From patchwork Mon Jan 11 17:35:52 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Juri Lelli X-Patchwork-Id: 59564 Delivered-To: patch@linaro.org Received: by 10.112.130.2 with SMTP id oa2csp2253436lbb; Mon, 11 Jan 2016 09:40:41 -0800 (PST) X-Received: by 10.66.216.69 with SMTP id oo5mr10582289pac.126.1452534040660; Mon, 11 Jan 2016 09:40:40 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id la16si20437092pab.64.2016.01.11.09.40.40; Mon, 11 Jan 2016 09:40:40 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761507AbcAKRkP (ORCPT + 29 others); Mon, 11 Jan 2016 12:40:15 -0500 Received: from foss.arm.com ([217.140.101.70]:57259 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761187AbcAKRhe (ORCPT ); Mon, 11 Jan 2016 12:37:34 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 596CA5F9; Mon, 11 Jan 2016 09:36:59 -0800 (PST) Received: from e106622-lin.cambridge.arm.com (e106622-lin.cambridge.arm.com [10.1.208.152]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 508EB3F24D; Mon, 11 Jan 2016 09:37:32 -0800 (PST) From: Juri Lelli To: linux-kernel@vger.kernel.org Cc: linux-pm@vger.kernel.org, peterz@infradead.org, rjw@rjwysocki.net, viresh.kumar@linaro.org, mturquette@baylibre.com, steve.muckle@linaro.org, vincent.guittot@linaro.org, morten.rasmussen@arm.com, dietmar.eggemann@arm.com, juri.lelli@arm.com Subject: [RFC PATCH 11/19] cpufreq: assert policy->rwsem is held in __cpufreq_governor Date: Mon, 11 Jan 2016 17:35:52 +0000 Message-Id: <1452533760-13787-12-git-send-email-juri.lelli@arm.com> X-Mailer: git-send-email 2.2.2 In-Reply-To: <1452533760-13787-1-git-send-email-juri.lelli@arm.com> References: <1452533760-13787-1-git-send-email-juri.lelli@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org __cpufreq_governor works on policy, so policy->rwsem has to be held. Add assertion for such condition. Cc: "Rafael J. Wysocki" Cc: Viresh Kumar Signed-off-by: Juri Lelli --- drivers/cpufreq/cpufreq.c | 3 +++ 1 file changed, 3 insertions(+) -- 2.2.2 diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index f1f9fbc..e7fc5c9 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1950,6 +1950,9 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, /* Don't start any governor operations if we are entering suspend */ if (cpufreq_suspended) return 0; + + lockdep_assert_held(&policy->rwsem); + /* * Governor might not be initiated here if ACPI _PPC changed * notification happened, so check it.