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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        =?UTF-8?q?=C3=85ke=20Rehnman?= <ake.rehnman@gmail.com>,
        Andrew Lunn <andrew@lunn.ch>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.19 019/103] net: phy: marvell: Fix deadlock from wrong locking
Date:   Tue, 29 Jan 2019 12:34:56 +0100
Message-Id: <20190129113200.683226399@linuxfoundation.org>
In-Reply-To: <20190129113159.567154026@linuxfoundation.org>
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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andrew Lunn <andrew@lunn.ch>

[ Upstream commit e0a7328fad9979104f73e19bedca821ef3262ae1 ]

m88e1318_set_wol() takes the lock as part of phy_select_page(). Don't
take the lock again with phy_read(), use the unlocked __phy_read().

Fixes: 424ca4c55121 ("net: phy: marvell: fix paged access races")
Reported-by: Åke Rehnman <ake.rehnman@gmail.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/phy/marvell.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -1451,7 +1451,7 @@ static int m88e1318_set_wol(struct phy_d
 		 * before enabling it if !phy_interrupt_is_valid()
 		 */
 		if (!phy_interrupt_is_valid(phydev))
-			phy_read(phydev, MII_M1011_IEVENT);
+			__phy_read(phydev, MII_M1011_IEVENT);
 
 		/* Enable the WOL interrupt */
 		err = __phy_modify(phydev, MII_88E1318S_PHY_CSIER, 0,