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Mon, 31 Aug 2026 21:50:10 -0700 (PDT) Date: Tue, 1 Sep 2026 10:20:07 +0530 From: Viresh Kumar To: Zhongqiu Han Cc: Runyu Xiao , rafael@kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, jianhao.xu@seu.edu.cn, stable@vger.kernel.org Subject: Re: [PATCH] cpufreq: initialize policy rwsem before sysfs publication Message-ID: References: <20260830155301.2713780-1-runyu.xiao@seu.edu.cn> <83f87db8-fa13-41d0-ae52-544d22e228e6@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <83f87db8-fa13-41d0-ae52-544d22e228e6@oss.qualcomm.com> On 31-08-26, 20:13, Zhongqiu Han wrote: > On 8/30/2026 11:53 PM, Runyu Xiao wrote: > > cpufreq_policy_alloc() initializes policy->rwsem after > > kobject_init_and_add() has created the policy sysfs directory and its > > default attributes. A sysfs access can therefore reach a policy callback > > before the semaphore has been initialized. > > > > Initialize policy->rwsem before publishing the policy kobject so sysfs > > callbacks always see an initialized semaphore. > > > > Fixes: ad7722dab729 ("cpufreq: create per policy rwsem instead of per CPU cpu_policy_rwsem") > > The tag should be 2fc3384dc75b ("cpufreq: Initialize policy->kobj while > allocating policy"). Right. -- viresh