Revert "sky2: remove check for PCI wakeup setting from BIOS"

This reverts commit 84cd2dfb.

Some BIOS's break if Wake On Lan is enabled, and the machine
can't boot. Better to have some user's have to call ethtool to
enable WOL than to break a single user's boot.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/sky2.c

@@ -3949,7 +3949,7 @@ static __exit void sky2_debug_cleanup(void)
 /* Initialize network device */
 static __devinit struct net_device *sky2_init_netdev(struct sky2_hw *hw,
 						     unsigned port,
-						     int highmem)
+						     int highmem, int wol)
 {
 	struct sky2_port *sky2;
 	struct net_device *dev = alloc_etherdev(sizeof(*sky2));
@@ -3989,7 +3989,7 @@ static __devinit struct net_device *sky2_init_netdev(struct sky2_hw *hw,
 	sky2->speed = -1;
 	sky2->advertising = sky2_supported_modes(hw);
 	sky2->rx_csum = (hw->chip_id != CHIP_ID_YUKON_XL);
-	sky2->wol = sky2_wol_supported(hw) & WAKE_MAGIC;
+	sky2->wol = wol;
 
 	spin_lock_init(&sky2->phy_lock);
 	sky2->tx_pending = TX_DEF_PENDING;
@@ -4086,12 +4086,24 @@ static int __devinit sky2_test_msi(struct sky2_hw *hw)
 	return err;
 }
 
+static int __devinit pci_wake_enabled(struct pci_dev *dev)
+{
+	int pm  = pci_find_capability(dev, PCI_CAP_ID_PM);
+	u16 value;
+
+	if (!pm)
+		return 0;
+	if (pci_read_config_word(dev, pm + PCI_PM_CTRL, &value))
+		return 0;
+	return value & PCI_PM_CTRL_PME_ENABLE;
+}
+
 static int __devinit sky2_probe(struct pci_dev *pdev,
 				const struct pci_device_id *ent)
 {
 	struct net_device *dev;
 	struct sky2_hw *hw;
-	int err, using_dac = 0;
+	int err, using_dac = 0, wol_default;
 
 	err = pci_enable_device(pdev);
 	if (err) {
@@ -4124,6 +4136,8 @@ static int __devinit sky2_probe(struct pci_dev *pdev,
 		}
 	}
 
+	wol_default = pci_wake_enabled(pdev) ? WAKE_MAGIC : 0;
+
 	err = -ENOMEM;
 	hw = kzalloc(sizeof(*hw), GFP_KERNEL);
 	if (!hw) {
@@ -4167,7 +4181,7 @@ static int __devinit sky2_probe(struct pci_dev *pdev,
 
 	sky2_reset(hw);
 
-	dev = sky2_init_netdev(hw, 0, using_dac);
+	dev = sky2_init_netdev(hw, 0, using_dac, wol_default);
 	if (!dev) {
 		err = -ENOMEM;
 		goto err_out_free_pci;
@@ -4204,7 +4218,7 @@ static int __devinit sky2_probe(struct pci_dev *pdev,
 	if (hw->ports > 1) {
 		struct net_device *dev1;
 
-		dev1 = sky2_init_netdev(hw, 1, using_dac);
+		dev1 = sky2_init_netdev(hw, 1, using_dac, wol_default);
 		if (!dev1)
 			dev_warn(&pdev->dev, "allocation for second device failed\n");
 		else if ((err = register_netdev(dev1))) {