net: phy: mscc-miim: reject clause 45 register accesses

[platform/kernel/linux-rpi.git] / drivers / net / mdio / mdio-mscc-miim.c

diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c
index 17f98f6..5070ca2 100644 (file)
--- a/drivers/net/mdio/mdio-mscc-miim.c
+++ b/drivers/net/mdio/mdio-mscc-miim.c
@@ -76,6 +76,9 @@ static int mscc_miim_read(struct mii_bus *bus, int mii_id, int regnum)
        u32 val;
        int ret;
 
+       if (regnum & MII_ADDR_C45)
+               return -EOPNOTSUPP;
+
        ret = mscc_miim_wait_pending(bus);
        if (ret)
                goto out;
@@ -105,6 +108,9 @@ static int mscc_miim_write(struct mii_bus *bus, int mii_id,
        struct mscc_miim_dev *miim = bus->priv;
        int ret;
 
+       if (regnum & MII_ADDR_C45)
+               return -EOPNOTSUPP;
+
        ret = mscc_miim_wait_pending(bus);
        if (ret < 0)
                goto out;