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net: phy: Fix PHY unbind crash

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commit 7b9a88a390dacb37b051a7b09b9a08f546edf5eb upstream.

The PHY library does not deal very well with bind and unbind events. The first
thing we would see is that we were not properly canceling the PHY state machine
workqueue, so we would be crashing while dereferencing phydev->drv since there
is no driver attached anymore.

Suggested-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Florian Fainelli 2017-02-17 16:07:33 -08:00 • committed by Greg Kroah-Hartman
parent a8f1b40bb2
commit 2933fb22de
1 changed files with 2 additions and 0 deletions
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2
drivers/net/phy/phy_device.c
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@ -1368,6 +1368,8 @@ static int phy_remove(struct device *dev)
{
struct phy_device *phydev = to_phy_device(dev);
cancel_delayed_work_sync(&phydev->state_queue);
mutex_lock(&phydev->lock);
phydev->state = PHY_DOWN;
mutex_unlock(&phydev->lock);