Commit 70e927b9 authored by Marek Vasut's avatar Marek Vasut Committed by David S. Miller

mdio_bus: Fix MDIO bus scanning in __mdiobus_register()

Since commit b74766a0 ("phylib: don't return NULL
from get_phy_device()") in linux-next, phy_get_device() will return
ERR_PTR(-ENODEV) instead of NULL if the PHY device ID is all ones.

This causes problem with stmmac driver and likely some other drivers
which call mdiobus_register(). I triggered this bug on SoCFPGA MCVEVK
board with linux-next 20160427 and 20160428. In case of the stmmac, if
there is no PHY node specified in the DT for the stmmac block, the stmmac
driver ( drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c function
stmmac_mdio_register() ) will call mdiobus_register() , which will
register the MDIO bus and probe for the PHY.

The mdiobus_register() resp. __mdiobus_register() iterates over all of
the addresses on the MDIO bus and calls mdiobus_scan() for each of them,
which invokes get_phy_device(). Before the aforementioned patch, the
mdiobus_scan() would return NULL if no PHY was found on a given address
and mdiobus_register() would continue and try the next PHY address. Now,
mdiobus_scan() returns ERR_PTR(-ENODEV), which is caught by the
'if (IS_ERR(phydev))' condition and the loop exits immediately if the
PHY address does not contain PHY.

Repair this by explicitly checking for the ERR_PTR(-ENODEV) and if this
error comes around, continue with the next PHY address.
Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent def22c47
...@@ -333,7 +333,7 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner) ...@@ -333,7 +333,7 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner)
struct phy_device *phydev; struct phy_device *phydev;
phydev = mdiobus_scan(bus, i); phydev = mdiobus_scan(bus, i);
if (IS_ERR(phydev)) { if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) {
err = PTR_ERR(phydev); err = PTR_ERR(phydev);
goto error; goto error;
} }
......
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