Subject: [PATCH 6/6] net: phy: Stop 'phy-state-machine' and 'phy_change' work on remove

From: Neil Armstrong <[email-masked]>
Date: Tue, 27 Oct 2015 15:49:21 +0100

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 <[email-masked]>
Signed-off-by: Neil Armstrong <[email-masked]>
---
 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