[Intel-gfx] [PATCH] drm/i915/gt: Don't flush the tasklet if not setup

[Chris Wilson]

If the tasklet is not being used, don't try and flush it.

Fixes: 594893870044 ("drm/i915/gt: Add a safety submission flush in the heartbeat")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_engine_cs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 31049e0bdb57..045179c65c44 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -1094,6 +1094,9 @@ void intel_engine_flush_submission(struct intel_engine_cs *engine)
 {
 	struct tasklet_struct *t = &engine->execlists.tasklet;
 
+	if (!t->func)
+		return;
+
 	/* Synchronise and wait for the tasklet on another CPU */
 	tasklet_kill(t);
 
-- 
2.20.1