lockdep: Fix wrong assumption in match_held_lock

[pandora-kernel.git] / kernel / lockdep.c

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 8c24294..91d67ce 100644 (file)
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -3111,7 +3111,13 @@ static int match_held_lock(struct held_lock *hlock, struct lockdep_map *lock)
                if (!class)
                        class = look_up_lock_class(lock, 0);
 
-               if (DEBUG_LOCKS_WARN_ON(!class))
+               /*
+                * If look_up_lock_class() failed to find a class, we're trying
+                * to test if we hold a lock that has never yet been acquired.
+                * Clearly if the lock hasn't been acquired _ever_, we're not
+                * holding it either, so report failure.
+                */
+               if (!class)
                        return 0;
 
                if (DEBUG_LOCKS_WARN_ON(!hlock->nest_lock))