linux-kernel - [088/117] sctp: per_cpu variables should be in bh

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Message-Id: <20100510223325.330981902@kvm.kroah.org>
Date:	Mon, 10 May 2010 15:32:59 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Vlad Yasevich <vladislav.yasevich@...com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [088/117] sctp: per_cpu variables should be in bh_disabled section

2.6.33-stable review patch.  If anyone has any objections, please let us know.

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


From: Vlad Yasevich <vladislav.yasevich@...com>

[ Upstream commit 81419d862db743fe4450a021893f24bab4698c1d ]

Since the change of the atomics to percpu variables, we now
have to disable BH in process context when touching percpu variables.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@...com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/sctp/socket.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3718,12 +3718,12 @@ SCTP_STATIC int sctp_init_sock(struct so
 	sp->hmac = NULL;
 
 	SCTP_DBG_OBJCNT_INC(sock);
-	percpu_counter_inc(&sctp_sockets_allocated);
 
 	/* Set socket backlog limit. */
 	sk->sk_backlog.limit = sysctl_sctp_rmem[1];
 
 	local_bh_disable();
+	percpu_counter_inc(&sctp_sockets_allocated);
 	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 	local_bh_enable();
 
@@ -3740,8 +3740,8 @@ SCTP_STATIC void sctp_destroy_sock(struc
 	/* Release our hold on the endpoint. */
 	ep = sctp_sk(sk)->ep;
 	sctp_endpoint_free(ep);
-	percpu_counter_dec(&sctp_sockets_allocated);
 	local_bh_disable();
+	percpu_counter_dec(&sctp_sockets_allocated);
 	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 	local_bh_enable();
 }


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