From: Li Zefan <lizf@cn.fujitsu.com>
Date: Thu, 12 Mar 2009 21:31:29 +0000 (-0700)
Subject: vfs: add missing unlock in sget()
X-Git-Tag: v2.6.29-rc8~16
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=a3cfbb53b1764a3d1f58ddc032737ab9edaa7d41;p=people%2Fssmith%2Fnetchannel2-pvops.bak.git%2F.git

vfs: add missing unlock in sget()

In sget(), destroy_super(s) is called with s->s_umount held, which makes
lockdep unhappy.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/super.c b/fs/super.c
index 8349ed6b141..6ce501447ad 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -371,8 +371,10 @@ retry:
 				continue;
 			if (!grab_super(old))
 				goto retry;
-			if (s)
+			if (s) {
+				up_write(&s->s_umount);
 				destroy_super(s);
+			}
 			return old;
 		}
 	}
@@ -387,6 +389,7 @@ retry:
 	err = set(s, data);
 	if (err) {
 		spin_unlock(&sb_lock);
+		up_write(&s->s_umount);
 		destroy_super(s);
 		return ERR_PTR(err);
 	}