When parking the engines and their breadcrumbs, if we have waiters left
then they missed their wakeup. Verify that each waiter's seqno did
complete.

Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
---
 drivers/gpu/drm/i915/intel_breadcrumbs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c 
b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index be50c2bebdf0..15a7ad998fe8 100644
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -243,6 +243,8 @@ void intel_engine_disarm_breadcrumbs(struct intel_engine_cs 
*engine)
        spin_unlock(&b->irq_lock);
 
        rbtree_postorder_for_each_entry_safe(wait, n, &b->waiters, node) {
+               GEM_BUG_ON(!i915_seqno_passed(intel_engine_get_seqno(engine),
+                                             wait->seqno));
                RB_CLEAR_NODE(&wait->node);
                wake_up_process(wait->tsk);
        }
-- 
2.16.1

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