From patchwork Mon Jun 12 15:17:42 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 9781391 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B742D60244 for ; Mon, 12 Jun 2017 15:19:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A40252850D for ; Mon, 12 Jun 2017 15:19:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 977C428517; Mon, 12 Jun 2017 15:19:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5166C2850D for ; Mon, 12 Jun 2017 15:19:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751668AbdFLPTM (ORCPT ); Mon, 12 Jun 2017 11:19:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:55182 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752496AbdFLPSR (ORCPT ); Mon, 12 Jun 2017 11:18:17 -0400 Received: from kozik-lap.dzcmts001-cpe-001.datazug.ch (pub082136089155.dh-hfc.datazug.ch [82.136.89.155]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BA7D623981; Mon, 12 Jun 2017 15:17:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BA7D623981 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=krzk@kernel.org From: Krzysztof Kozlowski To: "Rafael J. Wysocki" , Kevin Hilman , Ulf Hansson , Len Brown , Pavel Machek , Greg Kroah-Hartman , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Krzysztof Kozlowski Subject: [RFT v2 2/8] PM / Domains: Handle safely genpd_syscore_switch() call on non-genpd device Date: Mon, 12 Jun 2017 17:17:42 +0200 Message-Id: <20170612151748.7380-3-krzk@kernel.org> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170612151748.7380-1-krzk@kernel.org> References: <20170612151748.7380-1-krzk@kernel.org> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP genpd_syscore_switch() had two problems: 1. It silently assumed that device, it is being called for, belongs to generic power domain and used container_of() on its power domain pointer. Such assumption might not be true always. 2. It iterated over list of generic power domains without holding gpd_list_lock mutex thus list could have been modified in the same time. Usage of genpd_lookup_dev() solves both problems as it is safe a call for non-generic power domains and uses mutex when iterating. Reported-by: Ulf Hansson Signed-off-by: Krzysztof Kozlowski Acked-by: Ulf Hansson --- Not tested on real hardware. --- drivers/base/power/domain.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 2e8d0f423507..983f086ab235 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1098,8 +1098,8 @@ static void genpd_syscore_switch(struct device *dev, bool suspend) { struct generic_pm_domain *genpd; - genpd = dev_to_genpd(dev); - if (!pm_genpd_present(genpd)) + genpd = genpd_lookup_dev(dev); + if (!genpd) return; if (suspend) {