[PATCH] Fix ide-disk.c oops caused by hwif == NULL

1. Move hwif_to_node to ide.h

2. Use hwif_to_node in ide-disk.c
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/ide/ide-disk.c

@@ -1220,7 +1220,7 @@ static int ide_disk_probe(struct device *dev)
 		goto failed;
 
 	g = alloc_disk_node(1 << PARTN_BITS,
-			pcibus_to_node(drive->hwif->pci_dev->bus));
+			hwif_to_node(drive->hwif));
 	if (!g)
 		goto out_free_idkp;
 

drivers/ide/ide-probe.c

@@ -960,15 +960,6 @@ static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 }
 #endif /* MAX_HWIFS > 1 */
 
-static inline int hwif_to_node(ide_hwif_t *hwif)
-{
-	if (hwif->pci_dev)
-		return pcibus_to_node(hwif->pci_dev->bus);
-	else
-		/* Add ways to determine the node of other busses here */
-		return -1;
-}
-
 /*
  * init request queue
  */

include/linux/ide.h

@@ -1501,4 +1501,10 @@ extern struct bus_type ide_bus_type;
 #define ide_id_has_flush_cache_ext(id)	\
 	(((id)->cfs_enable_2 & 0x2400) == 0x2400)
 
+static inline int hwif_to_node(ide_hwif_t *hwif)
+{
+	struct pci_dev *dev = hwif->pci_dev;
+	return dev ? pcibus_to_node(dev->bus) : -1;
+}
+
 #endif /* _IDE_H */