[patch 53/61] lock validator: special locking: bh_lock_sock()

[Ingo Molnar]

From: Ingo Molnar <mingo@xxxxxxx>

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

Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
---
 include/net/sock.h  |    3 +++
 net/ipv4/tcp_ipv4.c |    2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

Index: linux/include/net/sock.h
===================================================================
--- linux.orig/include/net/sock.h
+++ linux/include/net/sock.h
@@ -743,6 +743,9 @@ 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,
Index: linux/net/ipv4/tcp_ipv4.c
===================================================================
--- linux.orig/net/ipv4/tcp_ipv4.c
+++ linux/net/ipv4/tcp_ipv4.c
@@ -1088,7 +1088,7 @@ process:
 
 	skb->dev = NULL;
 
-	bh_lock_sock(sk);
+	bh_lock_sock_nested(sk);
 	ret = 0;
 	if (!sock_owned_by_user(sk)) {
 		if (!tcp_prequeue(sk, skb))
-
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