net: asix: remove code duplicates in asix_mdio_read/write and asix_mdio_read/write_nopm

This functions are mostly same except of one hard coded "in_pm" variable.
So, rework them to reduce maintenance overhead.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/20220223110633.3006551-1-o.rempel@pengutronix.deSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/usb/asix_common.c

@@ -491,7 +491,8 @@ void asix_set_multicast(struct net_device *net)
 	asix_write_cmd_async(dev, AX_CMD_WRITE_RX_CTL, rx_ctl, 0, 0, NULL);
 }
 
-int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
+static int __asix_mdio_read(struct net_device *netdev, int phy_id, int loc,
+			    bool in_pm)
 {
 	struct usbnet *dev = netdev_priv(netdev);
 	__le16 res;
@@ -499,18 +500,18 @@ int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
 
 	mutex_lock(&dev->phy_mutex);
 
-	ret = asix_check_host_enable(dev, 0);
+	ret = asix_check_host_enable(dev, in_pm);
 	if (ret == -ENODEV || ret == -ETIMEDOUT) {
 		mutex_unlock(&dev->phy_mutex);
 		return ret;
 	}
 
 	ret = asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id, (__u16)loc, 2,
-			    &res, 0);
+			    &res, in_pm);
 	if (ret < 0)
 		goto out;
 
-	ret = asix_set_hw_mii(dev, 0);
+	ret = asix_set_hw_mii(dev, in_pm);
 out:
 	mutex_unlock(&dev->phy_mutex);
 
@@ -520,8 +521,13 @@ int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
 	return ret < 0 ? ret : le16_to_cpu(res);
 }
 
+int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
+{
+	return __asix_mdio_read(netdev, phy_id, loc, false);
+}
+
 static int __asix_mdio_write(struct net_device *netdev, int phy_id, int loc,
-			     int val)
+			     int val, bool in_pm)
 {
 	struct usbnet *dev = netdev_priv(netdev);
 	__le16 res = cpu_to_le16(val);
@@ -532,16 +538,16 @@ static int __asix_mdio_write(struct net_device *netdev, int phy_id, int loc,
 
 	mutex_lock(&dev->phy_mutex);
 
-	ret = asix_check_host_enable(dev, 0);
+	ret = asix_check_host_enable(dev, in_pm);
 	if (ret == -ENODEV)
 		goto out;
 
 	ret = asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2,
-			     &res, 0);
+			     &res, in_pm);
 	if (ret < 0)
 		goto out;
 
-	ret = asix_set_hw_mii(dev, 0);
+	ret = asix_set_hw_mii(dev, in_pm);
 out:
 	mutex_unlock(&dev->phy_mutex);
 
@@ -550,7 +556,7 @@ static int __asix_mdio_write(struct net_device *netdev, int phy_id, int loc,
 
 void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
 {
-	__asix_mdio_write(netdev, phy_id, loc, val);
+	__asix_mdio_write(netdev, phy_id, loc, val, false);
 }
 
 /* MDIO read and write wrappers for phylib */
@@ -558,67 +564,25 @@ int asix_mdio_bus_read(struct mii_bus *bus, int phy_id, int regnum)
 {
 	struct usbnet *priv = bus->priv;
 
-	return asix_mdio_read(priv->net, phy_id, regnum);
+	return __asix_mdio_read(priv->net, phy_id, regnum, false);
 }
 
 int asix_mdio_bus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
 {
 	struct usbnet *priv = bus->priv;
 
-	return __asix_mdio_write(priv->net, phy_id, regnum, val);
+	return __asix_mdio_write(priv->net, phy_id, regnum, val, false);
 }
 
 int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc)
 {
-	struct usbnet *dev = netdev_priv(netdev);
-	__le16 res;
-	int ret;
-
-	mutex_lock(&dev->phy_mutex);
-
-	ret = asix_check_host_enable(dev, 1);
-	if (ret == -ENODEV || ret == -ETIMEDOUT) {
-		mutex_unlock(&dev->phy_mutex);
-		return ret;
-	}
-
-	ret = asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
-			    (__u16)loc, 2, &res, 1);
-	if (ret < 0) {
-		mutex_unlock(&dev->phy_mutex);
-		return ret;
-	}
-	asix_set_hw_mii(dev, 1);
-	mutex_unlock(&dev->phy_mutex);
-
-	netdev_dbg(dev->net, "asix_mdio_read_nopm() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
-			phy_id, loc, le16_to_cpu(res));
-
-	return le16_to_cpu(res);
+	return __asix_mdio_read(netdev, phy_id, loc, true);
 }
 
 void
 asix_mdio_write_nopm(struct net_device *netdev, int phy_id, int loc, int val)
 {
-	struct usbnet *dev = netdev_priv(netdev);
-	__le16 res = cpu_to_le16(val);
-	int ret;
-
-	netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
-			phy_id, loc, val);
-
-	mutex_lock(&dev->phy_mutex);
-
-	ret = asix_check_host_enable(dev, 1);
-	if (ret == -ENODEV) {
-		mutex_unlock(&dev->phy_mutex);
-		return;
-	}
-
-	asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id,
-		       (__u16)loc, 2, &res, 1);
-	asix_set_hw_mii(dev, 1);
-	mutex_unlock(&dev->phy_mutex);
+	__asix_mdio_write(netdev, phy_id, loc, val, true);
 }
 
 void asix_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)