From patchwork Sat Mar 12 04:59:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kant Fan X-Patchwork-Id: 12778732 X-Patchwork-Delegate: cw00.choi@samsung.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C1FF5C433EF for ; Sat, 12 Mar 2022 04:59:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229462AbiCLFAb (ORCPT ); Sat, 12 Mar 2022 00:00:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40690 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229379AbiCLFAb (ORCPT ); Sat, 12 Mar 2022 00:00:31 -0500 Received: from out29-149.mail.aliyun.com (out29-149.mail.aliyun.com [115.124.29.149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EA9C7369FF; Fri, 11 Mar 2022 20:59:24 -0800 (PST) X-Alimail-AntiSpam: AC=CONTINUE;BC=0.07676834|-1;BR=01201311R121S41rulernew998_84748_2000303;CH=blue;DM=|CONTINUE|false|;DS=CONTINUE|ham_alarm|0.00954498-0.000797976-0.989657;FP=0|0|0|0|0|-1|-1|-1;HT=ay29a033018047190;MF=kant@allwinnertech.com;NM=1;PH=DS;RN=7;RT=7;SR=0;TI=SMTPD_---.N2bFlkM_1647061161; Received: from sunxibot.allwinnertech.com(mailfrom:kant@allwinnertech.com fp:SMTPD_---.N2bFlkM_1647061161) by smtp.aliyun-inc.com(10.147.40.233); Sat, 12 Mar 2022 12:59:22 +0800 From: Kant Fan To: rafael@kernel.org (supporter:THERMAL), daniel.lezcano@linaro.org (supporter:THERMAL) Cc: Kant Fan , Amit Kucheria , Zhang Rui , linux-pm@vger.kernel.org (open list:THERMAL), linux-kernel@vger.kernel.org (open list) Subject: [PATCH] thermal: devfreq_cooling: use local ops instead of global ops Date: Sat, 12 Mar 2022 12:59:21 +0800 Message-Id: <20220312045922.9779-1-kant@allwinnertech.com> X-Mailer: git-send-email 2.29.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Fix access illegal address problem in following condition: There are muti devfreq cooling devices in system, some of them has em model but other does not, energy model ops such as state2power will append to global devfreq_cooling_ops when the cooling device with em model register. It makes the cooling device without em model also use devfreq_cooling_ops after appending when register later by of_devfreq_cooling_register_power() or of_devfreq_cooling_register(). IPA governor regards the cooling devices without em model as a power actor because they also have energy model ops, and will access illegal address at dfc->em_pd when execute cdev->ops->get_requested_power, cdev->ops->state2power or cdev->ops->power2state. Signed-off-by: Kant Fan --- drivers/thermal/devfreq_cooling.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-) diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_cooling.c index 4310cb342a9f..d38a80adec73 100644 --- a/drivers/thermal/devfreq_cooling.c +++ b/drivers/thermal/devfreq_cooling.c @@ -358,21 +358,28 @@ of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, struct thermal_cooling_device *cdev; struct device *dev = df->dev.parent; struct devfreq_cooling_device *dfc; + struct thermal_cooling_device_ops *ops; char *name; int err, num_opps; - dfc = kzalloc(sizeof(*dfc), GFP_KERNEL); - if (!dfc) + ops = kmemdup(&devfreq_cooling_ops, sizeof(*ops), GFP_KERNEL); + if (!ops) return ERR_PTR(-ENOMEM); + dfc = kzalloc(sizeof(*dfc), GFP_KERNEL); + if (!dfc) { + err = -ENOMEM; + goto free_ops; + } + dfc->devfreq = df; dfc->em_pd = em_pd_get(dev); if (dfc->em_pd) { - devfreq_cooling_ops.get_requested_power = + ops->get_requested_power = devfreq_cooling_get_requested_power; - devfreq_cooling_ops.state2power = devfreq_cooling_state2power; - devfreq_cooling_ops.power2state = devfreq_cooling_power2state; + ops->state2power = devfreq_cooling_state2power; + ops->power2state = devfreq_cooling_power2state; dfc->power_ops = dfc_power; @@ -407,8 +414,7 @@ of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, if (!name) goto remove_qos_req; - cdev = thermal_of_cooling_device_register(np, name, dfc, - &devfreq_cooling_ops); + cdev = thermal_of_cooling_device_register(np, name, dfc, ops); kfree(name); if (IS_ERR(cdev)) { @@ -429,6 +435,8 @@ of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, kfree(dfc->freq_table); free_dfc: kfree(dfc); +free_ops: + kfree(ops); return ERR_PTR(err); } @@ -510,11 +518,13 @@ EXPORT_SYMBOL_GPL(devfreq_cooling_em_register); void devfreq_cooling_unregister(struct thermal_cooling_device *cdev) { struct devfreq_cooling_device *dfc; + const struct thermal_cooling_device_ops *ops; struct device *dev; if (IS_ERR_OR_NULL(cdev)) return; + ops = cdev->ops; dfc = cdev->devdata; dev = dfc->devfreq->dev.parent; @@ -525,5 +535,6 @@ void devfreq_cooling_unregister(struct thermal_cooling_device *cdev) kfree(dfc->freq_table); kfree(dfc); + kfree(ops); } EXPORT_SYMBOL_GPL(devfreq_cooling_unregister);