[PATCH] caif-hsi: Remove deprecated create_singlethread_workqueue

[PATCH] caif-hsi: Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

alloc_workqueue replaces deprecated create_singlethread_workqueue().

A dedicated workqueue has been used since the workitems are being used
on a packet tx/rx path. Hence, WQ_MEM_RECLAIM has been set to guarantee
forward progress under memory pressure.

An ordered workqueue has been used since workitems &cfhsi->wake_up_work
and &cfhsi->wake_down_work cannot be run concurrently.

Calls to flush_workqueue() before destroy_workqueue() have been dropped
since destroy_workqueue() itself calls drain_workqueue() which flushes
repeatedly till the workqueue becomes empty.

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
---
 drivers/net/caif/caif_hsi.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/net/caif/caif_hsi.c b/drivers/net/caif/caif_hsi.c
index 615c65d..ddabce7 100644
--- a/drivers/net/caif/caif_hsi.c
+++ b/drivers/net/caif/caif_hsi.c
@@ -1201,7 +1201,7 @@ static int cfhsi_open(struct net_device *ndev)
 	clear_bit(CFHSI_AWAKE, &cfhsi->bits);

 	/* Create work thread. */
-	cfhsi->wq = create_singlethread_workqueue(cfhsi->ndev->name);
+	cfhsi->wq = alloc_ordered_workqueue(cfhsi->ndev->name, WQ_MEM_RECLAIM);
 	if (!cfhsi->wq) {
 		netdev_err(cfhsi->ndev, "%s: Failed to create work queue.\n",
 			__func__);
@@ -1267,9 +1267,6 @@ static int cfhsi_close(struct net_device *ndev)
 	/* going to shutdown driver */
 	set_bit(CFHSI_SHUTDOWN, &cfhsi->bits);

-	/* Flush workqueue */
-	flush_workqueue(cfhsi->wq);
-
 	/* Delete timers if pending */
 	del_timer_sync(&cfhsi->inactivity_timer);
 	del_timer_sync(&cfhsi->rx_slowpath_timer);
--
2.1.4

Re: [PATCH] caif-hsi: Remove deprecated create_singlethread_workqueue

[Tejun Heo]

On Mon, Jul 25, 2016 at 06:40:57PM +0530, Bhaktipriya Shridhar wrote:
> alloc_workqueue replaces deprecated create_singlethread_workqueue().
> 
> A dedicated workqueue has been used since the workitems are being used
> on a packet tx/rx path. Hence, WQ_MEM_RECLAIM has been set to guarantee
> forward progress under memory pressure.
> 
> An ordered workqueue has been used since workitems &cfhsi->wake_up_work
> and &cfhsi->wake_down_work cannot be run concurrently.
> 
> Calls to flush_workqueue() before destroy_workqueue() have been dropped
> since destroy_workqueue() itself calls drain_workqueue() which flushes
> repeatedly till the workqueue becomes empty.
> 
> Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

-- 
tejun

Re: [PATCH] caif-hsi: Remove deprecated create_singlethread_workqueue

[David Miller]

From: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Date: Mon, 25 Jul 2016 18:40:57 +0530

> alloc_workqueue replaces deprecated create_singlethread_workqueue().
> 
> A dedicated workqueue has been used since the workitems are being used
> on a packet tx/rx path. Hence, WQ_MEM_RECLAIM has been set to guarantee
> forward progress under memory pressure.
> 
> An ordered workqueue has been used since workitems &cfhsi->wake_up_work
> and &cfhsi->wake_down_work cannot be run concurrently.
> 
> Calls to flush_workqueue() before destroy_workqueue() have been dropped
> since destroy_workqueue() itself calls drain_workqueue() which flushes
> repeatedly till the workqueue becomes empty.
> 
> Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>

Applied.