natsemi: use generic power management

With legacy PM, drivers themselves were responsible for managing the
device's power states and takes care of register states.

After upgrading to the generic structure, PCI core will take care of
required tasks and drivers should do only device-specific operations.

Thus, there is no need to call the PCI helper functions like
pci_enable_device, which is not recommended. Hence, removed.

Compile-tested only.
Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/natsemi/natsemi.c

@@ -3247,8 +3247,6 @@ static void natsemi_remove1(struct pci_dev *pdev)
 	free_netdev (dev);
 }
 
-#ifdef CONFIG_PM
-
 /*
  * The ns83815 chip doesn't have explicit RxStop bits.
  * Kicking the Rx or Tx process for a new packet reenables the Rx process
@@ -3275,9 +3273,9 @@ static void natsemi_remove1(struct pci_dev *pdev)
  * Interrupts must be disabled, otherwise hands_off can cause irq storms.
  */
 
-static int natsemi_suspend (struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused natsemi_suspend(struct device *dev_d)
 {
-	struct net_device *dev = pci_get_drvdata (pdev);
+	struct net_device *dev = dev_get_drvdata(dev_d);
 	struct netdev_private *np = netdev_priv(dev);
 	void __iomem * ioaddr = ns_ioaddr(dev);
 
@@ -3326,11 +3324,10 @@ static int natsemi_suspend (struct pci_dev *pdev, pm_message_t state)
 }
 
 
-static int natsemi_resume (struct pci_dev *pdev)
+static int __maybe_unused natsemi_resume(struct device *dev_d)
 {
-	struct net_device *dev = pci_get_drvdata (pdev);
+	struct net_device *dev = dev_get_drvdata(dev_d);
 	struct netdev_private *np = netdev_priv(dev);
-	int ret = 0;
 
 	rtnl_lock();
 	if (netif_device_present(dev))
@@ -3339,12 +3336,6 @@ static int natsemi_resume (struct pci_dev *pdev)
 		const int irq = np->pci_dev->irq;
 
 		BUG_ON(!np->hands_off);
-		ret = pci_enable_device(pdev);
-		if (ret < 0) {
-			dev_err(&pdev->dev,
-				"pci_enable_device() failed: %d\n", ret);
-			goto out;
-		}
 	/*	pci_power_on(pdev); */
 
 		napi_enable(&np->napi);
@@ -3364,20 +3355,17 @@ static int natsemi_resume (struct pci_dev *pdev)
 	netif_device_attach(dev);
 out:
 	rtnl_unlock();
-	return ret;
+	return 0;
 }
 
-#endif /* CONFIG_PM */
+static SIMPLE_DEV_PM_OPS(natsemi_pm_ops, natsemi_suspend, natsemi_resume);
 
 static struct pci_driver natsemi_driver = {
 	.name		= DRV_NAME,
 	.id_table	= natsemi_pci_tbl,
 	.probe		= natsemi_probe1,
 	.remove		= natsemi_remove1,
-#ifdef CONFIG_PM
-	.suspend	= natsemi_suspend,
-	.resume		= natsemi_resume,
-#endif
+	.driver.pm	= &natsemi_pm_ops,
 };
 
 static int __init natsemi_init_mod (void)