From 2ef3219e49701c273d16d55bf8fcbd3c6f422ae0 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Tue, 15 Aug 2006 00:06:56 -0700
Subject: [PATCH] --- yaml --- r: 33397 b: refs/heads/master c:
 640c41c77a96dbbfb74d40ae86ab75b759afb911 h: refs/heads/master i:   33395:
 935e36f461fe1b7851cf56b21b1c4339d276c2de v: v3

---
 [refs]                |  2 +-
 trunk/net/ipv6/icmp.c | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index efdbe1acd680..b7534dc57ca2 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: deb47c66e12a645f7eec9b1c153c05ed47989439
+refs/heads/master: 640c41c77a96dbbfb74d40ae86ab75b759afb911
diff --git a/trunk/net/ipv6/icmp.c b/trunk/net/ipv6/icmp.c
index 1044b6fce0d5..3d6e9a351150 100644
--- a/trunk/net/ipv6/icmp.c
+++ b/trunk/net/ipv6/icmp.c
@@ -712,6 +712,11 @@ static int icmpv6_rcv(struct sk_buff **pskb)
 	return 0;
 }
 
+/*
+ * Special lock-class for __icmpv6_socket:
+ */
+static struct lock_class_key icmpv6_socket_sk_dst_lock_key;
+
 int __init icmpv6_init(struct net_proto_family *ops)
 {
 	struct sock *sk;
@@ -730,6 +735,14 @@ int __init icmpv6_init(struct net_proto_family *ops)
 
 		sk = per_cpu(__icmpv6_socket, i)->sk;
 		sk->sk_allocation = GFP_ATOMIC;
+		/*
+		 * Split off their lock-class, because sk->sk_dst_lock
+		 * gets used from softirqs, which is safe for
+		 * __icmpv6_socket (because those never get directly used
+		 * via userspace syscalls), but unsafe for normal sockets.
+		 */
+		lockdep_set_class(&sk->sk_dst_lock,
+				  &icmpv6_socket_sk_dst_lock_key);
 
 		/* Enough space for 2 64K ICMP packets, including
 		 * sk_buff struct overhead.