linux-kernel - [PATCH 08/16] blkfront: Fix backtrace in del

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Message-Id: <b244c1b3d8e0febf375946e2acf7a893528f4255.1279658433.git.jeremy.fitzhardinge@citrix.com>
Date:	Tue, 20 Jul 2010 13:42:16 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Xen-devel <xen-devel@...ts.xensource.com>,
	Daniel Stodden <daniel.stodden@...rix.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 08/16] blkfront: Fix backtrace in del_gendisk

From: Daniel Stodden <daniel.stodden@...rix.com>

The call to del_gendisk follows an non-refcounted gd->queue
pointer. We release the last ref in blk_cleanup_queue. Fixed by
reordering releases accordingly.

Signed-off-by: Daniel Stodden <daniel.stodden@...rix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 drivers/block/xen-blkfront.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 50b2952..62eba76 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1021,14 +1021,14 @@ static void blkfront_closing(struct blkfront_info *info)
 	/* Flush gnttab callback work. Must be done with no locks held. */
 	flush_scheduled_work();
 
-	blk_cleanup_queue(info->rq);
-	info->rq = NULL;
-
 	minor = info->gd->first_minor;
 	nr_minors = info->gd->minors;
 	del_gendisk(info->gd);
 	xlbd_release_minors(minor, nr_minors);
 
+	blk_cleanup_queue(info->rq);
+	info->rq = NULL;
+
  out:
 	if (info->xbdev)
 		xenbus_frontend_closed(info->xbdev);
-- 
1.7.1.1

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