From patchwork Thu May 20 09:23:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 444207 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44832C433B4 for ; Thu, 20 May 2021 10:41:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E41D60FF3 for ; Thu, 20 May 2021 10:41:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237725AbhETKnA (ORCPT ); Thu, 20 May 2021 06:43:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:44060 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237395AbhETKlE (ORCPT ); Thu, 20 May 2021 06:41:04 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9F5C561363; Thu, 20 May 2021 09:55:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621504552; bh=8ECmGFAofV+bbpLcSvZSp8ySpsLfNcKRbrYCBBB0ZdI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ypRQykzFNmMkwyu+pffNwhY9lbXggYzL+vZ7ul0yBkROH0xdTVV5Gy2ZeAiaRID9l 5n0Z0AsFbEoq0pR9v70gl72CULEPnpfN4LB5pSmliuFyNSKDRWQPn8XpAWjECkWq3w DwvYBwL0sHQIrwMakh5bhBfS9D76i7AUvH/BLqKY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lukasz Luba , Daniel Lezcano Subject: [PATCH 4.14 297/323] thermal/core/fair share: Lock the thermal zone while looping over instances Date: Thu, 20 May 2021 11:23:09 +0200 Message-Id: <20210520092130.395565199@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092120.115153432@linuxfoundation.org> References: <20210520092120.115153432@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Lukasz Luba commit fef05776eb02238dcad8d5514e666a42572c3f32 upstream. The tz->lock must be hold during the looping over the instances in that thermal zone. This lock was missing in the governor code since the beginning, so it's hard to point into a particular commit. CC: stable@vger.kernel.org # 4.4+ Signed-off-by: Lukasz Luba Signed-off-by: Daniel Lezcano Link: https://lore.kernel.org/r/20210422153624.6074-2-lukasz.luba@arm.com Signed-off-by: Greg Kroah-Hartman --- drivers/thermal/fair_share.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/thermal/fair_share.c +++ b/drivers/thermal/fair_share.c @@ -94,6 +94,8 @@ static int fair_share_throttle(struct th int total_instance = 0; int cur_trip_level = get_trip_level(tz); + mutex_lock(&tz->lock); + list_for_each_entry(instance, &tz->thermal_instances, tz_node) { if (instance->trip != trip) continue; @@ -122,6 +124,8 @@ static int fair_share_throttle(struct th mutex_unlock(&instance->cdev->lock); thermal_cdev_update(cdev); } + + mutex_unlock(&tz->lock); return 0; }