[PATCH net-next] mptcp: fix deadlock in mptcp_close()

[Dan Carpenter <dan.carpenter@oracle.com>]

The mptcp_data_lock/unlock(sk) functions are taking the same spin lock
as the lock_sock()/release_sock() functions.  So we're already holding
the lock at this point and taking it again will lead to a deadlock.

Fixes: 4293248c6704 ("mptcp: add data lock for sk timers")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
From static analysis.  Not tested.

 net/mptcp/protocol.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index a5d466e6b538..eef4673dae3a 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2872,9 +2872,7 @@ static void mptcp_close(struct sock *sk, long timeout)
 		__mptcp_destroy_sock(sk);
 		do_cancel_work = true;
 	} else {
-		mptcp_data_lock(sk);
 		sk_reset_timer(sk, &sk->sk_timer, jiffies + TCP_TIMEWAIT_LEN);
-		mptcp_data_unlock(sk);
 	}
 	release_sock(sk);
 	if (do_cancel_work)
-- 
2.35.1