[Bug 87955] WARNING: CPU: 6 PID: 102 at drivers/gpu/drm/i915/intel_display.c:8977 intel_fb_obj_invalidate+0xe1/0xf0 [i915]()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87955

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
Actually:

diff --git a/kernel/locking/mutex-debug.c b/kernel/locking/mutex-debug.c
index 5cf6731..3ef3736 100644
--- a/kernel/locking/mutex-debug.c
+++ b/kernel/locking/mutex-debug.c
@@ -80,13 +80,13 @@ void debug_mutex_unlock(struct mutex *lock)
                        DEBUG_LOCKS_WARN_ON(lock->owner != current);

                DEBUG_LOCKS_WARN_ON(!lock->wait_list.prev &&
!lock->wait_list.next);
-               mutex_clear_owner(lock);
        }

        /*
         * __mutex_slowpath_needs_to_unlock() is explicitly 0 for debug
         * mutexes so that we can do it here after we've verified state.
         */
+       mutex_clear_owner(lock);
        atomic_set(&lock->count, 1);
 }

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