From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932079AbdJSNxR (ORCPT ); Thu, 19 Oct 2017 09:53:17 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:48032 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754319AbdJSNxO (ORCPT ); Thu, 19 Oct 2017 09:53:14 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Coly Li , Shaohua Li , Sasha Levin Subject: [PATCH 4.4 31/46] md/linear: shutup lockdep warnning Date: Thu, 19 Oct 2017 15:49:07 +0200 Message-Id: <20171019134847.348495684@linuxfoundation.org> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171019134845.293630834@linuxfoundation.org> References: <20171019134845.293630834@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Shaohua Li [ Upstream commit d939cdfde34f50b95254b375f498447c82190b3e ] Commit 03a9e24(md linear: fix a race between linear_add() and linear_congested()) introduces the warnning. Acked-by: Coly Li Signed-off-by: Shaohua Li Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/md/linear.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -223,7 +223,8 @@ static int linear_add(struct mddev *mdde * oldconf until no one uses it anymore. */ mddev_suspend(mddev); - oldconf = rcu_dereference(mddev->private); + oldconf = rcu_dereference_protected(mddev->private, + lockdep_is_held(&mddev->reconfig_mutex)); mddev->raid_disks++; WARN_ONCE(mddev->raid_disks != newconf->raid_disks, "copied raid_disks doesn't match mddev->raid_disks");