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[2620:137:e000::1:20]) by mx.google.com with ESMTP id wt7-20020a170906ee8700b007912fb7ad6esi5257765ejb.893.2022.12.01.18.51.22; Thu, 01 Dec 2022 18:51:45 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232040AbiLBCiX (ORCPT + 99 others); Thu, 1 Dec 2022 21:38:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54798 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230193AbiLBCiV (ORCPT ); Thu, 1 Dec 2022 21:38:21 -0500 Received: from out29-5.mail.aliyun.com (out29-5.mail.aliyun.com [115.124.29.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 45D9693837; Thu, 1 Dec 2022 18:38:19 -0800 (PST) X-Alimail-AntiSpam: AC=CONTINUE;BC=0.07438342|-1;CH=green;DM=|CONTINUE|false|;DS=CONTINUE|ham_system_inform|0.0033058-0.00464087-0.992053;FP=0|0|0|0|0|-1|-1|-1;HT=ay29a033018047190;MF=kant@allwinnertech.com;NM=1;PH=DS;RN=6;RT=6;SR=0;TI=SMTPD_---.QLqU9kr_1669948695; Received: from SunxiBot.allwinnertech.com(mailfrom:kant@allwinnertech.com fp:SMTPD_---.QLqU9kr_1669948695) by smtp.aliyun-inc.com; Fri, 02 Dec 2022 10:38:16 +0800 From: Kant Fan To: myungjoo.ham@samsung.com, kyungmin.park@samsung.com Cc: cw00.choi@samsung.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH 5.4-] PM/devfreq: governor: Add a private governor_data for governor Date: Fri, 2 Dec 2022 10:38:12 +0800 Message-Id: <20221202023812.84174-1-kant@allwinnertech.com> X-Mailer: git-send-email 2.29.0 MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1751068973037849315?= X-GMAIL-MSGID: =?utf-8?q?1751068973037849315?= Commit fbd567e56942ecc4da906c4f3f3652c94773af5b upstream. The member void *data in the structure devfreq can be overwrite by governor_userspace. For example: 1. The device driver assigned the devfreq governor to simple_ondemand by the function devfreq_add_device() and init the devfreq member void *data to a pointer of a static structure devfreq_simple_ondemand_data by the function devfreq_add_device(). 2. The user changed the devfreq governor to userspace by the command "echo userspace > /sys/class/devfreq/.../governor". 3. The governor userspace alloced a dynamic memory for the struct userspace_data and assigend the member void *data of devfreq to this memory by the function userspace_init(). 4. The user changed the devfreq governor back to simple_ondemand by the command "echo simple_ondemand > /sys/class/devfreq/.../governor". 5. The governor userspace exited and assigned the member void *data in the structure devfreq to NULL by the function userspace_exit(). 6. The governor simple_ondemand fetched the static information of devfreq_simple_ondemand_data in the function devfreq_simple_ondemand_func() but the member void *data of devfreq was assigned to NULL by the function userspace_exit(). 7. The information of upthreshold and downdifferential is lost and the governor simple_ondemand can't work correctly. The member void *data in the structure devfreq is designed for a static pointer used in a governor and inited by the function devfreq_add_device(). This patch add an element named governor_data in the devfreq structure which can be used by a governor(E.g userspace) who want to assign a private data to do some private things. Fixes: ce26c5bb9569 ("PM / devfreq: Add basic governors") Cc: stable@vger.kernel.org # 5.4- Signed-off-by: Kant Fan --- drivers/devfreq/devfreq.c | 6 ++---- drivers/devfreq/governor_userspace.c | 12 ++++++------ include/linux/devfreq.h | 7 ++++--- 3 files changed, 12 insertions(+), 13 deletions(-) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index c79652ee94be..93efaf69d08e 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -603,8 +603,7 @@ static void devfreq_dev_release(struct device *dev) * @dev: the device to add devfreq feature. * @profile: device-specific profile to run devfreq. * @governor_name: name of the policy to choose frequency. - * @data: private data for the governor. The devfreq framework does not - * touch this value. + * @data: devfreq driver pass to governors, governor should not change it. */ struct devfreq *devfreq_add_device(struct device *dev, struct devfreq_dev_profile *profile, @@ -788,8 +787,7 @@ static void devm_devfreq_dev_release(struct device *dev, void *res) * @dev: the device to add devfreq feature. * @profile: device-specific profile to run devfreq. * @governor_name: name of the policy to choose frequency. - * @data: private data for the governor. The devfreq framework does not - * touch this value. + * @data: devfreq driver pass to governors, governor should not change it. * * This function manages automatically the memory of devfreq device using device * resource management and simplify the free operation for memory of devfreq diff --git a/drivers/devfreq/governor_userspace.c b/drivers/devfreq/governor_userspace.c index af94942fcf95..a3ae4dc4668b 100644 --- a/drivers/devfreq/governor_userspace.c +++ b/drivers/devfreq/governor_userspace.c @@ -21,7 +21,7 @@ struct userspace_data { static int devfreq_userspace_func(struct devfreq *df, unsigned long *freq) { - struct userspace_data *data = df->data; + struct userspace_data *data = df->governor_data; if (data->valid) *freq = data->user_frequency; @@ -40,7 +40,7 @@ static ssize_t store_freq(struct device *dev, struct device_attribute *attr, int err = 0; mutex_lock(&devfreq->lock); - data = devfreq->data; + data = devfreq->governor_data; sscanf(buf, "%lu", &wanted); data->user_frequency = wanted; @@ -60,7 +60,7 @@ static ssize_t show_freq(struct device *dev, struct device_attribute *attr, int err = 0; mutex_lock(&devfreq->lock); - data = devfreq->data; + data = devfreq->governor_data; if (data->valid) err = sprintf(buf, "%lu\n", data->user_frequency); @@ -91,7 +91,7 @@ static int userspace_init(struct devfreq *devfreq) goto out; } data->valid = false; - devfreq->data = data; + devfreq->governor_data = data; err = sysfs_create_group(&devfreq->dev.kobj, &dev_attr_group); out: @@ -107,8 +107,8 @@ static void userspace_exit(struct devfreq *devfreq) if (devfreq->dev.kobj.sd) sysfs_remove_group(&devfreq->dev.kobj, &dev_attr_group); - kfree(devfreq->data); - devfreq->data = NULL; + kfree(devfreq->governor_data); + devfreq->governor_data = NULL; } static int devfreq_userspace_handler(struct devfreq *devfreq, diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index 2bae9ed3c783..6cbc6d1ae32f 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -121,8 +121,8 @@ struct devfreq_dev_profile { * devfreq.nb to the corresponding register notifier call chain. * @work: delayed work for load monitoring. * @previous_freq: previously configured frequency value. - * @data: Private data of the governor. The devfreq framework does not - * touch this. + * @data: devfreq driver pass to governors, governor should not change it. + * @governor_data: private data for governors, devfreq core doesn't touch it. * @min_freq: Limit minimum frequency requested by user (0: none) * @max_freq: Limit maximum frequency requested by user (0: none) * @scaling_min_freq: Limit minimum frequency requested by OPP interface @@ -159,7 +159,8 @@ struct devfreq { unsigned long previous_freq; struct devfreq_dev_status last_status; - void *data; /* private data for governors */ + void *data; + void *governor_data; unsigned long min_freq; unsigned long max_freq;