[Intel-gfx] [PATCH] drm/i915/gt: Flush GT interrupt handler before changing interrupt state

[Chris Wilson]

Before we clear any state that may be being written by an interrupt
handler on another core, flush the interrupt handlers.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_execlists_submission.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 740ff05fd692..7ec9c809a4db 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -2662,7 +2662,10 @@ static void enable_error_interrupt(struct intel_engine_cs *engine)
 {
 	u32 status;
 
+	/* Flush ongoing GT interrupts before touching interrupt state */
+	synchronize_hardirq(engine->i915->drm.irq);
 	engine->execlists.error_interrupt = 0;
+
 	ENGINE_WRITE(engine, RING_EMR, ~0u);
 	ENGINE_WRITE(engine, RING_EIR, ~0u); /* clear all existing errors */
 
-- 
2.20.1