From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 63671C433EF for ; Thu, 10 Mar 2022 04:35:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234249AbiCJEgu (ORCPT ); Wed, 9 Mar 2022 23:36:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57230 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229769AbiCJEgt (ORCPT ); Wed, 9 Mar 2022 23:36:49 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B3B28F957D; Wed, 9 Mar 2022 20:35:49 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3511F617D7; Thu, 10 Mar 2022 04:35:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2DC5C340E8; Thu, 10 Mar 2022 04:35:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1646886948; bh=FGEeHKgGa6xAxtUm0UWusuPBT4FNS/qfCOsJTNPDB84=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=i58XivLkb4qBdQFmirKpwI9QCTayv8dGXU4cMbiZZzRvvnDqB4HU4AoH/l5QeIZ7I IRHCGSYJD/45vwFtIm4Bh7mUYqJ6y/v11CmBRSULcILxpzdNPGbBZlkJowoMLVrTaJ nbKGH0XA3F8cXZACbJZtcCs39J4M1jpXuaoPgeJp/qydk+NNe11XxFGZt8BFC3OUWQ DWcTCRoqESwhq9+PFbZmRlhfMIuJNPhj6MPVCnWYmNz2nqgjO53u3eAqZxGQz9kfmb ABwQlj9RP+mqrLaDR7+1asC/zmKc3HijP4YG9EXfghKOj0pKfD7vKw4pHroTrcnWd7 HJcLHqq1lxLag== Date: Thu, 10 Mar 2022 10:05:44 +0530 From: Vinod Koul To: Greg Kroah-Hartman Cc: Pavel Machek , linux-kernel@vger.kernel.org, stable@vger.kernel.org, Yongzhi Liu , Sasha Levin Subject: Re: [PATCH 5.10 012/105] dmaengine: shdma: Fix runtime PM imbalance on error Message-ID: References: <20220307091644.179885033@linuxfoundation.org> <20220307091644.529997660@linuxfoundation.org> <20220309105420.GA22677@duo.ucw.cz> <20220309123509.GA30506@duo.ucw.cz> <20220309135708.GB30506@duo.ucw.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On 09-03-22, 15:48, Greg Kroah-Hartman wrote: > On Wed, Mar 09, 2022 at 02:57:08PM +0100, Pavel Machek wrote: > > On Wed 2022-03-09 14:40:56, Greg Kroah-Hartman wrote: > > > On Wed, Mar 09, 2022 at 01:35:09PM +0100, Pavel Machek wrote: > > > > On Wed 2022-03-09 12:58:46, Greg Kroah-Hartman wrote: > > > > > On Wed, Mar 09, 2022 at 11:54:20AM +0100, Pavel Machek wrote: > > > > > > Hi! > > > > > > > > > > > > > From: Yongzhi Liu > > > > > > > > > > > > > > [ Upstream commit 455896c53d5b803733ddd84e1bf8a430644439b6 ] > > > > > > > > > > > > > > pm_runtime_get_() increments the runtime PM usage counter even > > > > > > > when it returns an error code, thus a matching decrement is needed on > > > > > > > the error handling path to keep the counter balanced. > > > > > > > > > > > > This patch will break things. > > > > > > > > > > > > Notice that -ret is ignored (checked 4.4 and 5.10), so we don't > > > > > > actually abort/return error; we just printk. We'll do two > > > > > > pm_runtime_put's after the "fix". > > > > > > > > > > > > Please drop from -stable. > > > > > > > > > > > > It was discussed during AUTOSEL review: > > > > > > > > > > > > Date: Fri, 25 Feb 2022 14:25:10 +0800 (GMT+08:00) > > > > > > From: 刘永志 > > > > > > To: pavel machek > > > > > > Cc: sasha levin , linux-kernel@vger.kernel.org, > > > > > > Subject: Re: [PATCH AUTOSEL 5.16 24/30] dmaengine: shdma: Fix runtime PM > > > > > > imbalance on error > > > > > > > > > > So 5.15 and 5.16 is ok, but older is not? > > > > > > > > I believe commit is wrong for mainline and all stable releases, and > > > > author seems to agree. Drop from everywhere. > > > > > > Is it reverted in Linus's tree yet? > > > > It will take you a minute to check. > > > > Take a look at the patch. There's no return in error path, thus doing > > runtime_put is clearly bogus. Should take you less than minute to > > verify. > > > > Please drop the patch. > > I want to have it reverted in Linus's tree as well, otherwise that's a > regression that people will hit. I have reverted now, it will be in -next tomorrow and in mainline during upcoming merge window -- ~Vinod