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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B807BCD37B4 for ; Wed, 4 Sep 2024 14:21:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Kk4gO4tbQk5myT6H6EDFsqisfzOOs2qLr0/0+zkookg=; b=BUsqgm/RW1E4fFTl5e+tpSRpds DdRPwunhYZWbsNdRtcUMAUZ2l4dOuFegcJ4slR4mpIRf8XTy5mFoD8Q403XZk+XP75mK9VlfbpWTV dDpqmTF7DJDRKs49sUw/Llno3H9fFCywRmpg9Lr6PGrIMZbCpo3IW1KN6j7HEtyqPgYfMD6koZpv7 6uJro04RVhmvYpEOwj4VxxZxihrPACsvgPxQc5xpsTI0KAufeLTGvZnKqHSCsyEleUZVKhC6L4+fB 7ZbL0AyPtK8A3IHazlZzEF82JKoWiud550o6OnlfC9y010lxMrAZX0g5EGdJb49+ohi84ZRPoi7x5 +BqXkjlw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1slqsT-00000004l9J-0onI; Wed, 04 Sep 2024 14:20:57 +0000 Received: from nyc.source.kernel.org ([147.75.193.91]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1slqrE-00000004kpP-1aFk; Wed, 04 Sep 2024 14:19:41 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 4B26BA443D9; Wed, 4 Sep 2024 14:19:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 69EBAC4CEC2; Wed, 4 Sep 2024 14:19:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1725459579; bh=oJyojKlM/C+yToRnqM61qH45uf5mvwOG2dI32gxQlVY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=VsxZhY4V0mf3a2d/nphDZnpSQbeATEFV2iWzKcgNiqFq3MK1wzCFozOuuM96c+hfO o5xvwTy/ZprJM0nwFKHBACbxX33x87jALH/yvWjl/JpEDx0J0AyOOWfqqn5F+ganVO 24aZScIodimjbkN4WpJpj+dDukoEyVutGRdBOM0U= Date: Wed, 4 Sep 2024 16:19:36 +0200 From: Greg Kroah-Hartman To: Yenchia Chen Cc: stable@vger.kernel.org, "Rafael J. Wysocki" , "Rafael J. Wysocki" , Len Brown , Pavel Machek , Matthias Brugger , AngeloGioacchino Del Regno , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: Re: [PATCH 6.6 1/1] PM: sleep: Restore asynchronous device resume optimization Message-ID: <2024090420-protozoan-clench-cca7@gregkh> References: <20240902093249.17275-1-yenchia.chen@mediatek.com> <20240902093249.17275-2-yenchia.chen@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240902093249.17275-2-yenchia.chen@mediatek.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240904_071940_547283_FED80426 X-CRM114-Status: GOOD ( 15.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Sep 02, 2024 at 05:32:48PM +0800, Yenchia Chen wrote: > From: "Rafael J. Wysocki" > > commit 3e999770ac1c7c31a70685dd5b88e89473509e9c upstream. > > Before commit 7839d0078e0d ("PM: sleep: Fix possible deadlocks in core > system-wide PM code"), the resume of devices that were allowed to resume > asynchronously was scheduled before starting the resume of the other > devices, so the former did not have to wait for the latter unless > functional dependencies were present. > > Commit 7839d0078e0d removed that optimization in order to address a > correctness issue, but it can be restored with the help of a new device > power management flag, so do that now. > > Signed-off-by: Rafael J. Wysocki > Reviewed-by: Stanislaw Gruszka > Signed-off-by: Yenchia Chen > --- > drivers/base/power/main.c | 117 +++++++++++++++++++++----------------- > include/linux/pm.h | 1 + > 2 files changed, 65 insertions(+), 53 deletions(-) Why does this need to be backported? What bug is it fixing? confused, greg k-h