Revert ACPI interrupt resume changes

If there are devices that use interrupts over a suspend event, ACPI must
restore the PCI interrupt links on resume. Anything else breaks any
device that hasn't been converted to the new (dubious) PM rules.

Drivers that need the irq free/re-aquire sequence can be done one by one
independently of this one.

drivers/acpi/pci_link.c

···
 }
 
 static int
-irqrouter_suspend(
-	struct sys_device *dev,
-	u32	state)
+acpi_pci_link_resume(
+	struct acpi_pci_link *link)
+{
+	ACPI_FUNCTION_TRACE("acpi_pci_link_resume");
+
+	if (link->refcnt && link->irq.active && link->irq.initialized)
+		return_VALUE(acpi_pci_link_set(link, link->irq.active));
+	else
+		return_VALUE(0);
+}
+
+static int
+irqrouter_resume(
+	struct sys_device *dev)
 {
 	struct list_head        *node = NULL;
 	struct acpi_pci_link    *link = NULL;
-	int			ret = 0;
 
-	ACPI_FUNCTION_TRACE("irqrouter_suspend");
+	ACPI_FUNCTION_TRACE("irqrouter_resume");
 
 	list_for_each(node, &acpi_link.entries) {
 		link = list_entry(node, struct acpi_pci_link, node);
···
 				"Invalid link context\n"));
 			continue;
 		}
-		if (link->irq.initialized && link->refcnt != 0
-			/* We ignore legacy IDE device irq */
-			&& link->irq.active != 14 && link->irq.active !=15) {
-			printk(KERN_WARNING PREFIX
-				"%d drivers with interrupt %d neglected to call"
-				" pci_disable_device at .suspend\n",
-				link->refcnt,
-				link->irq.active);
-			printk(KERN_WARNING PREFIX
-				"Fix the driver, or rmmod before suspend\n");
-			link->refcnt = 0;
-			ret = -EINVAL;
-		}
+		acpi_pci_link_resume(link);
 	}
-	return_VALUE(ret);
+	return_VALUE(0);
 }
 
 
···
 /* FIXME: we will remove this interface after all drivers call pci_disable_device */
 static struct sysdev_class irqrouter_sysdev_class = {
         set_kset_name("irqrouter"),
-        .suspend = irqrouter_suspend,
+        .resume = irqrouter_resume,
 };