r8169: remove rtl_wol_shutdown_quirk()

Since f658b909 ("r8169: fix DMA being used after buffer free if WoL is
enabled") it has been redundant to disable PCI bus mastering in
rtl_wol_shutdown_quirk(). And since 12006848 ("r8169: fix failing WoL")
CmdRxEnb is still enabled when we get here. So we can remove the function.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/2391ada0-eac5-ac43-f061-a7a44b0e7f33@gmail.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/realtek/r8169_main.c

@@ -4836,22 +4836,6 @@ static const struct dev_pm_ops rtl8169_pm_ops = {
 		       rtl8169_runtime_idle)
 };
 
-static void rtl_wol_shutdown_quirk(struct rtl8169_private *tp)
-{
-	/* WoL fails with 8168b when the receiver is disabled. */
-	switch (tp->mac_version) {
-	case RTL_GIGA_MAC_VER_11:
-	case RTL_GIGA_MAC_VER_17:
-		pci_clear_master(tp->pci_dev);
-
-		RTL_W8(tp, ChipCmd, CmdRxEnb);
-		rtl_pci_commit(tp);
-		break;
-	default:
-		break;
-	}
-}
-
 static void rtl_shutdown(struct pci_dev *pdev)
 {
 	struct rtl8169_private *tp = pci_get_drvdata(pdev);
@@ -4865,9 +4849,6 @@ static void rtl_shutdown(struct pci_dev *pdev)
 
 	if (system_state == SYSTEM_POWER_OFF &&
 	    tp->dash_type == RTL_DASH_NONE) {
-		if (tp->saved_wolopts)
-			rtl_wol_shutdown_quirk(tp);
-
 		pci_wake_from_d3(pdev, tp->saved_wolopts);
 		pci_set_power_state(pdev, PCI_D3hot);
 	}