linux-kernel - [PATCH 03/20] habanalabs: use single threaded WQ for event handling

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Date:   Thu, 17 Nov 2022 18:19:34 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Dani Liberman <dliberman@...ana.ai>
Subject: [PATCH 03/20] habanalabs: use single threaded WQ for event handling

From: Dani Liberman <dliberman@...ana.ai>

Creating event queue workqueue using alloc_workqueue made it run in
multi threaded mode, which caused parallel dumping of events as well as
parallel events notifying to user, causing logs with multiple
events to be out of order.

Fixed by creating event queue workqueue as single threaded work queue.

Signed-off-by: Dani Liberman <dliberman@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index d1a609589558..65bb40f81901 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -787,7 +787,7 @@ static int device_early_init(struct hl_device *hdev)
 		}
 	}
 
-	hdev->eq_wq = alloc_workqueue("hl-events", WQ_UNBOUND, 0);
+	hdev->eq_wq = create_singlethread_workqueue("hl-events");
 	if (hdev->eq_wq == NULL) {
 		dev_err(hdev->dev, "Failed to allocate EQ workqueue\n");
 		rc = -ENOMEM;
-- 
2.25.1