PCI: fix undefined reference to 'pci_fixup_final_inited'

My "PCI: Integrate 'pci_fixup_final' quirks into hot-plug paths" patch
introduced an undefined reference to 'pci_fixup_final_inited' when
CONFIG_PCI_QUIRKS is not enabled (on x86_64):
  drivers/built-in.o: In function `pci_bus_add_device':
  (.text+0x4f62): undefined reference to `pci_fixup_final_inited'

This patch removes the external reference ending up with a result closer
to what we ultimately want when the boot path issues described in the
original patch are resolved.

References:
  https://lkml.org/lkml/2012/7/9/542    Original, offending, patch
  https://lkml.org/lkml/2012/7/12/338	Randy's catch

Reported-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>

drivers/pci/bus.c

@@ -164,10 +164,8 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
 int pci_bus_add_device(struct pci_dev *dev)
 {
 	int retval;
-	extern bool pci_fixup_final_inited;
 
-	if (pci_fixup_final_inited)
-		pci_fixup_device(pci_fixup_final, dev);
+	pci_fixup_device(pci_fixup_final, dev);
 	retval = device_add(&dev->dev);
 	if (retval)
 		return retval;

drivers/pci/quirks.c

@@ -2979,6 +2979,7 @@ extern struct pci_fixup __end_pci_fixups_resume_early[];
 extern struct pci_fixup __start_pci_fixups_suspend[];
 extern struct pci_fixup __end_pci_fixups_suspend[];
 
+static bool pci_apply_fixup_final_quirks;
 
 void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev)
 {
@@ -2996,6 +2997,8 @@ void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev)
 		break;
 
 	case pci_fixup_final:
+		if (!pci_apply_fixup_final_quirks)
+			return;
 		start = __start_pci_fixups_final;
 		end = __end_pci_fixups_final;
 		break;
@@ -3029,21 +3032,6 @@ void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev)
 EXPORT_SYMBOL(pci_fixup_device);
 
 
-/*
- * The global variable 'pci_fixup_final_inited' is being used as a interim
- * solution for calling the final quirks only during hot-plug events (not
- * during boot processing).
- *
- * When the boot path's PCI device setup sequencing is addressed, we can
- * remove the instance, and usages of, 'pci_fixup_final_inited' along with
- * removing 'fs_initcall_sync(pci_apply_final_quirks);' and end up with a
- * single, uniform, solution that satisfies both the boot path and the
- * various hot-plug event paths.
- *
- * ToDo: Remove 'pci_fixup_final_inited'
- */
-bool pci_fixup_final_inited;
-
 static int __init pci_apply_final_quirks(void)
 {
 	struct pci_dev *dev = NULL;
@@ -3054,6 +3042,7 @@ static int __init pci_apply_final_quirks(void)
 		printk(KERN_DEBUG "PCI: CLS %u bytes\n",
 		       pci_cache_line_size << 2);
 
+	pci_apply_fixup_final_quirks = true;
 	for_each_pci_dev(dev) {
 		pci_fixup_device(pci_fixup_final, dev);
 		/*
@@ -3074,7 +3063,6 @@ static int __init pci_apply_final_quirks(void)
 			pci_cache_line_size = pci_dfl_cache_line_size;
 		}
 	}
-	pci_fixup_final_inited = 1;
 
 	if (!pci_cache_line_size) {
 		printk(KERN_DEBUG "PCI: CLS %u bytes, default %u\n",