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

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From: Benjamin Herrenschmidt <benh@...>
To: Bartlomiej Zolnierkiewicz <bzolnier@...>
Cc: Linux IDE <linux-ide@...>, <linux-kernel@...>, Andrew Morton <akpm@...>
Subject: [PATCH 1/3] ide: Add ide_get_paired_drive() helper
Date: Wednesday, October 17, 2007 - 8:56 pm

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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Messages in current thread:
[PATCH 0/3] ide: Fix use of paired device, Benjamin Herrenschmidt, (Wed Oct 17, 8:56 pm)
Re: [PATCH 0/3] ide: Fix use of paired device, Bartlomiej Zolnierkiewicz..., (Thu Oct 18, 4:29 pm)
Re: [PATCH 0/3] ide: Fix use of paired device, Sergei Shtylyov, (Thu Oct 18, 7:54 am)
Re: [PATCH 0/3] ide: Fix use of paired device, Benjamin Herrenschmidt, (Thu Oct 18, 8:14 am)
Re: [PATCH 0/3] ide: Fix use of paired device, Sergei Shtylyov, (Thu Oct 18, 7:58 am)
[PATCH 3/3] ide: Fix cs5535 driver accessing beyond array bo..., Benjamin Herrenschmidt, (Wed Oct 17, 8:56 pm)
Re: [PATCH 3/3] ide: Fix cs5535 driver accessing beyond arra..., Bartlomiej Zolnierkiewicz..., (Thu Oct 18, 5:10 pm)
Re: [PATCH 3/3] ide: Fix cs5535 driver accessing beyond arra..., Sergei Shtylyov, (Thu Oct 18, 8:03 am)
[PATCH 2/3] ide: Fix siimage driver accessing beyond array b..., Benjamin Herrenschmidt, (Wed Oct 17, 8:56 pm)
Re: [PATCH 2/3] ide: Fix siimage driver accessing beyond arr..., Bartlomiej Zolnierkiewicz..., (Thu Oct 18, 5:10 pm)
Re: [PATCH 2/3] ide: Fix siimage driver accessing beyond arr..., Sergei Shtylyov, (Thu Oct 18, 8:02 am)
Re: [PATCH 2/3] ide: Fix siimage driver accessing beyond arr..., Benjamin Herrenschmidt, (Thu Oct 18, 8:16 am)
Re: [PATCH 2/3] ide: Fix siimage driver accessing beyond arr..., Bartlomiej Zolnierkiewicz..., (Thu Oct 18, 5:30 pm)
[PATCH 1/3] ide: Add ide_get_paired_drive() helper, Benjamin Herrenschmidt, (Wed Oct 17, 8:56 pm)
Re: [PATCH 1/3] ide: Add ide_get_paired_drive() helper, Bartlomiej Zolnierkiewicz..., (Thu Oct 18, 5:10 pm)
Re: [PATCH 1/3] ide: Add ide_get_paired_drive() helper, Sergei Shtylyov, (Thu Oct 18, 8:00 am)