)
{
struct sock *sk = (struct sock *)csk;
return lockdep_is_held(&sk->sk_lock) ||
lockdep_is_held(&sk->sk_lock.slock);
}
void lock_sock_nested(struct sock *sk, int subclass);
static inline void lock_sock(struct sock *sk)
@@ -1598,8 +1606,8 @@ static inline void sk_rethink_txhash(struct sock *sk)
static inline struct dst_entry *
__sk_dst_get(struct sock *sk)
{
return rcu_dereference_check(sk->sk_dst_cache, sock_owned_by_user(sk) ||
lockdep_is_held(&sk->sk_lock.slock));
return rcu_dereference_check(sk->sk_dst_cache,
lockdep_sock_is_held(sk));
}
static inline struct dst_entry *