r8169: simplify and improve check for dash

r8168_check_dash() returns false anyway for all chip versions not
supporting dash. So we can simplify the check conditions.

In addition change the check functions to return bool instead of int,
because they actually return a bool value.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/r8169.c

@@ -1472,19 +1472,19 @@ static void rtl8168_driver_stop(struct rtl8169_private *tp)
 	}
 }
 
-static int r8168dp_check_dash(struct rtl8169_private *tp)
+static bool r8168dp_check_dash(struct rtl8169_private *tp)
 {
 	u16 reg = rtl8168_get_ocp_reg(tp);
 
-	return (ocp_read(tp, 0x0f, reg) & 0x00008000) ? 1 : 0;
+	return !!(ocp_read(tp, 0x0f, reg) & 0x00008000);
 }
 
-static int r8168ep_check_dash(struct rtl8169_private *tp)
+static bool r8168ep_check_dash(struct rtl8169_private *tp)
 {
-	return (ocp_read(tp, 0x0f, 0x128) & 0x00000001) ? 1 : 0;
+	return !!(ocp_read(tp, 0x0f, 0x128) & 0x00000001);
 }
 
-static int r8168_check_dash(struct rtl8169_private *tp)
+static bool r8168_check_dash(struct rtl8169_private *tp)
 {
 	switch (tp->mac_version) {
 	case RTL_GIGA_MAC_VER_27:
@@ -1496,7 +1496,7 @@ static int r8168_check_dash(struct rtl8169_private *tp)
 	case RTL_GIGA_MAC_VER_51:
 		return r8168ep_check_dash(tp);
 	default:
-		return 0;
+		return false;
 	}
 }
 
@@ -4982,15 +4982,8 @@ static void r8168_pll_power_down(struct rtl8169_private *tp)
 {
 	void __iomem *ioaddr = tp->mmio_addr;
 
-	if ((tp->mac_version == RTL_GIGA_MAC_VER_27 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_28 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_31 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_49 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_50 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_51) &&
-	    r8168_check_dash(tp)) {
+	if (r8168_check_dash(tp))
 		return;
-	}
 
 	if ((tp->mac_version == RTL_GIGA_MAC_VER_23 ||
 	     tp->mac_version == RTL_GIGA_MAC_VER_24) &&
@@ -8202,15 +8195,8 @@ static void rtl_remove_one(struct pci_dev *pdev)
 	struct net_device *dev = pci_get_drvdata(pdev);
 	struct rtl8169_private *tp = netdev_priv(dev);
 
-	if ((tp->mac_version == RTL_GIGA_MAC_VER_27 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_28 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_31 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_49 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_50 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_51) &&
-	    r8168_check_dash(tp)) {
+	if (r8168_check_dash(tp))
 		rtl8168_driver_stop(tp);
-	}
 
 	netif_napi_del(&tp->napi);
 
@@ -8640,15 +8626,8 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 			   rtl_chip_infos[chipset].jumbo_tx_csum ? "ok" : "ko");
 	}
 
-	if ((tp->mac_version == RTL_GIGA_MAC_VER_27 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_28 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_31 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_49 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_50 ||
-	     tp->mac_version == RTL_GIGA_MAC_VER_51) &&
-	    r8168_check_dash(tp)) {
+	if (r8168_check_dash(tp))
 		rtl8168_driver_start(tp);
-	}
 
 	netif_carrier_off(dev);