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Tue, 09 Mar 2021 08:12:48 -0800 (PST) Subject: Re: [PATCH 07/11] PM / devfreq: check get_dev_status before start monitor From: Chanwoo Choi To: Dong Aisheng , linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: dongas86@gmail.com, kernel@pengutronix.de, shawnguo@kernel.org, linux-imx@nxp.com, linux-kernel@vger.kernel.org, myungjoo.ham@samsung.com, kyungmin.park@samsung.com, cw00.choi@samsung.com, abel.vesa@nxp.com References: <1615294733-22761-1-git-send-email-aisheng.dong@nxp.com> <1615294733-22761-8-git-send-email-aisheng.dong@nxp.com> Message-ID: Date: Wed, 10 Mar 2021 01:12:40 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21. 3. 10. 오전 12:58, Chanwoo Choi wrote: > On 21. 3. 9. 오후 9:58, Dong Aisheng wrote: >> The devfreq monitor depends on the device to provide load information >> by .get_dev_status() to calculate the next target freq. >> >> And this will cause changing governor to simple ondemand fail >> if device can't support. >> >> Signed-off-by: Dong Aisheng >> --- >>   drivers/devfreq/devfreq.c                 | 10 +++++++--- >>   drivers/devfreq/governor.h                |  2 +- >>   drivers/devfreq/governor_simpleondemand.c |  3 +-- >>   3 files changed, 9 insertions(+), 6 deletions(-) >> >> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c >> index 7231fe6862a2..d1787b6c7d7c 100644 >> --- a/drivers/devfreq/devfreq.c >> +++ b/drivers/devfreq/devfreq.c >> @@ -482,10 +482,13 @@ static void devfreq_monitor(struct work_struct >> *work) >>    * to be called from governor in response to DEVFREQ_GOV_START >>    * event when device is added to devfreq framework. >>    */ >> -void devfreq_monitor_start(struct devfreq *devfreq) >> +int devfreq_monitor_start(struct devfreq *devfreq) >>   { >>       if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) >> -        return; >> +        return 0; >> + >> +    if (!devfreq->profile->get_dev_status) >> +        return -EINVAL; Again, I think that get_dev_status is not used for all governors. So that it cause the governor start fail. Don't check whether .get_dev_status is NULL or not. >>       switch (devfreq->profile->timer) { >>       case DEVFREQ_TIMER_DEFERRABLE: >> @@ -495,12 +498,13 @@ void devfreq_monitor_start(struct devfreq *devfreq) >>           INIT_DELAYED_WORK(&devfreq->work, devfreq_monitor); >>           break; >>       default: >> -        return; >> +        return -EINVAL; >>       } >>       if (devfreq->profile->polling_ms) >>           queue_delayed_work(devfreq_wq, &devfreq->work, >>               msecs_to_jiffies(devfreq->profile->polling_ms)); >> +    return 0; >>   } >>   EXPORT_SYMBOL(devfreq_monitor_start); >> diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h >> index 5cee3f64fe2b..31af6d072a10 100644 >> --- a/drivers/devfreq/governor.h >> +++ b/drivers/devfreq/governor.h >> @@ -75,7 +75,7 @@ struct devfreq_governor { >>                   unsigned int event, void *data); >>   }; >> -void devfreq_monitor_start(struct devfreq *devfreq); >> +int devfreq_monitor_start(struct devfreq *devfreq); >>   void devfreq_monitor_stop(struct devfreq *devfreq); >>   void devfreq_monitor_suspend(struct devfreq *devfreq); >>   void devfreq_monitor_resume(struct devfreq *devfreq); >> diff --git a/drivers/devfreq/governor_simpleondemand.c >> b/drivers/devfreq/governor_simpleondemand.c >> index d57b82a2b570..ea287b57cbf3 100644 >> --- a/drivers/devfreq/governor_simpleondemand.c >> +++ b/drivers/devfreq/governor_simpleondemand.c >> @@ -89,8 +89,7 @@ static int devfreq_simple_ondemand_handler(struct >> devfreq *devfreq, >>   { >>       switch (event) { >>       case DEVFREQ_GOV_START: >> -        devfreq_monitor_start(devfreq); >> -        break; >> +        return devfreq_monitor_start(devfreq); >>       case DEVFREQ_GOV_STOP: >>           devfreq_monitor_stop(devfreq); >> > > Need to handle the all points of devfreq_monitor_start() usage. > please check the tegra30-devfreq.c for this update. > > $ grep -rn "devfreq_monitor_start" drivers/ > drivers/devfreq/governor_simpleondemand.c:92: > devfreq_monitor_start(devfreq); > drivers/devfreq/tegra30-devfreq.c:744: > devfreq_monitor_start(devfreq); > ...... > -- Best Regards, Samsung Electronics Chanwoo Choi From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.2 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 9FDA2C433DB for ; Tue, 9 Mar 2021 16:14:24 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher 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