net: PHYLIB mdio fixes #2
The PHYLIB mdio code has more problems in error paths:
- mdiobus_release can be called before bus->state is set to
MDIOBUS_REGISTERED
- mdiobus_scan allocates resources which need to be freed
- the comment is wrong, the resistors used are actually pull-ups.
Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 7a33360..11adf6e 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -63,7 +63,9 @@
static void mdiobus_release(struct device *d)
{
struct mii_bus *bus = to_mii_bus(d);
- BUG_ON(bus->state != MDIOBUS_RELEASED);
+ BUG_ON(bus->state != MDIOBUS_RELEASED &&
+ /* for compatibility with error handling in drivers */
+ bus->state != MDIOBUS_ALLOCATED);
kfree(bus);
}
@@ -83,8 +85,7 @@
*/
int mdiobus_register(struct mii_bus *bus)
{
- int i;
- int err = 0;
+ int i, err;
if (NULL == bus || NULL == bus->name ||
NULL == bus->read ||
@@ -116,16 +117,23 @@
struct phy_device *phydev;
phydev = mdiobus_scan(bus, i);
- if (IS_ERR(phydev))
+ if (IS_ERR(phydev)) {
err = PTR_ERR(phydev);
+ goto error;
+ }
}
}
- if (!err)
- bus->state = MDIOBUS_REGISTERED;
-
+ bus->state = MDIOBUS_REGISTERED;
pr_info("%s: probed\n", bus->name);
+ return 0;
+error:
+ while (--i >= 0) {
+ if (bus->phy_map[i])
+ device_unregister(&bus->phy_map[i]->dev);
+ }
+ device_del(&bus->dev);
return err;
}
EXPORT_SYMBOL(mdiobus_register);
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index f84f6a1b..e354601 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -232,7 +232,7 @@
return NULL;
/*
- * Broken hardware is sometimes missing the pull down resistor on the
+ * Broken hardware is sometimes missing the pull-up resistor on the
* MDIO line, which results in reads to non-existent devices returning
* 0 rather than 0xffff. Catch this here and treat 0 as a non-existent
* device as well.