of: mdio: Fix a signedness bug in of_phy_get_and_connect()

[ Upstream commit d7eb651212fdbafa82d485d8e76095ac3b14c193 ]

The "iface" variable is an enum and in this context GCC treats it as
an unsigned int so the error handling is never triggered.

Fixes: b78624125304 ("of_mdio: Abstract a general interface for phy connect")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 5ad1342..7d2bc22 100644 (file)
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -370,7 +370,7 @@ struct phy_device *of_phy_get_and_connect(struct net_device *dev,
        int ret;
 
        iface = of_get_phy_mode(np);
-       if (iface < 0)
+       if ((int)iface < 0)
                return NULL;
        if (of_phy_is_fixed_link(np)) {
                ret = of_phy_register_fixed_link(np);