netdev - [PATCH] tcp: fix a panic on UP machines in reqsk_fastopen

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Date:	Sun, 13 Jan 2013 20:21:51 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Ketan Kulkarni <ketkulka@...il.com>,
	Jerry Chu <hkchu@...gle.com>, Yuchung Cheng <ycheng@...gle.com>
Subject: [PATCH] tcp: fix a panic on UP machines in reqsk_fastopen_remove

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

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>
---
 net/core/request_sock.c |    2 --
 1 file changed, 2 deletions(-)

diff --git a/net/core/request_sock.c b/net/core/request_sock.c
index c31d9e8..4425148 100644
--- a/net/core/request_sock.c
+++ b/net/core/request_sock.c
@@ -186,8 +186,6 @@ void reqsk_fastopen_remove(struct sock *sk, struct request_sock *req,
 	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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