netdev - [PATCH 03/32] staging: wfx: take advantage of ieee80211_{stop/start}

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Date:   Wed,  1 Apr 2020 13:03:36 +0200
From:   Jerome Pouiller <Jerome.Pouiller@...abs.com>
To:     devel@...verdev.osuosl.org, linux-wireless@...r.kernel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jérôme Pouiller 
        <jerome.pouiller@...abs.com>
Subject: [PATCH 03/32] staging: wfx: take advantage of ieee80211_{stop/start}_queues

From: Jérôme Pouiller <jerome.pouiller@...abs.com>

Instead of maintaining stop status for each queue, we can just maintain
a global status for all queues.

In add, wfx_tx_queues_{lock/unlock} are only used when no more
tx_policies are available. Therefore, the counter of recursive locks
("tx_locked_cnt") is useless.

So, wfx_tx_queues_{lock/unlock} can be replaced by
ieee80211_{stop/start}_queues.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 drivers/staging/wfx/data_tx.c | 12 ++++--------
 drivers/staging/wfx/queue.c   | 29 -----------------------------
 drivers/staging/wfx/queue.h   |  3 ---
 3 files changed, 4 insertions(+), 40 deletions(-)

diff --git a/drivers/staging/wfx/data_tx.c b/drivers/staging/wfx/data_tx.c
index 7a7c2518f6cf..889ebc2f5d83 100644
--- a/drivers/staging/wfx/data_tx.c
+++ b/drivers/staging/wfx/data_tx.c
@@ -189,10 +189,8 @@ static int wfx_tx_policy_get(struct wfx_vif *wvif,
 		idx = entry - cache->cache;
 	}
 	wfx_tx_policy_use(cache, &cache->cache[idx]);
-	if (list_empty(&cache->free)) {
-		/* Lock TX queues. */
-		wfx_tx_queues_lock(wvif->wdev);
-	}
+	if (list_empty(&cache->free))
+		ieee80211_stop_queues(wvif->wdev->hw);
 	spin_unlock_bh(&cache->lock);
 	return idx;
 }
@@ -207,10 +205,8 @@ static void wfx_tx_policy_put(struct wfx_vif *wvif, int idx)
 	spin_lock_bh(&cache->lock);
 	locked = list_empty(&cache->free);
 	usage = wfx_tx_policy_release(cache, &cache->cache[idx]);
-	if (locked && !usage) {
-		/* Unlock TX queues. */
-		wfx_tx_queues_unlock(wvif->wdev);
-	}
+	if (locked && !usage)
+		ieee80211_wake_queues(wvif->wdev->hw);
 	spin_unlock_bh(&cache->lock);
 }
 
diff --git a/drivers/staging/wfx/queue.c b/drivers/staging/wfx/queue.c
index 39d9127ce4b9..e3aa1e346c70 100644
--- a/drivers/staging/wfx/queue.c
+++ b/drivers/staging/wfx/queue.c
@@ -55,35 +55,6 @@ void wfx_tx_lock_flush(struct wfx_dev *wdev)
 	wfx_tx_flush(wdev);
 }
 
-void wfx_tx_queues_lock(struct wfx_dev *wdev)
-{
-	int i;
-	struct wfx_queue *queue;
-
-	for (i = 0; i < IEEE80211_NUM_ACS; ++i) {
-		queue = &wdev->tx_queue[i];
-		spin_lock_bh(&queue->queue.lock);
-		if (queue->tx_locked_cnt++ == 0)
-			ieee80211_stop_queue(wdev->hw, queue->queue_id);
-		spin_unlock_bh(&queue->queue.lock);
-	}
-}
-
-void wfx_tx_queues_unlock(struct wfx_dev *wdev)
-{
-	int i;
-	struct wfx_queue *queue;
-
-	for (i = 0; i < IEEE80211_NUM_ACS; ++i) {
-		queue = &wdev->tx_queue[i];
-		spin_lock_bh(&queue->queue.lock);
-		WARN(!queue->tx_locked_cnt, "queue already unlocked");
-		if (--queue->tx_locked_cnt == 0)
-			ieee80211_wake_queue(wdev->hw, queue->queue_id);
-		spin_unlock_bh(&queue->queue.lock);
-	}
-}
-
 /* If successful, LOCKS the TX queue! */
 void wfx_tx_queues_wait_empty_vif(struct wfx_vif *wvif)
 {
diff --git a/drivers/staging/wfx/queue.h b/drivers/staging/wfx/queue.h
index 90bb060d1204..88ee2bf56d11 100644
--- a/drivers/staging/wfx/queue.h
+++ b/drivers/staging/wfx/queue.h
@@ -23,7 +23,6 @@ struct wfx_vif;
 
 struct wfx_queue {
 	struct sk_buff_head	queue;
-	int			tx_locked_cnt;
 	int			link_map_cache[WFX_LINK_ID_MAX];
 	u8			queue_id;
 };
@@ -41,8 +40,6 @@ void wfx_tx_lock_flush(struct wfx_dev *wdev);
 
 void wfx_tx_queues_init(struct wfx_dev *wdev);
 void wfx_tx_queues_deinit(struct wfx_dev *wdev);
-void wfx_tx_queues_lock(struct wfx_dev *wdev);
-void wfx_tx_queues_unlock(struct wfx_dev *wdev);
 void wfx_tx_queues_clear(struct wfx_dev *wdev);
 bool wfx_tx_queues_is_empty(struct wfx_dev *wdev);
 void wfx_tx_queues_wait_empty_vif(struct wfx_vif *wvif);
-- 
2.25.1