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=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 0FA7EC33C99 for ; Tue, 7 Jan 2020 08:01:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D58A32077B for ; Tue, 7 Jan 2020 08:01:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="BlBCC1hi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727589AbgAGIBx (ORCPT ); Tue, 7 Jan 2020 03:01:53 -0500 Received: from mail-pf1-f195.google.com ([209.85.210.195]:38465 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726492AbgAGIBx (ORCPT ); Tue, 7 Jan 2020 03:01:53 -0500 Received: by mail-pf1-f195.google.com with SMTP id x185so28209527pfc.5 for ; Tue, 07 Jan 2020 00:01:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=1umg53pWWYl/6QRnWmVkxLsY3gucZgYzRZz/LWAqWXY=; b=BlBCC1hiGJuDUOHYeGFUhTU+3bqykxr60JA6uoCkj+4HY3eTrNi4NvoLxplc/UKcqU ped4ttm0ekXaCxOUhJMVJvGhGpZoLmklcLuq3MK9lBeUaal74NLtlj5AIxWKbC98uUKX 1hnFr8c8mZISKLpHrBY99PcmiscsjGLsjM2sgayj15VZdXSfqrzTvE3RTdXvurGoB7OS lfGcZKxmJC1dT5gWFdALnMOiqK8vNi1FNLQsc8zNqaeAzYmVmCOW1rnQ88xcK5AWJeGd Cglhy5Il1zp9ZQID4qS8cO7jxEN8f7BesDZn378gxeH+aD37tsUB0NEBbuu091ko3yAH U4hg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=1umg53pWWYl/6QRnWmVkxLsY3gucZgYzRZz/LWAqWXY=; b=iJEWXRyYvDrjvNiwJA9KjMM0pn2om4rnPcbpOU9JkYMQkUqgTepYmtHsdZnoaAmkom GnZvz+5nRWUKu81vEGcNUYgSYL6A8Qfku0jcq19Hmdkn8u4UkbpZ0CqUAAWEzk74WXLo er+s9STdtdlHh07WLuur1eZl3M6v08PvZPd0zaDpUgtVNztCVoRFRXb1uNC8jWjRsl/O oeefhMkRE1MWrMI5YfVgu2YdaRpUXLwO+upjKbQgPm1DSzaZao1NUPG5d3IYrTMgI49o UmsqU30VAZITAQF5rfrU9RafFPZ4YQDx6Ygr/2e9uS23iqwA0R9ge4Zr1JIYWb4aO2uE 0+Zw== X-Gm-Message-State: APjAAAXgvnN8AG7Y9iZrEMiss/d0TsXCANXnwCw45TFax3Y+JZse97CU 3N1f4TCK7UMpR3E0+i6U41lb+Q== X-Google-Smtp-Source: APXvYqxVE2VEnVPb0aAGxiZJ/oIQEyVvSKjAKPvgVOOZNl4CcAjr60FWxaJEKvnLnoSswGARFg69Rg== X-Received: by 2002:a63:5924:: with SMTP id n36mr115765526pgb.43.1578384112408; Tue, 07 Jan 2020 00:01:52 -0800 (PST) Received: from localhost ([122.172.26.121]) by smtp.gmail.com with ESMTPSA id w11sm79495860pfn.4.2020.01.07.00.01.51 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 07 Jan 2020 00:01:51 -0800 (PST) Date: Tue, 7 Jan 2020 13:31:45 +0530 From: Viresh Kumar To: qiwuchen55@gmail.com Cc: kgene@kernel.org, krzk@kernel.org, rjw@rjwysocki.net, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-pm@vger.kernel.org, chenqiwu Subject: Re: [PATCH v3] cpufreq: s3c: fix unbalances of cpufreq policy refcount Message-ID: <20200107080145.7c4gxilnjjxjfqpc@vireshk-i7> References: <1578383599-11207-1-git-send-email-qiwuchen55@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1578383599-11207-1-git-send-email-qiwuchen55@gmail.com> User-Agent: NeoMutt/20180716-391-311a52 Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org On 07-01-20, 15:53, qiwuchen55@gmail.com wrote: > From: chenqiwu > > The cpufreq_reboot_notifier_evt() call cpufreq_cpu_get() to get the > cpufreq policy of cpu0, meanwhile, it also increments the kobject > reference count to mark it busy. However, a corresponding call of > cpufreq_cpu_put() is ignored to decrement the kobject reference count > back, which may lead to a potential stuck risk that the cpuhp thread > deadly waits for dropping of kobject refcount when cpufreq policy free. > > With this patch, the cpuhp thread can be easily exercised by attempting > to force an unbind of the CPUfreq driver. > > Signed-off-by: chenqiwu > --- > changes in v3: > - Rewrite title and commit message. > --- > drivers/cpufreq/s3c2416-cpufreq.c | 12 +++++++++++- > drivers/cpufreq/s5pv210-cpufreq.c | 11 ++++++++++- > 2 files changed, 21 insertions(+), 2 deletions(-) Applied. Thanks. -- viresh