linux-kernel - [PATCH] iwlwifi: dvm: convert create_singlethread_workqueue() to alloc

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Date:	Thu, 17 Mar 2016 20:37:26 +0800
From:	Eva Rachel Retuya <eraretuya@...il.com>
To:	outreachy-kernel@...glegroups.com
Cc:	johannes.berg@...el.com, emmanuel.grumbach@...el.com,
	linuxwifi@...el.com, kvalo@...eaurora.org,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, tj@...nel.org,
	Eva Rachel Retuya <eraretuya@...il.com>
Subject: [PATCH] iwlwifi: dvm: convert create_singlethread_workqueue() to alloc_workqueue()

Use alloc_workqueue() to allocate the workqueue instead of
create_singlethread_workqueue() since the latter is deprecated and is scheduled
for removal.

There are work items doing related operations that shouldn't be swapped when
queued in a certain order hence preserve the strict execution ordering of a
single threaded (ST) workqueue by setting max_active to 1 and adding the
WQ_UNBOUND flag.

In addition, there are work items dealing with temperature throttling (tt_work,
ct_enter, ct_exit). Adding the WQ_HIGHPRI flag would place the work items in a
high priority workqueue.

Lastly, guarantee forward progress for work items depended upon during memory
reclaim by the addition of the WQ_MEM_RECLAIM flag.

Signed-off-by: Eva Rachel Retuya <eraretuya@...il.com>
---
To the maintainers:
Just to confirm, are work items depended upon during memory reclaim? If not, the WQ_MEM_RECLAIM flag will be dropped. I added it just in case since create_singlethread_workqueue() also sets this flag.

 drivers/net/wireless/intel/iwlwifi/dvm/main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/main.c b/drivers/net/wireless/intel/iwlwifi/dvm/main.c
index f62c2d7..37fa11c 100644
--- a/drivers/net/wireless/intel/iwlwifi/dvm/main.c
+++ b/drivers/net/wireless/intel/iwlwifi/dvm/main.c
@@ -1071,7 +1071,8 @@ static void iwl_bg_restart(struct work_struct *data)

 static void iwl_setup_deferred_work(struct iwl_priv *priv)
 {
-	priv->workqueue = create_singlethread_workqueue(DRV_NAME);
+	priv->workqueue = alloc_workqueue(DRV_NAME, WQ_HIGHPRI | WQ_UNBOUND |
+					  WQ_MEM_RECLAIM, 1);

 	INIT_WORK(&priv->restart, iwl_bg_restart);
 	INIT_WORK(&priv->beacon_update, iwl_bg_beacon_update);
-- 
1.9.1