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Sun, 30 Aug 2026 22:29:11 -0700 (PDT) Date: Mon, 31 Aug 2026 10:59:08 +0530 From: Viresh Kumar To: Runyu Xiao Cc: 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> Precedence: bulk X-Mailing-List: linux-kernel@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: <20260830155301.2713780-1-runyu.xiao@seu.edu.cn> On 30-08-26, 23:53, 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") > Cc: stable@vger.kernel.org > Assisted-by: Codex:GPT-5 > Signed-off-by: Runyu Xiao > --- > drivers/cpufreq/cpufreq.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) Acked-by: Viresh Kumar -- viresh