netdev - [PATCH] phy: check if parent device is NULL

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Message-ID: <87oa06upl5.fsf@babayev.com>
Date:   Tue, 20 Dec 2016 15:51:22 -0800 (PST)
From:   Ruslan Babayev <ruslan@...ayev.com>
To:     netdev@...r.kernel.org
Cc:     f.fainelli@...il.com
Subject: [PATCH] phy: check if parent device is NULL

Fixes a crash observed on Octeon.

Signed-off-by: Ruslan Babayev <ruslan@...ayev.com>
Fixes: ec988ad78ed6 ("phy: Don't increment MDIO bus refcount unless it's a
different owner")
---
 drivers/net/phy/phy_device.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 9c06f8028f0c..043328b85643 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -905,7 +905,8 @@ EXPORT_SYMBOL(phy_attached_print);
 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
 		      u32 flags, phy_interface_t interface)
 {
-	struct module *ndev_owner = dev->dev.parent->driver->owner;
+	struct device *parent = dev->dev.parent;
+	struct module *ndev_owner = parent ? parent->driver->owner : NULL;
 	struct mii_bus *bus = phydev->mdio.bus;
 	struct device *d = &phydev->mdio.dev;
 	int err;
-- 
2.7.4