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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 A8736C83018 for ; Wed, 2 Dec 2020 11:54:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5149620DD4 for ; Wed, 2 Dec 2020 11:54:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388661AbgLBLyw (ORCPT ); Wed, 2 Dec 2020 06:54:52 -0500 Received: from foss.arm.com ([217.140.110.172]:37270 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388232AbgLBLyu (ORCPT ); Wed, 2 Dec 2020 06:54:50 -0500 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 CE750101E; Wed, 2 Dec 2020 03:54:04 -0800 (PST) Received: from [10.57.0.85] (unknown [10.57.0.85]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EAEFA3F718; Wed, 2 Dec 2020 03:54:01 -0800 (PST) Subject: Re: [PATCH v2 3/5] thermal: devfreq_cooling: add new registration functions with Energy Model To: Ionela Voinescu Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, dri-devel@lists.freedesktop.org, rui.zhang@intel.com, amit.kucheria@verdurent.com, daniel.lezcano@linaro.org, orjan.eide@arm.com, robh@kernel.org, alyssa.rosenzweig@collabora.com, steven.price@arm.com, airlied@linux.ie, daniel@ffwll.ch References: <20201118120358.17150-1-lukasz.luba@arm.com> <20201118120358.17150-4-lukasz.luba@arm.com> <20201202102439.GA1639@arm.com> <20201202114909.GA1198@arm.com> From: Lukasz Luba Message-ID: Date: Wed, 2 Dec 2020 11:54:00 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20201202114909.GA1198@arm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/2/20 11:49 AM, Ionela Voinescu wrote: > On Wednesday 02 Dec 2020 at 11:14:02 (+0000), Lukasz Luba wrote: >> Hi Ionela, >> >> On 12/2/20 10:24 AM, Ionela Voinescu wrote: >>> Hi Lukasz, >>> >>> On Wednesday 18 Nov 2020 at 12:03:56 (+0000), Lukasz Luba wrote: >> >> [snip] >> >>>> + struct device_node *np = NULL; >> >> [snip] >> >>>> + >>>> + if (dev->of_node) >>>> + np = of_node_get(dev->of_node); >>>> + >>> >>> Should np be checked before use? I'm not sure if it's better to do the >>> assign first and then the check on np before use. It depends on the >>> consequences of passing a NULL node pointer later on. >> >> The np is actually dev->of_node (or left NULL, as set at the begging). >> The only meaning of the line above is to increment the counter and then >> decrement if CONFIG_OF_DYNAMIC was used. >> The devfreq_cooling_register() has np = NULL and the registration can >> handle it, so we should be OK here as well. >> > > Yes, I just wanted to make sure later registration can handle np = NULL, > or whether we need to bail out. > > In this case, you can drop both ifs - for (dev->of_node) before get and > for np before put below, as of_node_get/of_node_put can handle NULL > pointers themselves. Right. I agree, I will resend this patch with that small change. Thank you for having a look at it. Lukasz > > Thanks, > Ionela. > 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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 21F72C63777 for ; Thu, 3 Dec 2020 08:14:54 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9A73720C56 for ; Thu, 3 Dec 2020 08:14:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9A73720C56 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 007AB6E098; Thu, 3 Dec 2020 08:14:42 +0000 (UTC) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by gabe.freedesktop.org (Postfix) with ESMTP id 20CD36EA24 for ; Wed, 2 Dec 2020 11:54:05 +0000 (UTC) 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 CE750101E; Wed, 2 Dec 2020 03:54:04 -0800 (PST) Received: from [10.57.0.85] (unknown [10.57.0.85]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EAEFA3F718; Wed, 2 Dec 2020 03:54:01 -0800 (PST) Subject: Re: [PATCH v2 3/5] thermal: devfreq_cooling: add new registration functions with Energy Model To: Ionela Voinescu References: <20201118120358.17150-1-lukasz.luba@arm.com> <20201118120358.17150-4-lukasz.luba@arm.com> <20201202102439.GA1639@arm.com> <20201202114909.GA1198@arm.com> From: Lukasz Luba Message-ID: Date: Wed, 2 Dec 2020 11:54:00 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20201202114909.GA1198@arm.com> Content-Language: en-US X-Mailman-Approved-At: Thu, 03 Dec 2020 08:14:41 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: amit.kucheria@verdurent.com, linux-pm@vger.kernel.org, airlied@linux.ie, daniel.lezcano@linaro.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, steven.price@arm.com, alyssa.rosenzweig@collabora.com, rui.zhang@intel.com, orjan.eide@arm.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On 12/2/20 11:49 AM, Ionela Voinescu wrote: > On Wednesday 02 Dec 2020 at 11:14:02 (+0000), Lukasz Luba wrote: >> Hi Ionela, >> >> On 12/2/20 10:24 AM, Ionela Voinescu wrote: >>> Hi Lukasz, >>> >>> On Wednesday 18 Nov 2020 at 12:03:56 (+0000), Lukasz Luba wrote: >> >> [snip] >> >>>> + struct device_node *np = NULL; >> >> [snip] >> >>>> + >>>> + if (dev->of_node) >>>> + np = of_node_get(dev->of_node); >>>> + >>> >>> Should np be checked before use? I'm not sure if it's better to do the >>> assign first and then the check on np before use. It depends on the >>> consequences of passing a NULL node pointer later on. >> >> The np is actually dev->of_node (or left NULL, as set at the begging). >> The only meaning of the line above is to increment the counter and then >> decrement if CONFIG_OF_DYNAMIC was used. >> The devfreq_cooling_register() has np = NULL and the registration can >> handle it, so we should be OK here as well. >> > > Yes, I just wanted to make sure later registration can handle np = NULL, > or whether we need to bail out. > > In this case, you can drop both ifs - for (dev->of_node) before get and > for np before put below, as of_node_get/of_node_put can handle NULL > pointers themselves. Right. I agree, I will resend this patch with that small change. Thank you for having a look at it. Lukasz > > Thanks, > Ionela. > _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel