stmmac: mdio register has to fail if the phy is not found

With this patch the stmmac fails in case of the phy device
is not found; w/o this fix the mdio can be register twice when
do down/up the iface and this is not correct.

Reported-by: Stas <stsp@list.ru>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index 0376a5e..0b9829f 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -188,8 +188,6 @@ int stmmac_mdio_register(struct net_device *ndev)
                goto bus_register_fail;
        }
 
-       priv->mii = new_bus;
-
        found = 0;
        for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
                struct phy_device *phydev = new_bus->phy_map[addr];
@@ -237,8 +235,14 @@ int stmmac_mdio_register(struct net_device *ndev)
                }
        }
 
-       if (!found)
+       if (!found) {
                pr_warning("%s: No PHY found\n", ndev->name);
+               mdiobus_unregister(new_bus);
+               mdiobus_free(new_bus);
+               return -ENODEV;
+       }
+
+       priv->mii = new_bus;
 
        return 0;