[PATCH] forcedeth: power management support

Tobias Diedrich <ranma@tdiedrich.de> sayeth:

Vanilla forcedeth doesn't seem to support suspend and an ifdown/up-cycle is
needed to get it working again after suspend.  Francois Romieu's "Awfully
experimental" patch is working just fine for me (with message signalled
interrupts disabled) and has survived quite a few suspend/resume cycles.

So I'd very much like to see (at least partial, with msi disabled)
suspend support for forcedeth in mainline.

(Addresses http://bugzilla.kernel.org/show_bug.cgi?id=6398)

Cc: Francois Romieu <romieu@fr.zoreil.com>
Cc; Jeff Garzik <jeff@garzik.org>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Ayaz Abdulla <aabdulla@nvidia.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/forcedeth.c

@@ -4603,6 +4603,50 @@ static void __devexit nv_remove(struct pci_dev *pci_dev)
 	pci_set_drvdata(pci_dev, NULL);
 }
 
+#ifdef CONFIG_PM
+static int nv_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct fe_priv *np = netdev_priv(dev);
+
+	if (!netif_running(dev))
+		goto out;
+
+	netif_device_detach(dev);
+
+	// Gross.
+	nv_close(dev);
+
+	pci_save_state(pdev);
+	pci_enable_wake(pdev, pci_choose_state(pdev, state), np->wolenabled);
+	pci_set_power_state(pdev, pci_choose_state(pdev, state));
+out:
+	return 0;
+}
+
+static int nv_resume(struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	int rc = 0;
+
+	if (!netif_running(dev))
+		goto out;
+
+	netif_device_attach(dev);
+
+	pci_set_power_state(pdev, PCI_D0);
+	pci_restore_state(pdev);
+	pci_enable_wake(pdev, PCI_D0, 0);
+
+	rc = nv_open(dev);
+out:
+	return rc;
+}
+#else
+#define nv_suspend NULL
+#define nv_resume NULL
+#endif /* CONFIG_PM */
+
 static struct pci_device_id pci_tbl[] = {
 	{	/* nForce Ethernet Controller */
 		PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_1),
@@ -4704,9 +4748,10 @@ static struct pci_driver driver = {
 	.id_table = pci_tbl,
 	.probe = nv_probe,
 	.remove = __devexit_p(nv_remove),
+	.suspend = nv_suspend,
+	.resume	= nv_resume,
 };
 
-
 static int __init init_nic(void)
 {
 	printk(KERN_INFO "forcedeth.c: Reverse Engineered nForce ethernet driver. Version %s.\n", FORCEDETH_VERSION);