netdev - [PATCH AUTOSEL 4.19 1/3] net: mac802154: Fix racy device stats updates by DEV_STATS_INC() and DEV_STATS

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Message-ID: <20240716143043.2714553-1-sashal@kernel.org>
Date: Tue, 16 Jul 2024 10:30:40 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Yunshui Jiang <jiangyunshui@...inos.cn>,
	Stefan Schmidt <stefan@...enfreihafen.org>,
	Sasha Levin <sashal@...nel.org>,
	alex.aring@...il.com,
	miquel.raynal@...tlin.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	linux-wpan@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 1/3] net: mac802154: Fix racy device stats updates by DEV_STATS_INC() and DEV_STATS_ADD()

From: Yunshui Jiang <jiangyunshui@...inos.cn>

[ Upstream commit b8ec0dc3845f6c9089573cb5c2c4b05f7fc10728 ]

mac802154 devices update their dev->stats fields locklessly. Therefore
these counters should be updated atomically. Adopt SMP safe DEV_STATS_INC()
and DEV_STATS_ADD() to achieve this.

Signed-off-by: Yunshui Jiang <jiangyunshui@...inos.cn>
Message-ID: <20240531080739.2608969-1-jiangyunshui@...inos.cn>
Signed-off-by: Stefan Schmidt <stefan@...enfreihafen.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/mac802154/tx.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c
index 2f873a0dc5836..0f192174a5693 100644
--- a/net/mac802154/tx.c
+++ b/net/mac802154/tx.c
@@ -42,8 +42,8 @@ void ieee802154_xmit_worker(struct work_struct *work)
 	if (res)
 		goto err_tx;
 
-	dev->stats.tx_packets++;
-	dev->stats.tx_bytes += skb->len;
+	DEV_STATS_INC(dev, tx_packets);
+	DEV_STATS_ADD(dev, tx_bytes, skb->len);
 
 	ieee802154_xmit_complete(&local->hw, skb, false);
 
@@ -94,8 +94,8 @@ ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
 			goto err_tx;
 		}
 
-		dev->stats.tx_packets++;
-		dev->stats.tx_bytes += len;
+		DEV_STATS_INC(dev, tx_packets);
+		DEV_STATS_ADD(dev, tx_bytes, len);
 	} else {
 		local->tx_skb = skb;
 		queue_work(local->workqueue, &local->tx_work);
-- 
2.43.0