[PATCH] Prevent IDE boot ops on NUMA system in mainline

[Andi Kleen <andi@firstfloor.org>]

Without this patch a Opteron test system here oopses at boot with currentg git. 

Calling to_pci_dev() on a NULL pointer gives a negative value so the following NULL 
pointer check never triggers and then an illegal address is referenced. Check the 
unadjusted original device pointer for NULL instead.

Signed-off-by: Andi Kleen <ak@suse.de>

Index: linux/include/linux/ide.h
===================================================================
--- linux.orig/include/linux/ide.h
+++ linux/include/linux/ide.h
@@ -1294,7 +1294,7 @@ static inline void ide_dump_identify(u8 
 static inline int hwif_to_node(ide_hwif_t *hwif)
 {
 	struct pci_dev *dev = to_pci_dev(hwif->dev);
-	return dev ? pcibus_to_node(dev->bus) : -1;
+	return hwif->dev ? pcibus_to_node(dev->bus) : -1;
 }
 
 static inline ide_drive_t *ide_get_paired_drive(ide_drive_t *drive)