From patchwork Thu Oct 1 22:23:02 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: srinivas pandruvada X-Patchwork-Id: 7312111 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 41AF79F314 for ; Thu, 1 Oct 2015 22:24:09 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 6D38D207E7 for ; Thu, 1 Oct 2015 22:24:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 99B41207D7 for ; Thu, 1 Oct 2015 22:24:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751417AbbJAWYA (ORCPT ); Thu, 1 Oct 2015 18:24:00 -0400 Received: from mga09.intel.com ([134.134.136.24]:51414 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751055AbbJAWX6 (ORCPT ); Thu, 1 Oct 2015 18:23:58 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga102.jf.intel.com with ESMTP; 01 Oct 2015 15:23:58 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.17,619,1437462000"; d="scan'208";a="817535759" Received: from spandruv-mobl3.jf.intel.com ([10.24.150.109]) by orsmga002.jf.intel.com with ESMTP; 01 Oct 2015 15:23:57 -0700 From: Srinivas Pandruvada To: rafael.j.wysocki@intel.com, viresh.kumar@linaro.org Cc: linux-pm@vger.kernel.org, Srinivas Pandruvada Subject: [PATCH 2/2] cpufreq: prevent lockup on reading scaling_available_frequencies Date: Thu, 1 Oct 2015 15:23:02 -0700 Message-Id: <1443738182-4077-2-git-send-email-srinivas.pandruvada@linux.intel.com> X-Mailer: git-send-email 2.4.3 In-Reply-To: <1443738182-4077-1-git-send-email-srinivas.pandruvada@linux.intel.com> References: <1443738182-4077-1-git-send-email-srinivas.pandruvada@linux.intel.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When scaling_available_frequencies is read on an offlined cpu, then either lockup or junk values are displayed. This is caused by freed freq_table, which policy is using. Signed-off-by: Srinivas Pandruvada Acked-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index ef5ed94..25c4c15 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1436,8 +1436,10 @@ static void cpufreq_offline_finish(unsigned int cpu) * since this is a core component, and is essential for the * subsequent light-weight ->init() to succeed. */ - if (cpufreq_driver->exit) + if (cpufreq_driver->exit) { cpufreq_driver->exit(policy); + policy->freq_table = NULL; + } } /**