From: Ingo Molnar <mingo@elte.hu>

Teach special (recursive) locking code to the lock validator.  Has no effect
on non-lockdep kernels.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 include/net/sock.h  |    3 +++
 net/ipv4/tcp_ipv4.c |    2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff -puN include/net/sock.h~lockdep-annotate-bh_lock_sock include/net/sock.h
--- a/include/net/sock.h~lockdep-annotate-bh_lock_sock
+++ a/include/net/sock.h
@@ -750,6 +750,9 @@ extern void FASTCALL(release_sock(struct
 
 /* BH context may only use the following locking interface. */
 #define bh_lock_sock(__sk)	spin_lock(&((__sk)->sk_lock.slock))
+#define bh_lock_sock_nested(__sk) \
+				spin_lock_nested(&((__sk)->sk_lock.slock), \
+				SINGLE_DEPTH_NESTING)
 #define bh_unlock_sock(__sk)	spin_unlock(&((__sk)->sk_lock.slock))
 
 extern struct sock		*sk_alloc(int family,
diff -puN net/ipv4/tcp_ipv4.c~lockdep-annotate-bh_lock_sock net/ipv4/tcp_ipv4.c
--- a/net/ipv4/tcp_ipv4.c~lockdep-annotate-bh_lock_sock
+++ a/net/ipv4/tcp_ipv4.c
@@ -1089,7 +1089,7 @@ process:
 
 	skb->dev = NULL;
 
-	bh_lock_sock(sk);
+	bh_lock_sock_nested(sk);
 	ret = 0;
 	if (!sock_owned_by_user(sk)) {
 #ifdef CONFIG_NET_DMA
_