linux-kernel - [PATCH v2 07/33] staging: wfx: fix atomic accesses in wfx_tx_queue

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Message-Id: <20210913083045.1881321-8-Jerome.Pouiller@silabs.com>
Date:   Mon, 13 Sep 2021 10:30:19 +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 v2 07/33] staging: wfx: fix atomic accesses in wfx_tx_queue_empty()

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

Checking if a skb_queue is empty is not an atomic operation. We should
take some precautions to do it.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 drivers/staging/wfx/queue.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/wfx/queue.c b/drivers/staging/wfx/queue.c
index 31c37f69c295..fa272c120f1c 100644
--- a/drivers/staging/wfx/queue.c
+++ b/drivers/staging/wfx/queue.c
@@ -86,7 +86,8 @@ void wfx_tx_queues_check_empty(struct wfx_vif *wvif)
 
 bool wfx_tx_queue_empty(struct wfx_vif *wvif, struct wfx_queue *queue)
 {
-	return skb_queue_empty(&queue->normal) && skb_queue_empty(&queue->cab);
+	return skb_queue_empty_lockless(&queue->normal) &&
+	       skb_queue_empty_lockless(&queue->cab);
 }
 
 static void __wfx_tx_queue_drop(struct wfx_vif *wvif,
-- 
2.33.0