From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932630AbdJKBLQ (ORCPT ); Tue, 10 Oct 2017 21:11:16 -0400 Received: from omzsmtpe03.verizonbusiness.com ([199.249.25.208]:28473 "EHLO omzsmtpe03.verizonbusiness.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756769AbdJKApw (ORCPT ); Tue, 10 Oct 2017 20:45:52 -0400 From: "Levin, Alexander (Sasha Levin)" X-Host: mariner.tdc.vzwcorp.com To: "gregkh@linuxfoundation.org" CC: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" Subject: [GIT PULL for-4.9 18/48] md/linear: shutup lockdep warnning Thread-Topic: [GIT PULL for-4.9 18/48] md/linear: shutup lockdep warnning Thread-Index: AQHTQio4yVYYzWLebkW3OFfk+R+hkw== Date: Wed, 11 Oct 2017 00:45:23 +0000 Message-ID: <20171011004512.7949-19-alexander.levin@verizon.com> References: <20171011004512.7949-1-alexander.levin@verizon.com> In-Reply-To: <20171011004512.7949-1-alexander.levin@verizon.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.144.60.250] Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by nfs id v9B1BNnb030788 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 --- drivers/md/linear.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/md/linear.c b/drivers/md/linear.c index b0c0aef92a37..12abf69d568a 100644 --- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -223,7 +223,8 @@ static int linear_add(struct mddev *mddev, struct md_rdev *rdev) * 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"); -- 2.11.0