rwsem: Test for no active locks in __rwsem_do_wake undo code

[pandora-kernel.git] / lib / rwsem.c

diff --git a/lib/rwsem.c b/lib/rwsem.c
index 3e3365e..ceba8e2 100644 (file)
--- a/lib/rwsem.c
+++ b/lib/rwsem.c
@@ -136,9 +136,10 @@ __rwsem_do_wake(struct rw_semaphore *sem, int downgrading)
  out:
        return sem;
 
-       /* undo the change to count, but check for a transition 1->0 */
+       /* undo the change to the active count, but check for a transition
+        * 1->0 */
  undo:
-       if (rwsem_atomic_update(-RWSEM_ACTIVE_BIAS, sem) != 0)
+       if (rwsem_atomic_update(-RWSEM_ACTIVE_BIAS, sem) & RWSEM_ACTIVE_MASK)
                goto out;
        goto try_again;
 }