linux-kernel - net: pxa168_eth: Fix a potential data race in pxa168_eth

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Message-ID: <20210618093526.GA20534@duo.ucw.cz>
Date:   Fri, 18 Jun 2021 11:35:26 +0200
From:   Pavel Machek <pavel@...x.de>
To:     davem@...emloft.net
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Zhang Changzhong <zhangchangzhong@...wei.com>,
        Pavel Andrianov <andrianov@...ras.ru>,
        Michael Walle <michael@...le.cc>, Andrew Lunn <andrew@...n.ch>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: net: pxa168_eth: Fix a potential data race in pxa168_eth_remove

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")
    
diff --git a/drivers/net/ethernet/marvell/pxa168_eth.c b/drivers/net/ethernet/marvell/pxa168_eth.c
index e967867828d8..9b48ae4bac39 100644
--- a/drivers/net/ethernet/marvell/pxa168_eth.c
+++ b/drivers/net/ethernet/marvell/pxa168_eth.c
@@ -1528,6 +1528,7 @@ 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);
@@ -1539,7 +1540,6 @@ 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;

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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