From 381744f8062239c3e08b9c79f8f7941c521d46c2 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 21 Nov 2016 11:07:59 +0000 Subject: [PATCH] drm/i915: Add a warning on shutdown if signal threads still active When unloading the module, it is expected that we have finished executing all requests and so the signal threads should be idle. Add a warning in case there are any residual requests in the signaler rbtrees at that point. v2: We can also warn if there are any waiters Signed-off-by: Chris Wilson Reviewed-by: Tvrtko Ursulin Link: http://patchwork.freedesktop.org/patch/msgid/20161121110759.22896-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/intel_breadcrumbs.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c index c9c46a538edb..53ae7884babd 100644 --- a/drivers/gpu/drm/i915/intel_breadcrumbs.c +++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c @@ -623,6 +623,12 @@ void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine) { struct intel_breadcrumbs *b = &engine->breadcrumbs; + /* The engines should be idle and all requests accounted for! */ + WARN_ON(READ_ONCE(b->first_wait)); + WARN_ON(!RB_EMPTY_ROOT(&b->waiters)); + WARN_ON(READ_ONCE(b->first_signal)); + WARN_ON(!RB_EMPTY_ROOT(&b->signals)); + if (!IS_ERR_OR_NULL(b->signaler)) kthread_stop(b->signaler); -- 2.20.1