mutexes: Give more informative mutex warning in the !lock->owner case

[cascardo/linux.git] / kernel / locking / mutex-debug.c

diff --git a/kernel/locking/mutex-debug.c b/kernel/locking/mutex-debug.c
index 7e3443f..faf6f5b 100644 (file)
--- a/kernel/locking/mutex-debug.c
+++ b/kernel/locking/mutex-debug.c
@@ -75,7 +75,12 @@ void debug_mutex_unlock(struct mutex *lock)
                return;
 
        DEBUG_LOCKS_WARN_ON(lock->magic != lock);
-       DEBUG_LOCKS_WARN_ON(lock->owner != current);
+
+       if (!lock->owner)
+               DEBUG_LOCKS_WARN_ON(!lock->owner);
+       else
+               DEBUG_LOCKS_WARN_ON(lock->owner != current);
+
        DEBUG_LOCKS_WARN_ON(!lock->wait_list.prev && !lock->wait_list.next);
        mutex_clear_owner(lock);
 }