linux-kernel - [PATCH v2] net/mlx5_core/health: Remove deprecated create_singlethread

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Date:	Tue, 26 Jul 2016 22:38:24 +0530
From:	Bhaktipriya Shridhar <bhaktipriya96@...il.com>
To:	Matan Barak <matanb@...lanox.com>,
	Leon Romanovsky <leonro@...lanox.com>
Cc:	netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>
Subject: [PATCH v2] net/mlx5_core/health: Remove deprecated
 create_singlethread_workqueue

The workqueue health->wq was used as per device private health thread.
This was done to perform delayed work.

The workqueue has a single workitem(&health->work) and
hence doesn't require ordering. It is involved in handling the health of
the device and is not being used on a memory reclaim path.
Hence, the singlethreaded workqueue has been replaced with the use of
system_wq.

Work item has been flushed in mlx5_health_cleanup() to ensure that
there are no pending tasks while disconnecting the driver.

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@...il.com>
---
 Changes in v2:
	-Updated commit description as per the feedback received.

 drivers/net/ethernet/mellanox/mlx5/core/health.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/health.c b/drivers/net/ethernet/mellanox/mlx5/core/health.c
index 42d16b9..9acbccf 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/health.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/health.c
@@ -267,7 +267,7 @@ static void poll_health(unsigned long data)
 	if (in_fatal(dev) && !health->sick) {
 		health->sick = true;
 		print_health_info(dev);
-		queue_work(health->wq, &health->work);
+		schedule_work(&health->work);
 	}
 }

@@ -296,7 +296,7 @@ void mlx5_health_cleanup(struct mlx5_core_dev *dev)
 {
 	struct mlx5_core_health *health = &dev->priv.health;

-	destroy_workqueue(health->wq);
+	flush_work(&health->work);
 }

 int mlx5_health_init(struct mlx5_core_dev *dev)
@@ -311,10 +311,7 @@ int mlx5_health_init(struct mlx5_core_dev *dev)

 	strcpy(name, "mlx5_health");
 	strcat(name, dev_name(&dev->pdev->dev));
-	health->wq = create_singlethread_workqueue(name);
 	kfree(name);
-	if (!health->wq)
-		return -ENOMEM;

 	INIT_WORK(&health->work, health_care);

--
2.1.4