linux-kernel - [PATCH 07/32] staging: wfx: avoid useless wake

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Date:   Wed,  1 Apr 2020 13:03:40 +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 07/32] staging: wfx: avoid useless wake_up

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

__wfx_flush() wait for all queues to be empty. In current code,
wait_link_id_empty is wake up each time there is no more data for a
station. We can simplify the processing and avoid some wake-up by
raising this event only when the queue is empty.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 drivers/staging/wfx/queue.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/wfx/queue.c b/drivers/staging/wfx/queue.c
index 1df3b6f28c67..2553f77522d9 100644
--- a/drivers/staging/wfx/queue.c
+++ b/drivers/staging/wfx/queue.c
@@ -190,7 +190,6 @@ static struct sk_buff *wfx_tx_queue_get(struct wfx_dev *wdev,
 	struct sk_buff *item;
 	struct wfx_queue_stats *stats = &wdev->tx_queue_stats;
 	struct wfx_tx_priv *tx_priv;
-	bool wakeup_stats = false;
 
 	spin_lock_bh(&queue->queue.lock);
 	skb_queue_walk(&queue->queue, item) {
@@ -208,12 +207,11 @@ static struct sk_buff *wfx_tx_queue_get(struct wfx_dev *wdev,
 
 		spin_lock_nested(&stats->pending.lock, 1);
 		__skb_queue_tail(&stats->pending, skb);
-		if (!--stats->link_map_cache[tx_priv->link_id])
-			wakeup_stats = true;
+		--stats->link_map_cache[tx_priv->link_id];
 		spin_unlock(&stats->pending.lock);
 	}
 	spin_unlock_bh(&queue->queue.lock);
-	if (wakeup_stats)
+	if (skb_queue_empty(&queue->queue))
 		wake_up(&stats->wait_link_id_empty);
 	return skb;
 }
-- 
2.25.1