linux-kernel - [ 20/61] tcp: fix a panic on UP machines in reqsk_fastopen

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Date:	Tue, 12 Feb 2013 12:34:40 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Ketan Kulkarni <ketkulka@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Jerry Chu <hkchu@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Dave Taht <dave.taht@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 20/61] tcp: fix a panic on UP machines in reqsk_fastopen_remove

3.7-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit cce894bb824429fd312706c7012acae43e725865 ]

spin_is_locked() on a non !SMP build is kind of useless.

BUG_ON(!spin_is_locked(xx)) is guaranteed to crash.

Just remove this check in reqsk_fastopen_remove() as
the callers do hold the socket lock.

Reported-by: Ketan Kulkarni <ketkulka@...il.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Jerry Chu <hkchu@...gle.com>
Cc: Yuchung Cheng <ycheng@...gle.com>
Cc: Dave Taht <dave.taht@...il.com>
Acked-by: H.K. Jerry Chu <hkchu@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/request_sock.c |    2 --
 1 file changed, 2 deletions(-)

--- a/net/core/request_sock.c
+++ b/net/core/request_sock.c
@@ -186,8 +186,6 @@ void reqsk_fastopen_remove(struct sock *
 	struct fastopen_queue *fastopenq =
 	    inet_csk(lsk)->icsk_accept_queue.fastopenq;
 
-	BUG_ON(!spin_is_locked(&sk->sk_lock.slock) && !sock_owned_by_user(sk));
-
 	tcp_sk(sk)->fastopen_rsk = NULL;
 	spin_lock_bh(&fastopenq->lock);
 	fastopenq->qlen--;


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