From patchwork Mon May 11 11:19:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Luba X-Patchwork-Id: 211410 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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 12810C47255 for ; Mon, 11 May 2020 11:21:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F1A3620736 for ; Mon, 11 May 2020 11:21:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729716AbgEKLVd (ORCPT ); Mon, 11 May 2020 07:21:33 -0400 Received: from foss.arm.com ([217.140.110.172]:57552 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729333AbgEKLVd (ORCPT ); Mon, 11 May 2020 07:21:33 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A5831101E; Mon, 11 May 2020 04:21:32 -0700 (PDT) Received: from e123648.arm.com (unknown [10.37.12.83]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 766E33F305; Mon, 11 May 2020 04:21:22 -0700 (PDT) From: Lukasz Luba To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org, linux-omap@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-imx@nxp.com Cc: Dietmar.Eggemann@arm.com, cw00.choi@samsung.com, b.zolnierkie@samsung.com, rjw@rjwysocki.net, sudeep.holla@arm.com, viresh.kumar@linaro.org, nm@ti.com, sboyd@kernel.org, rui.zhang@intel.com, amit.kucheria@verdurent.com, daniel.lezcano@linaro.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, rostedt@goodmis.org, qperret@google.com, bsegall@google.com, mgorman@suse.de, shawnguo@kernel.org, s.hauer@pengutronix.de, festevam@gmail.com, kernel@pengutronix.de, khilman@kernel.org, agross@kernel.org, bjorn.andersson@linaro.org, robh@kernel.org, matthias.bgg@gmail.com, steven.price@arm.com, tomeu.vizoso@collabora.com, alyssa.rosenzweig@collabora.com, airlied@linux.ie, daniel@ffwll.ch, liviu.dudau@arm.com, lorenzo.pieralisi@arm.com, lukasz.luba@arm.com, patrick.bellasi@matbug.net, orjan.eide@arm.com, rdunlap@infradead.org, mka@chromium.org Subject: [PATCH v7 11/15] thermal: devfreq_cooling: work on a copy of device status Date: Mon, 11 May 2020 12:19:08 +0100 Message-Id: <20200511111912.3001-12-lukasz.luba@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200511111912.3001-1-lukasz.luba@arm.com> References: <20200511111912.3001-1-lukasz.luba@arm.com> Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org Devfreq framework can change the device status in the background. To mitigate this situation make a copy of the status structure and use it for internal calculations. Signed-off-by: Lukasz Luba --- drivers/thermal/devfreq_cooling.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_cooling.c index 396f16bb6566..36ec6a48606c 100644 --- a/drivers/thermal/devfreq_cooling.c +++ b/drivers/thermal/devfreq_cooling.c @@ -348,14 +348,20 @@ static int devfreq_cooling_power2state(struct thermal_cooling_device *cdev, { struct devfreq_cooling_device *dfc = cdev->devdata; struct devfreq *df = dfc->devfreq; - struct devfreq_dev_status *status = &df->last_status; - unsigned long freq = status->current_frequency; + struct devfreq_dev_status status; unsigned long busy_time; + unsigned long freq; s32 dyn_power; u32 static_power; s32 est_power; int i; + mutex_lock(&df->lock); + status = df->last_status; + mutex_unlock(&df->lock); + + freq = status.current_frequency; + if (dfc->power_ops->get_real_power) { /* Scale for resource utilization */ est_power = power * dfc->res_util; @@ -367,8 +373,8 @@ static int devfreq_cooling_power2state(struct thermal_cooling_device *cdev, dyn_power = dyn_power > 0 ? dyn_power : 0; /* Scale dynamic power for utilization */ - busy_time = status->busy_time ?: 1; - est_power = (dyn_power * status->total_time) / busy_time; + busy_time = status.busy_time ?: 1; + est_power = (dyn_power * status.total_time) / busy_time; } /*