Path: news.gmane.org!not-for-mail
From: Ian Kent <raven@themaw.net>
Newsgroups: gmane.linux.kernel
Subject: [PATCH] autofs4 - fix lockdep splat in autofs
Date: Mon, 22 Aug 2011 11:52:28 +0800
Lines: 35
Approved: news@gmane.org
Message-ID: <20110822035228.13189.62994.stgit@perseus.themaw.net>
NNTP-Posting-Host: lo.gmane.org
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
X-Trace: dough.gmane.org 1313985730 20409 80.91.229.12 (22 Aug 2011 04:02:10 GMT)
X-Complaints-To: usenet@dough.gmane.org
NNTP-Posting-Date: Mon, 22 Aug 2011 04:02:10 +0000 (UTC)
Cc: Kernel Mailing List <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
To: Al Viro <viro@ZenIV.linux.org.uk>
Original-X-From: linux-kernel-owner@vger.kernel.org Mon Aug 22 06:02:05 2011
Return-path: <linux-kernel-owner@vger.kernel.org>
Envelope-to: glk-linux-kernel-3@lo.gmane.org
Original-Received: from vger.kernel.org ([209.132.180.67])
by lo.gmane.org with esmtp (Exim 4.69)
(envelope-from <linux-kernel-owner@vger.kernel.org>)
id 1QvLi6-00059I-P9
for glk-linux-kernel-3@lo.gmane.org; Mon, 22 Aug 2011 06:02:03 +0200
Original-Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
id S1750951Ab1HVEBw (ORCPT <rfc822;glk-linux-kernel-3@m.gmane.org>);
Mon, 22 Aug 2011 00:01:52 -0400
Original-Received: from outbound.icp-qv1-irony-out2.iinet.net.au ([203.59.1.107]:23283
"EHLO outbound.icp-qv1-irony-out2.iinet.net.au" rhost-flags-OK-OK-OK-OK)
by vger.kernel.org with ESMTP id S1750806Ab1HVEBu (ORCPT
<rfc822;linux-kernel@vger.kernel.org>);
Mon, 22 Aug 2011 00:01:50 -0400
X-Greylist: delayed 554 seconds by postgrey-1.27 at vger.kernel.org; Mon, 22 Aug 2011 00:01:50 EDT
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: Av4EADDSUU7LO5kB/2dsb2JhbABBhEujSHeBQAEpBFIoCAUCGA4CSRYTrRSQOYEshAyBEASHXpBgi1k
X-IronPort-AV: E=Sophos;i="4.68,261,1312128000";
d="scan'208";a="765105065"
Original-Received: from unknown (HELO perseus.themaw.net) ([203.59.153.1])
by outbound.icp-qv1-irony-out2.iinet.net.au with ESMTP; 22 Aug 2011 11:52:32 +0800
User-Agent: StGIT/0.14.3
Original-Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Xref: news.gmane.org gmane.linux.kernel:1182197
Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1182197>
From: Steven Rostedt <rostedt@goodmis.org>
When recursing down the locks when traversing a tree/list in
get_next_positive_dentry() or get_next_positive_subdir() a lock can
change from being nested to being a parent which breaks lockdep. This
patch tells lockdep about what we did.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Ian Kent <raven@themaw.net>
---
fs/autofs4/expire.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index 450f529..1feb68e 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -124,6 +124,7 @@ start:
/* Negative dentry - try next */
if (!simple_positive(q)) {
spin_unlock(&p->d_lock);
+ lock_set_subclass(&q->d_lock.dep_map, 0, _RET_IP_);
p = q;
goto again;
}
@@ -186,6 +187,7 @@ again:
/* Negative dentry - try next */
if (!simple_positive(ret)) {
spin_unlock(&p->d_lock);
+ lock_set_subclass(&ret->d_lock.dep_map, 0, _RET_IP_);
p = ret;
goto again;
}