[patch 29/40] ide: Add ide_get_paired_drive() helper

Greg Kroah-Hartman
2007-11-15T07:05:14Z

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-stable review patch. If anyone has any objections, please let us know.

------------------
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>

patch 1b678347121001c3c230c6eccfdf9f65c3ec1a4e in mainline.

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>
Cc: Andrew Morton <akpm@osdl.org>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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

--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1437,4 +1437,11 @@ 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 */

--