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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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2
net/socket.c
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@ -1046,7 +1046,7 @@ static int sock_fasync(int fd, struct file *filp, int on)
return -EINVAL;
lock_sock(sk);
wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk));
fasync_helper(fd, filp, on, &wq->fasync_list);
if (!wq->fasync_list)