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

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The driver doesn't support clause 45 register access yet, but doesn't
check if the access is a c45 one either. This leads to spurious register
reads and writes. Add the check.

Fixes: 542671fe4d ("net: phy: mscc-miim: Add MDIO driver")
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Walle 2022-04-05 14:02:33 +02:00 committed by David S. Miller
parent 9386d1811f
commit 8d90991e5b
1 changed files with 6 additions and 0 deletions
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6
drivers/net/mdio/mdio-mscc-miim.c
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@ -102,6 +102,9 @@ 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;
@ -145,6 +148,9 @@ 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;