| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.17 244/343] net: phy: mscc-miim: reject clause 45 register accesses | Date | Tue, 12 Apr 2022 08:31:02 +0200 |
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From: Michael Walle <michael@walle.cc>
[ Upstream commit 8d90991e5bf7fdb9f264f5f579d18969913054b7 ]
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: 542671fe4d86 ("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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/net/mdio/mdio-mscc-miim.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c index 64fb76c1e395..08381038810d 100644 --- a/drivers/net/mdio/mdio-mscc-miim.c +++ b/drivers/net/mdio/mdio-mscc-miim.c @@ -93,6 +93,9 @@ 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; @@ -136,6 +139,9 @@ 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; -- 2.35.1
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