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net: dsa: mv88e6xxx: Unregister MDIO bus on error path 

The MDIO busses need to be unregistered before they are freed,
otherwise BUG() is called. Add a call to the unregister code if the
registration fails, since we can have multiple busses, of which some
may correctly register before one fails. This requires moving the code
around a little.

Fixes: a3c53be55c ("net: dsa: mv88e6xxx: Support multiple MDIO busses")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2017-12-07 01:05:57 +01:00 committed by David S. Miller
parent 3d5fdba184
commit 3126aeec53
1 changed files with 16 additions and 14 deletions
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30
drivers/net/dsa/mv88e6xxx/chip.c
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@ -2177,6 +2177,19 @@ static const struct of_device_id mv88e6xxx_mdio_external_match[] = {
{ },
};
static void mv88e6xxx_mdios_unregister(struct mv88e6xxx_chip *chip)
{
struct mv88e6xxx_mdio_bus *mdio_bus;
struct mii_bus *bus;
list_for_each_entry(mdio_bus, &chip->mdios, list) {
bus = mdio_bus->bus;
mdiobus_unregister(bus);
}
}
static int mv88e6xxx_mdios_register(struct mv88e6xxx_chip *chip,
struct device_node *np)
{
@ -2201,27 +2214,16 @@ static int mv88e6xxx_mdios_register(struct mv88e6xxx_chip *chip,
match = of_match_node(mv88e6xxx_mdio_external_match, child);
if (match) {
err = mv88e6xxx_mdio_register(chip, child, true);
if (err)
if (err) {
mv88e6xxx_mdios_unregister(chip);
return err;
}
}
}
return 0;
}
static void mv88e6xxx_mdios_unregister(struct mv88e6xxx_chip *chip)
{
struct mv88e6xxx_mdio_bus *mdio_bus;
struct mii_bus *bus;
list_for_each_entry(mdio_bus, &chip->mdios, list) {
bus = mdio_bus->bus;
mdiobus_unregister(bus);
}
}
static int mv88e6xxx_get_eeprom_len(struct dsa_switch *ds)
{
struct mv88e6xxx_chip *chip = ds->priv;