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of: of_mdio: Ensure mdio device is a PHY 

of_phy_find_device() is used to find the phy device associated with a
device node. It is expected the node is for a PHY device, but in fact
it could of been probed as a generic MDIO device. Ensure the device is
a PHY before returning it.

Fixes: a9049e0c51 ("mdio: Add support for mdio drivers.")
Reported-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Reported-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Andrew Lunn 2016-01-26 15:12:30 +01:00 committed by David S. Miller
parent bd7c5e3155
commit 6ed742363b
1 changed files with 9 additions and 1 deletions
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10
drivers/of/of_mdio.c
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@ -256,11 +256,19 @@ static int of_phy_match(struct device *dev, void *phy_np)
struct phy_device *of_phy_find_device(struct device_node *phy_np)
{
struct device *d;
struct mdio_device *mdiodev;
if (!phy_np)
return NULL;
d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
return d ? to_phy_device(d) : NULL;
if (d) {
mdiodev = to_mdio_device(d);
if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
return to_phy_device(d);
}
return NULL;
}
EXPORT_SYMBOL(of_phy_find_device);