linux-kernel - [PATCH 6/6] net: phy: Stop 'phy-state-machine' and 'phy

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Message-ID: <562F8EF1.5090504@baylibre.com>
Date:	Tue, 27 Oct 2015 15:49:21 +0100
From:	Neil Armstrong <narmstrong@...libre.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	vivien.didelot@...oirfairelinux.com,
	Fabian Frederick <fabf@...net.be>,
	Pavel Nakonechny <pavel.nakonechny@...tlab.ru>,
	Joe Perches <joe@...ches.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Frode Isaksen <fisaksen@...libre.com>
Subject: [PATCH 6/6] net: phy: Stop 'phy-state-machine' and 'phy_change' work
 on remove

Avoids:
 Unable to handle kernel NULL pointer dereference at virtual address 00000064
 Workqueue: events_power_efficient phy_state_machine
 PC is at phy_state_machine+0x28/0x480

Signed-off-by: Frode Isaksen <fisaksen@...libre.com>
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/net/phy/phy_device.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 3833891..b5b6c1b 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1348,6 +1348,12 @@ static int phy_remove(struct device *dev)
 	phydev->state = PHY_DOWN;
 	mutex_unlock(&phydev->lock);

+	cancel_delayed_work_sync(&phydev->state_queue);
+	flush_delayed_work(&phydev->state_queue);
+
+	cancel_work_sync(&phydev->phy_queue);
+	flush_work(&phydev->phy_queue);
+
 	if (phydev->drv->remove)
 		phydev->drv->remove(phydev);
 	phydev->drv = NULL;
-- 
1.9.1
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