--- kernel/mutex.c

+++ kernel/mutex.c

@@ -172,6 +172,13 @@ __mutex_lock_common(struct mutex *lock,

struct thread_info *owner;

/*

+ * If we own the BKL, then don't spin. The owner of

+ * the mutex might be waiting on us to release the BKL.

+ */

+ if (unlikely(current->lock_depth >= 0))

+ break;

+

+ /*

* If there's an owner, wait for it to either

* release the lock or go to sleep.

*/