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net: mdio: C22 is now optional, EOPNOTSUPP if not provided

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When performing a C22 operation, check that the bus driver actually
provides the methods, and return -EOPNOTSUPP if not. C45 only busses
do exist, and in future their C22 methods will be NULL.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Andrew Lunn 2023-01-09 16:30:44 +01:00 committed by Jakub Kicinski
parent 555d64c6d8
commit b063b1924f
1 changed files with 8 additions and 2 deletions
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10
drivers/net/phy/mdio_bus.c
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@ -766,7 +766,10 @@ int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
lockdep_assert_held_once(&bus->mdio_lock);
retval = bus->read(bus, addr, regnum);
if (bus->read)
retval = bus->read(bus, addr, regnum);
else
retval = -EOPNOTSUPP;
trace_mdio_access(bus, 1, addr, regnum, retval, retval);
mdiobus_stats_acct(&bus->stats[addr], true, retval);
@ -792,7 +795,10 @@ int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
lockdep_assert_held_once(&bus->mdio_lock);
err = bus->write(bus, addr, regnum, val);
if (bus->write)
err = bus->write(bus, addr, regnum, val);
else
err = -EOPNOTSUPP;
trace_mdio_access(bus, 0, addr, regnum, val, err);
mdiobus_stats_acct(&bus->stats[addr], false, err);