[PATCH] drm/xe/guc: In guc_ct_send_recv flush g2h worker if g2h resp times out

[Badal Nilawar <badal.nilawar@intel.com>]

It is observed that for GuC CT request G2H IRQ triggered and g2h_worker
queued, but it didn't get opportunity to execute and timeout occurred.
To address this the g2h_worker is being flushed.

Cc: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: Badal Nilawar <badal.nilawar@intel.com>
---
 drivers/gpu/drm/xe/xe_guc_ct.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
index 4b95f75b1546..4a5d7f85d1a0 100644
--- a/drivers/gpu/drm/xe/xe_guc_ct.c
+++ b/drivers/gpu/drm/xe/xe_guc_ct.c
@@ -903,6 +903,17 @@ static int guc_ct_send_recv(struct xe_guc_ct *ct, const u32 *action, u32 len,
 	}
 
 	ret = wait_event_timeout(ct->g2h_fence_wq, g2h_fence.done, HZ);
+
+	/*
+	 * It is observed that for above GuC CT request G2H IRQ triggered
+	 * and g2h_worker queued, but it didn't get opportunity to execute
+	 * and timeout occurred. To address the g2h_worker is being flushed.
+	 */
+	if (!ret) {
+		flush_work(&ct->g2h_worker);
+		ret = wait_event_timeout(ct->g2h_fence_wq, g2h_fence.done, HZ);
+	}
+
 	if (!ret) {
 		xe_gt_err(gt, "Timed out wait for G2H, fence %u, action %04x",
 			  g2h_fence.seqno, action[0]);
-- 
2.34.1