[CRIU] [PATCH 2/2] lock: prevent unlocking an unlocked mutex

[Andrey Vagin]

Signed-off-by: Andrey Vagin <avagin at openvz.org>
---
 include/lock.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/lock.h b/include/lock.h
index 515655e..2a1f9af 100644
--- a/include/lock.h
+++ b/include/lock.h
@@ -128,7 +128,12 @@ static void inline mutex_lock(mutex_t *m)
 static void inline mutex_unlock(mutex_t *m)
 {
 	u32 c = 0;
-	atomic_set(&m->raw, c);
+	int ret;
+	ret = atomic_set(&m->raw, c);
+	if (ret == 0) {
+		pr_err("Unlock an unlocked mutex\n");
+		BUG();
+	}
 	BUG_ON(sys_futex(&m->raw.counter, FUTEX_WAKE, 1, NULL, NULL, 0) < 0);
 }
 
-- 
1.7.11.7