linux-kernel - [PATCH 5.12 431/700] net: pxa168_eth: Fix a potential data race in pxa168_eth

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Date:   Mon, 12 Jul 2021 08:08:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Pavel Machek (CIP)" <pavel@...x.de>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 431/700] net: pxa168_eth: Fix a potential data race in pxa168_eth_remove

From: Pavel Machek <pavel@...x.de>

[ Upstream commit bd70957438f0cc4879cbdff8bbc8614bc1cddf49 ]

Commit 0571a753cb07 cancelled delayed work too late, keeping small
race. Cancel work sooner to close it completely.

Signed-off-by: Pavel Machek (CIP) <pavel@...x.de>
Fixes: 0571a753cb07 ("net: pxa168_eth: Fix a potential data race in pxa168_eth_remove")
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/marvell/pxa168_eth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/pxa168_eth.c b/drivers/net/ethernet/marvell/pxa168_eth.c
index 3712e1786091..406fdfe968bf 100644
--- a/drivers/net/ethernet/marvell/pxa168_eth.c
+++ b/drivers/net/ethernet/marvell/pxa168_eth.c
@@ -1533,6 +1533,7 @@ static int pxa168_eth_remove(struct platform_device *pdev)
 	struct net_device *dev = platform_get_drvdata(pdev);
 	struct pxa168_eth_private *pep = netdev_priv(dev);
 
+	cancel_work_sync(&pep->tx_timeout_task);
 	if (pep->htpr) {
 		dma_free_coherent(pep->dev->dev.parent, HASH_ADDR_TABLE_SIZE,
 				  pep->htpr, pep->htpr_dma);
@@ -1544,7 +1545,6 @@ static int pxa168_eth_remove(struct platform_device *pdev)
 	clk_disable_unprepare(pep->clk);
 	mdiobus_unregister(pep->smi_bus);
 	mdiobus_free(pep->smi_bus);
-	cancel_work_sync(&pep->tx_timeout_task);
 	unregister_netdev(dev);
 	free_netdev(dev);
 	return 0;
-- 
2.30.2