From: Jens Axboe <jens.axboe@oracle.com>
Date: Thu, 17 Sep 2009 12:51:44 +0000 (+0200)
Subject: nfs: nfs_kill_super() should call bdi_unregister() after killing super
X-Git-Tag: v2.6.32-rc1~617^2~3
X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=commitdiff_plain;h=92f25053c0189f8d2887f837d3936cdca1cdf730

nfs: nfs_kill_super() should call bdi_unregister() after killing super

Otherwise we could be attempting to flush data for a writeback
thread and bdi that have already disappeared.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index de93569..f1cc058 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2190,8 +2190,8 @@ static void nfs_kill_super(struct super_block *s)
 {
 	struct nfs_server *server = NFS_SB(s);
 
-	bdi_unregister(&server->backing_dev_info);
 	kill_anon_super(s);
+	bdi_unregister(&server->backing_dev_info);
 	nfs_fscache_release_super_cookie(s);
 	nfs_free_server(server);
 }