From 61881cfb5ad80c1d0a46ca6d08b7e271892b2ff6 Mon Sep 17 00:00:00 2001 From: Hannes Frederic Sowa Date: Tue, 5 Apr 2016 17:10:14 +0200 Subject: sock: fix lockdep annotation in release_sock During release_sock we use callbacks to finish the processing of outstanding skbs on the socket. We actually are still locked, sk_locked.owned == 1, but we already told lockdep that the mutex is released. This could lead to false positives in lockdep for lockdep_sock_is_held (we don't hold the slock spinlock during processing the outstanding skbs). I took over this patch from Eric Dumazet and tested it. Signed-off-by: Eric Dumazet Signed-off-by: Hannes Frederic Sowa Signed-off-by: David S. Miller --- include/net/sock.h | 7 ++++++- net/core/sock.c | 5 ----- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/include/net/sock.h b/include/net/sock.h index 1decb7a22261..91cee51086dc 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -1333,7 +1333,12 @@ static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) static inline void sock_release_ownership(struct sock *sk) { - sk->sk_lock.owned = 0; + if (sk->sk_lock.owned) { + sk->sk_lock.owned = 0; + + /* The sk_lock has mutex_unlock() semantics: */ + mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); + } } /* diff --git a/net/core/sock.c b/net/core/sock.c index 2ce76e82857f..152274d188ef 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -2483,11 +2483,6 @@ EXPORT_SYMBOL(lock_sock_nested); void release_sock(struct sock *sk) { - /* - * The sk_lock has mutex_unlock() semantics: - */ - mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); - spin_lock_bh(&sk->sk_lock.slock); if (sk->sk_backlog.tail) __release_sock(sk); -- cgit v1.2.3-58-ga151