Index: linux/drivers/acpi/pci_root.c
===================================================================
--- linux.orig/drivers/acpi/pci_root.c	2012-07-04 09:54:52.061486507 +0900
+++ linux/drivers/acpi/pci_root.c	2012-07-04 09:55:45.697815965 +0900
@@ -72,8 +72,8 @@ static struct acpi_driver acpi_pci_root_
 };
 
 static LIST_HEAD(acpi_pci_roots);
+static LIST_HEAD(acpi_pci_drivers);
 
-static struct acpi_pci_driver *sub_driver;
 static DEFINE_MUTEX(osc_lock);
 
 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
@@ -81,10 +81,7 @@ int acpi_pci_register_driver(struct acpi
 	int n = 0;
 	struct acpi_pci_root *root;
 
-	struct acpi_pci_driver **pptr = &sub_driver;
-	while (*pptr)
-		pptr = &(*pptr)->next;
-	*pptr = driver;
+	list_add_tail(&driver->node, &acpi_pci_drivers);
 
 	if (!driver->add)
 		return 0;
@@ -103,14 +100,7 @@ void acpi_pci_unregister_driver(struct a
 {
 	struct acpi_pci_root *root;
 
-	struct acpi_pci_driver **pptr = &sub_driver;
-	while (*pptr) {
-		if (*pptr == driver)
-			break;
-		pptr = &(*pptr)->next;
-	}
-	BUG_ON(!*pptr);
-	*pptr = (*pptr)->next;
+	list_del(&driver->node);
 
 	if (!driver->remove)
 		return;
Index: linux/include/linux/acpi.h
===================================================================
--- linux.orig/include/linux/acpi.h	2012-07-04 09:54:52.061486507 +0900
+++ linux/include/linux/acpi.h	2012-07-04 09:55:45.697815965 +0900
@@ -138,7 +138,7 @@ void acpi_penalize_isa_irq(int irq, int 
 void acpi_pci_irq_disable (struct pci_dev *dev);
 
 struct acpi_pci_driver {
-	struct acpi_pci_driver *next;
+	struct list_head node;
 	int (*add)(acpi_handle handle);
 	void (*remove)(acpi_handle handle);
 };