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=-3.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 8AE22C48BD3 for ; Wed, 26 Jun 2019 10:20:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4E9C520B1F for ; Wed, 26 Jun 2019 10:20:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="yWOsM+MS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726778AbfFZKT7 (ORCPT ); Wed, 26 Jun 2019 06:19:59 -0400 Received: from mail-wr1-f66.google.com ([209.85.221.66]:39222 "EHLO mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726077AbfFZKT7 (ORCPT ); Wed, 26 Jun 2019 06:19:59 -0400 Received: by mail-wr1-f66.google.com with SMTP id x4so2062938wrt.6 for ; Wed, 26 Jun 2019 03:19:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=subject:to:cc:references:from:openpgp:autocrypt:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=eqxkIQ2gfMcOm07YboB3YuAHE5CN9FSjgEDC065L9w8=; b=yWOsM+MSG8NdZuS36JBR36QqIAZvkBe6jRhiyfiNgSabYUqFu/ZNfLfyWd3Z0ssrtq FJpL86FVWiyzL//PBzairlqt6II+o+HLZtOJZnPh7MMYamDTocbHhRLnjhIeN1UUk+zk nxt7YP6D6ONacBhyT5JvbyUym0NJveh/Ef7hkne90kHhbeMkYwdtlqzXi/U97NHtNC9Z 3R2RFTbz5mXhvXKXsf5pjJRPD2RrL+sJtMZFqCDS/c67Qhj64a0ksscFF8ilYLG5H09V GRDjpHXqhTrX/O6SqEb4so/BwTkZo1hBhupzg2KlLz2nxC2szlYyfVLSo+DojEt21X3x Dpiw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:openpgp:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=eqxkIQ2gfMcOm07YboB3YuAHE5CN9FSjgEDC065L9w8=; b=D4m9VuMVL4KT/2ZUFaffDOO8r75Pxy7tNE7zTLGk1ejzgN2Ff6y7MXInatIywTYWHO rIkHU5ZSR1ZReE2RLG0uUjn+pc4zI42WtzjzGmy5NaGfGKLR5v4bipmOo2c6XgtOi4OF XHEzRCxEZeRvf9Htbtp9GG/o1Jw2VxRZgmFcID0HpCSNqIBWZUmkm/iL2QKk5MredIhl W77A5+cpQqVDJDQBVE1kYKe+QPYyPmMFOmeiFAJK/KXltbu7nEtXAFMNHhwXruVVLf0I +3XGmxoPKQFcmQx6JjMHbcEANeplgMT8Iwa4co/erpobA2l5Mvk9RnQqgw3Khm2aUNWM vS7w== X-Gm-Message-State: APjAAAWDfpqTI9E0I4rR2DhF8BXVzcoyFHjhbWmLYO+gndcsV/EbSxjb wGH3+dNS0RFeNB7s63UapL0ATA== X-Google-Smtp-Source: APXvYqxpWeMZ/gJp+P/UTpQaRu2M8uCUV3artFaU6oXQMLT+W+CvNDNq8EhcvKj7XzxMzLztdcHWjA== X-Received: by 2002:a5d:518c:: with SMTP id k12mr3074586wrv.322.1561544395865; Wed, 26 Jun 2019 03:19:55 -0700 (PDT) Received: from [192.168.0.41] (26.92.130.77.rev.sfr.net. [77.130.92.26]) by smtp.googlemail.com with ESMTPSA id o6sm2210047wmc.46.2019.06.26.03.19.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 26 Jun 2019 03:19:55 -0700 (PDT) Subject: Re: [PATCH V3 2/3] thermal/drivers/cpu_cooling: Unregister with the policy To: "Rafael J. Wysocki" , Viresh Kumar Cc: "Rafael J. Wysocki" , Eduardo Valentin , Linux Kernel Mailing List , Sudeep Holla , Amit Daniel Kachhap , Javi Merino , Zhang Rui , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Keerthy , "open list:CPU FREQUENCY DRIVERS - ARM BIG LITTLE" , "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" , "open list:TI BANDGAP AND THERMAL DRIVER" References: <20190625113244.18146-1-daniel.lezcano@linaro.org> <20190625113244.18146-2-daniel.lezcano@linaro.org> <20190626025831.jmyzyypxr6ezpbtu@vireshk-i7> <20190626063716.cechnzsb75q5lclr@vireshk-i7> From: Daniel Lezcano Openpgp: preference=signencrypt Autocrypt: addr=daniel.lezcano@linaro.org; prefer-encrypt=mutual; keydata= mQINBFv/yykBEADDdW8RZu7iZILSf3zxq5y8YdaeyZjI/MaqgnvG/c3WjFaunoTMspeusiFE sXvtg3ehTOoyD0oFjKkHaia1Zpa1m/gnNdT/WvTveLfGA1gH+yGes2Sr53Ht8hWYZFYMZc8V 2pbSKh8wepq4g8r5YI1XUy9YbcTdj5mVrTklyGWA49NOeJz2QbfytMT3DJmk40LqwK6CCSU0 9Ed8n0a+vevmQoRZJEd3Y1qXn2XHys0F6OHCC+VLENqNNZXdZE9E+b3FFW0lk49oLTzLRNIq 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adkDXtr4MeL8BaB7Ij2oyRVjXUwhFQNKi5Z5Rve0a3zvGkkqw8Mz20BOksjSWjAF6g9byukl CUVjC03PdMSufNLK06x5hPc/c4tFR4J9cLrV+XxdCX7r0zGos9SzTPGNuIk1LK++S3EJhLFj 4eoWtNhMWc1uiTf9ENza0ntqH9XBWEQ6IA1gubCniGG+Xg== Message-ID: <8a9b7bd0-9b21-1ce1-6176-cffff4b8d739@linaro.org> Date: Wed, 26 Jun 2019 12:19:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 26/06/2019 11:06, Rafael J. Wysocki wrote: > On Wed, Jun 26, 2019 at 8:37 AM Viresh Kumar wrote: >> >> On 26-06-19, 08:02, Daniel Lezcano wrote: >>> On 26/06/2019 04:58, Viresh Kumar wrote: >>>> On 25-06-19, 13:32, Daniel Lezcano wrote: >>>>> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c >>>>> index aee024e42618..f07454249fbc 100644 >>>>> --- a/drivers/cpufreq/cpufreq.c >>>>> +++ b/drivers/cpufreq/cpufreq.c >>>>> @@ -1379,8 +1379,8 @@ static int cpufreq_online(unsigned int cpu) >>>>> cpufreq_driver->ready(policy); >>>>> >>>>> if (cpufreq_thermal_control_enabled(cpufreq_driver)) >>>>> - policy->cdev = of_cpufreq_cooling_register(policy); >>>>> - >>>>> + of_cpufreq_cooling_register(policy); >>>>> + >>>> >>>> We don't need any error checking here anymore ? >>> >>> There was no error checking initially. This comment and the others below >>> are for an additional patch IMO, not a change in this one. >> >> right, but ... >> >>>>> -void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) >>>>> +void cpufreq_cooling_unregister(struct cpufreq_policy *policy) >>>>> { >>>>> struct cpufreq_cooling_device *cpufreq_cdev; >>>>> bool last; >>>>> >>>>> - if (!cdev) >>>>> - return; >> >> we used to return without any errors from here. Now we will have >> problems if regsitering fails for some reason. > > Specifically, the last cpufreq_cdev in the list will be unregistered > AFAICS, and without removing it from the list for that matter, which > isn't what the caller wants. Indeed, What about the resulting code above: void __cpufreq_cooling_unregister(struct cpufreq_cooling_device *cpufreq_cdev, int last) { /* Unregister the notifier for the last cpufreq cooling device */ if (last) cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block, CPUFREQ_POLICY_NOTIFIER); thermal_cooling_device_unregister(cpufreq_cdev->cdev); ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); kfree(cpufreq_cdev->idle_time); kfree(cpufreq_cdev); } /** * cpufreq_cooling_unregister - function to remove cpufreq cooling device. * @cdev: thermal cooling device pointer. * * This interface function unregisters the "thermal-cpufreq-%x" cooling device. */ void cpufreq_cooling_unregister(struct cpufreq_policy *policy) { struct cpufreq_cooling_device *cpufreq_cdev; bool last; mutex_lock(&cooling_list_lock); list_for_each_entry(cpufreq_cdev, &cpufreq_cdev_list, node) { if (cpufreq_cdev->policy == policy) { list_del(&cpufreq_cdev->node); last = list_empty(&cpufreq_cdev_list); break; } } mutex_unlock(&cooling_list_lock); if (cpufreq_cdev->policy == policy) __cpufreq_cooling_unregister(cpufreq_cdev, last); } EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister); -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog