From: NeilBrown <neilb@suse.de>
Date: Thu, 25 Aug 2011 04:43:53 +0000 (+1000)
Subject: md/linear: avoid corrupting structure while waiting for rcu_free to complete.
X-Git-Tag: v2.6.32.47~98
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=372994e9fd5cadbacdfcc8724b590193d136c947;p=linux-pvops.git

md/linear: avoid corrupting structure while waiting for rcu_free to complete.

commit 1b6afa17581027218088a18a9ceda600e0ddba7a upstream.

I don't know what I was thinking putting 'rcu' after a dynamically
sized array!  The array could still be in use when we call rcu_free()
(That is the point) so we mustn't corrupt it.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/md/linear.h b/drivers/md/linear.h
index 0ce29b61605a..2f2da05b2ce9 100644
--- a/drivers/md/linear.h
+++ b/drivers/md/linear.h
@@ -10,9 +10,9 @@ typedef struct dev_info dev_info_t;
 
 struct linear_private_data
 {
+	struct rcu_head		rcu;
 	sector_t		array_sectors;
 	dev_info_t		disks[0];
-	struct rcu_head		rcu;
 };