net: phy: improve get_phy_id

Only caller of get_phy_id() is get_phy_device(). There a PHY ID of
0xffffffff is translated back to -ENODEV. So we can avoid some
overhead by returning -ENODEV directly.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index ddb12f4..3860dd8 100644 (file)
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -773,15 +773,8 @@ static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id,
        /* Grab the bits from PHYIR1, and put them in the upper half */
        phy_reg = mdiobus_read(bus, addr, MII_PHYSID1);
        if (phy_reg < 0) {
-               /* if there is no device, return without an error so scanning
-                * the bus works properly
-                */
-               if (phy_reg == -EIO || phy_reg == -ENODEV) {
-                       *phy_id = 0xffffffff;
-                       return 0;
-               }
-
-               return -EIO;
+               /* returning -ENODEV doesn't stop bus scanning */
+               return (phy_reg == -EIO || phy_reg == -ENODEV) ? -ENODEV : -EIO;
        }
 
        *phy_id = (phy_reg & 0xffff) << 16;