From patchwork Mon Jan 11 17:35:46 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Juri Lelli X-Patchwork-Id: 59552 Delivered-To: patch@linaro.org Received: by 10.112.130.2 with SMTP id oa2csp2251743lbb; Mon, 11 Jan 2016 09:37:36 -0800 (PST) X-Received: by 10.66.235.202 with SMTP id uo10mr51431087pac.63.1452533856713; Mon, 11 Jan 2016 09:37:36 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id z11si29781805pfa.153.2016.01.11.09.37.35; Mon, 11 Jan 2016 09:37:36 -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 S1761052AbcAKRhZ (ORCPT + 29 others); Mon, 11 Jan 2016 12:37:25 -0500 Received: from foss.arm.com ([217.140.101.70]:57228 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760496AbcAKRhV (ORCPT ); Mon, 11 Jan 2016 12:37:21 -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 B74A75EF; Mon, 11 Jan 2016 09:36:46 -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 ABABE3F24D; Mon, 11 Jan 2016 09:37:19 -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 05/19] cpufreq: assert locking when accessing cpufreq_policy_list Date: Mon, 11 Jan 2016 17:35:46 +0000 Message-Id: <1452533760-13787-6-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_policy_list is guarded by cpufreq_driver_lock. Add appropriate locking assertions to check that we always access the list while holding the associated lock. 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 00a00cd..63d6efb 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -65,6 +65,7 @@ static bool suitable_policy(struct cpufreq_policy *policy, bool active) static struct cpufreq_policy *next_policy(struct cpufreq_policy *policy, bool active) { + lockdep_assert_held(&cpufreq_driver_lock); do { policy = list_next_entry(policy, policy_list); @@ -80,6 +81,7 @@ static struct cpufreq_policy *first_policy(bool active) { struct cpufreq_policy *policy; + lockdep_assert_held(&cpufreq_driver_lock); /* No policies in the list */ if (list_empty(&cpufreq_policy_list)) return NULL; @@ -2430,6 +2432,7 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) if (ret) goto err_boost_unreg; + lockdep_assert_held(&cpufreq_driver_lock); if (!(cpufreq_driver->flags & CPUFREQ_STICKY) && list_empty(&cpufreq_policy_list)) { /* if all ->init() calls failed, unregister */