linux-kernel - [PATCH] [152/275] md: correctly handle probe of an 'mdp' device.

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Message-Id: <20110330210633.B954E3E1A05@tassilo.jf.intel.com>
Date:	Wed, 30 Mar 2011 14:06:33 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	neilb@...e.de, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [152/275] md: correctly handle probe of an 'mdp' device.

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: NeilBrown <neilb@...e.de>

commit 8f5f02c460b7ca74ce55ce126ce0c1e58a3f923d upstream.

'mdp' devices are md devices with preallocated device numbers
for partitions. As such it is possible to mknod and open a partition
before opening the whole device.

this causes  md_probe() to be called with a device number of a
partition, which in-turn calls mddev_find with such a number.

However mddev_find expects the number of a 'whole device' and
does the wrong thing with partition numbers.

So add code to mddev_find to remove the 'partition' part of
a device number and just work with the 'whole device'.

This patch addresses https://bugzilla.kernel.org/show_bug.cgi?id=28652

Reported-by: hkmaly@...foot.com
Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/md/md.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6.35.y/drivers/md/md.c
===================================================================
--- linux-2.6.35.y.orig/drivers/md/md.c	2011-03-29 23:02:59.630309629 -0700
+++ linux-2.6.35.y/drivers/md/md.c	2011-03-29 23:53:36.584601568 -0700
@@ -441,6 +441,9 @@
 {
 	mddev_t *mddev, *new = NULL;
 
+	if (unit && MAJOR(unit) != MD_MAJOR)
+		unit &= ~((1<<MdpMinorShift)-1);
+
  retry:
 	spin_lock(&all_mddevs_lock);
 
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