From 1e061ab2e5aa50a84d68ca654773632f9c425bb6 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Sat, 18 Jun 2005 22:56:42 -0700
Subject: [SCTP]: Replace spin_lock_irqsave with spin_lock_bh

This patch replaces the spin_lock_irqsave call on the receive queue
lock in SCTP with spin_lock_bh.  Despite the proliferation of
spin_lock_irqsave calls in this stack, it is only entered from the
IPv4/IPv6 stack and user space.  That is, it is never entered from
hardirq context.

The call in question is only called from recvmsg which means that
IRQs aren't disabled.  Therefore it is safe to replace it with
spin_lock_bh.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/sctp/socket.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

(limited to 'net')

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 2a3c0e08a090..e6926cb19420 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4368,15 +4368,11 @@ static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
 		 *  However, this function was corrent in any case. 8)
 		 */
 		if (flags & MSG_PEEK) {
-			unsigned long cpu_flags;
-
-			sctp_spin_lock_irqsave(&sk->sk_receive_queue.lock,
-					       cpu_flags);
+			spin_lock_bh(&sk->sk_receive_queue.lock);
 			skb = skb_peek(&sk->sk_receive_queue);
 			if (skb)
 				atomic_inc(&skb->users);
-			sctp_spin_unlock_irqrestore(&sk->sk_receive_queue.lock,
-						    cpu_flags);
+			spin_unlock_bh(&sk->sk_receive_queue.lock);
 		} else {
 			skb = skb_dequeue(&sk->sk_receive_queue);
 		}
-- 
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