--- zzzz-none-000/linux-4.1.38/kernel/locking/mutex-debug.c	2017-01-18 18:48:06.000000000 +0000
+++ bcm63-7582-715/linux-4.1.38/kernel/locking/mutex-debug.c	2020-11-25 10:06:48.000000000 +0000
@@ -72,6 +72,17 @@
 void debug_mutex_unlock(struct mutex *lock)
 {
 	if (likely(debug_locks)) {
+#if defined(CONFIG_BCM_KF_MUTEX_FIX)
+       /*
+        * debug_locks is set to 0 by add_taint() when a proprietary module
+        * is loaded.  But mutex owner is recorded regardless of debug_locks
+        * or proprietary module.  We just need to clear the owner so that
+        * our own mutex assert code works.
+        */
+       if (unlikely(!debug_locks))
+               mutex_clear_owner(lock);
+#endif
+
 		DEBUG_LOCKS_WARN_ON(lock->magic != lock);
 
 		if (!lock->owner)