linux-kernel - [PATCH] vfs: add missing unlock in sget()

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Message-ID: <499149C4.2040606@cn.fujitsu.com>
Date:	Tue, 10 Feb 2009 17:32:52 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] 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@...fujitsu.com>
---
 fs/super.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/fs/super.c b/fs/super.c
index 61dce00..f849485 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -356,8 +356,10 @@ retry:
 				continue;
 			if (!grab_super(old))
 				goto retry;
-			if (s)
+			if (s) {
+				up_write(&s->s_umount);
 				destroy_super(s);
+			}
 			return old;
 		}
 	}
@@ -372,6 +374,7 @@ retry:
 	err = set(s, data);
 	if (err) {
 		spin_unlock(&sb_lock);
+		up_write(&s->s_umount);
 		destroy_super(s);
 		return ERR_PTR(err);
 	}
-- 
1.5.4.rc3

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