[RFC v6 2/9] drm/i915/guc: Sanitize engine submission on disable

[Michal Wajdeczko]

WIP

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
---
 drivers/gpu/drm/i915/intel_guc_submission.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c
index 207cda0..ef90514 100644
--- a/drivers/gpu/drm/i915/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/intel_guc_submission.c
@@ -1247,14 +1247,26 @@ int intel_guc_submission_enable(struct intel_guc *guc)
 void intel_guc_submission_disable(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
 
-	GEM_BUG_ON(dev_priv->gt.awake); /* GT should be parked first */
+	WARN_ON(dev_priv->gt.awake); /* GT should be parked first */
 
 	guc_interrupts_release(dev_priv);
 	guc_clients_doorbell_fini(guc);
 
 	/* Revert back to manual ELSP submission */
 	intel_engines_reset_default_submission(dev_priv);
+
+	for_each_engine(engine, dev_priv, id) {
+		struct intel_engine_execlists * const execlists =
+			&engine->execlists;
+
+		execlists->tasklet.func = NULL;
+		engine->schedule = NULL;
+		engine->park = NULL;
+		engine->unpark = NULL;
+	}
 }
 
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
-- 
1.9.1