[PATCH v1] drm/i915/guc: Flush ct receive tasklet during reset preparation

[Zhanjun Dong]

GuC to host communication is interrupt driven, the handling has 3
parts: interrupt context, tasklet and request queue worker.
During GuC reset prepare, interrupt is disabled before destroy
contexts steps start. The IRQ and worker flushed to finish
in progress message handling if there are. The tasklet flush is
missing, it might causes 2 race conditions:
1. Tasklet runs after IRQ flushed, add request to queue after worker
flush started, causes unexpected G2H message request processing,
meanwhile, reset prepare code already get the context destroyed.
This will causes error reported about bad context state.
2. Tasklet runs after intel_guc_submission_reset_prepare,
ct_try_receive_message start to run, while intel_uc_reset_prepare
already finished guc sanitize and set ct->enable to false. This will
causes warning on incorrect ct->enable state.

Add the missing tasklet flush to flush all 3 parts.

Signed-off-by: Zhanjun Dong <zhanjun.dong at intel.com>
Cc: John Harrison <John.C.Harrison at Intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 9ede6f240d79..353a9167c9a4 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1688,6 +1688,10 @@ void intel_guc_submission_reset_prepare(struct intel_guc *guc)
 	spin_lock_irq(guc_to_gt(guc)->irq_lock);
 	spin_unlock_irq(guc_to_gt(guc)->irq_lock);
 
+	/* Flush tasklet */
+	tasklet_disable(&guc->ct.receive_tasklet);
+	tasklet_enable(&guc->ct.receive_tasklet);
+
 	guc_flush_submissions(guc);
 	guc_flush_destroyed_contexts(guc);
 	flush_work(&guc->ct.requests.worker);
-- 
2.34.1