[PATCH] net: macb: NULL out phydev after removing mdio bus

[Xander Huff]

From: Nathan Sullivan <nathan.sulli...@ni.com>

To ensure the dev->phydev pointer is not used after becoming invalid in
mdiobus_unregister, set it to NULL. This happens when removing the macb
driver without first taking its interface down, since unregister_netdev
will end up calling macb_close.

Signed-off-by: Xander Huff <xander.h...@ni.com>
Signed-off-by: Nathan Sullivan <nathan.sulli...@ni.com>
Signed-off-by: Brad Mouring <brad.mour...@ni.com>
---
 drivers/net/ethernet/cadence/macb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/cadence/macb.c 
b/drivers/net/ethernet/cadence/macb.c
index 63144bb..b32444a 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -3117,6 +3117,7 @@ static int macb_remove(struct platform_device *pdev)
                if (dev->phydev)
                        phy_disconnect(dev->phydev);
                mdiobus_unregister(bp->mii_bus);
+               dev->phydev = NULL;
                mdiobus_free(bp->mii_bus);
 
                /* Shutdown the PHY if there is a GPIO reset */
-- 
1.9.1