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

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Message-Id: <1475853202-19903-1-git-send-email-xander.huff@ni.com>
Date:   Fri, 7 Oct 2016 10:13:22 -0500
From:   Xander Huff <xander.huff@...com>
To:     nicolas.ferre@...el.com
Cc:     netdev@...r.kernel.org, Nathan Sullivan <nathan.sullivan@...com>,
        linux-kernel@...r.kernel.org, xander.huff@...com,
        Brad Mouring <brad.mouring@...com>
Subject: [PATCH] net: macb: NULL out phydev after removing mdio bus

From: Nathan Sullivan <nathan.sullivan@...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.huff@...com>
Signed-off-by: Nathan Sullivan <nathan.sullivan@...com>
Signed-off-by: Brad Mouring <brad.mouring@...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