From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Wed, 16 Jan 2019 18:52:51 +0000 (+0100)
Subject: net: phy: improve get_phy_id
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=d8cce3a1bc539f7e928eb1d094a312089b146aa4;p=openwrt%2Fstaging%2Fblogic.git

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 ddb12f420940..3860dd85d097 100644
--- 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;