[PATCH 2/2] net/core: add lock context change annotations in net/core/sock.c

[Namhyung Kim]

__lock_sock() and __release_sock() releases and regrabs lock but
were missing proper annotations. Add it. This removes following
warning from sparse. (Currently __lock_sock() does not emit any
warning about it but I think it is better to add also.)

 net/core/sock.c:1580:17: warning: context imbalance in '__release_sock' - unexpected unlock

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxx>
---
 net/core/sock.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index b05b9b6..f3a06c4 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1557,6 +1557,8 @@ struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
 EXPORT_SYMBOL(sock_alloc_send_skb);
 
 static void __lock_sock(struct sock *sk)
+	__releases(&sk->sk_lock.slock)
+	__acquires(&sk->sk_lock.slock)
 {
 	DEFINE_WAIT(wait);
 
@@ -1573,6 +1575,8 @@ static void __lock_sock(struct sock *sk)
 }
 
 static void __release_sock(struct sock *sk)
+	__releases(&sk->sk_lock.slock)
+	__acquires(&sk->sk_lock.slock)
 {
 	struct sk_buff *skb = sk->sk_backlog.head;
 
-- 
1.7.2.2

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