[ACPI] S3 Suspend to RAM: interrupt resume fix

Delete PCI Interrupt Link Device .resume method --
it is the device driver's job to request interrupts,
not the Link's job to remember what the devices want.

This addresses the issue of attempting to run
the ACPI interpreter too early in resume, when
interrupts are still disabled.

http://bugzilla.kernel.org/show_bug.cgi?id=3469

Signed-off-by: David Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/pci_link.c

@@ -72,10 +72,12 @@ struct acpi_pci_link_irq {
 	u8			active;			/* Current IRQ */
 	u8			edge_level;		/* All IRQs */
 	u8			active_high_low;	/* All IRQs */
-	u8			initialized;
 	u8			resource_type;
 	u8			possible_count;
 	u8			possible[ACPI_PCI_LINK_MAX_POSSIBLE];
+	u8			initialized:1;
+	u8			suspend_resume:1;
+	u8			reserved:6;
 };
 
 struct acpi_pci_link {
@@ -530,6 +532,10 @@ static int acpi_pci_link_allocate(
 
 	ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
 
+	if (link->irq.suspend_resume) {
+		acpi_pci_link_set(link, link->irq.active);
+		link->irq.suspend_resume = 0;
+	}
 	if (link->irq.initialized)
 		return_VALUE(0);
 
@@ -713,38 +719,24 @@ acpi_pci_link_add (
 	return_VALUE(result);
 }
 
-
-static int
-acpi_pci_link_resume (
-	struct acpi_pci_link	*link)
-{
-	ACPI_FUNCTION_TRACE("acpi_pci_link_resume");
-
-	if (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)
+irqrouter_suspend(
+	struct sys_device *dev,
+	u32	state)
 {
 	struct list_head        *node = NULL;
 	struct acpi_pci_link    *link = NULL;
 
-	ACPI_FUNCTION_TRACE("irqrouter_resume");
+	ACPI_FUNCTION_TRACE("irqrouter_suspend");
 
 	list_for_each(node, &acpi_link.entries) {
-
 		link = list_entry(node, struct acpi_pci_link, node);
 		if (!link) {
 			ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
 			continue;
 		}
-
-		acpi_pci_link_resume(link);
+		if (link->irq.active && link->irq.initialized)
+			link->irq.suspend_resume = 1;
 	}
 	return_VALUE(0);
 }
@@ -856,7 +848,7 @@ __setup("acpi_irq_balance", acpi_irq_balance_set);
 
 static struct sysdev_class irqrouter_sysdev_class = {
         set_kset_name("irqrouter"),
-        .resume = irqrouter_resume,
+        .suspend = irqrouter_suspend,
 };