Hello.
First of all, thank you for the patch!
You beat me to it (and not only me). :-)
On 4/29/2016 4:09 AM, Marek Vasut wrote:
Since commit b74766a0a0feeef5c779709cc5d109451c0d5b17 in linux-next,
( phylib: don't return NULL from get_phy_device() ), phy_get_device()
scripts/checkpatch.pl now enforces certain commit citing style, yours
doesn't quite match it.
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 immediatelly 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: Marek Vasut <ma...@denx.de>
Cc: Arnd Bergmann <a...@arndb.de>
Cc: David S. Miller <da...@davemloft.net>
Cc: Dinh Nguyen <dingu...@opensource.altera.com>
Cc: Florian Fainelli <f.faine...@gmail.com>
Cc: Sergei Shtylyov <sergei.shtyl...@cogentembedded.com>
Reviewed-by: Sergei Shtylyov <sergei.shtyl...@cogentembedded.com>
---
drivers/net/phy/mdio_bus.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
NOTE: I don't quite like this explicit check , but I don't have better idea now.
It's fine. I was going to do just the same :-)
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 499003ee..388f992 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -333,7 +333,7 @@ int __mdiobus_register(struct mii_bus *bus, struct module
*owner)
struct phy_device *phydev;
phydev = mdiobus_scan(bus, i);
- if (IS_ERR(phydev)) {
+ if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) {
Parens around the second operand of && are not really needed though...
[...]
MBR, Sergei
