[PATCH 1/3] ide: Add ide_get_paired_drive() helper

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

This adds a helper to get to the "other" drive on a pair connected
to a given hwif.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

Note: You may want to use the 1 - select.b.unit construct instead,
as you prefer, I just used what was there and fixed it.

 include/linux/ide.h |    7 +++++++
 1 file changed, 7 insertions(+)

Index: linux-work/include/linux/ide.h
===================================================================
--- linux-work.orig/include/linux/ide.h	2007-10-18 10:41:42.000000000 +1000
+++ linux-work/include/linux/ide.h	2007-10-18 10:42:40.000000000 +1000
@@ -1454,4 +1454,11 @@ static inline int hwif_to_node(ide_hwif_
 	return dev ? pcibus_to_node(dev->bus) : -1;
 }
 
+static inline ide_drive_t *ide_get_paired_drive(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif	= HWIF(drive);
+
+	return &hwif->drives[(drive->dn ^ 1) & 1];
+}
+
 #endif /* _IDE_H */
-
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