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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-396d7759bd1sm6750547a91.3.2026.09.01.06.07.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 01 Sep 2026 06:07:40 -0700 (PDT) Message-ID: <36d2a431-a1c3-478e-a001-936d25bcb9e1@oss.qualcomm.com> Date: Tue, 1 Sep 2026 21:07:32 +0800 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] cpufreq: initialize policy rwsem before sysfs publication To: Runyu Xiao , "Rafael J . Wysocki" Cc: Viresh Kumar , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Jianhao Xu , zhongqiu.han@oss.qualcomm.com References: <20260830155301.2713780-1-runyu.xiao@seu.edu.cn> <20260901121950.3279176-1-runyu.xiao@seu.edu.cn> Content-Language: en-US From: Zhongqiu Han In-Reply-To: <20260901121950.3279176-1-runyu.xiao@seu.edu.cn> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYwOTAxMDExNiBTYWx0ZWRfX4tV6/QCXKW6b W5hXtzS/wKAArOsa7JRaJRJQb1ywhFLNvSmghXjTAcoN/g9OENu5e1CD2Ce6gXB7SyZo2l5eZqI 9LYMjy7g2a4iV7lFd4535J1OEt2vkRA= X-Authority-Analysis: v=2.4 cv=R9wz39RX c=1 sm=1 tr=0 ts=6a96ce1e cx=c_pps a=vVfyC5vLCtgYJKYeQD43oA==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=FxTtqrLrjwncoYGlF1wA:9 a=lqcHg5cX4UMA:10 a=QEXdDO2ut3YA:10 a=z2U-W3hJrleVIN9YIjzO:22 a=rl5im9kqc5Lf4LNbBjHf:22 X-Proofpoint-GUID: JyfgCeoaiZAQu8fB93_9milQIonivPwY X-Proofpoint-ORIG-GUID: JyfgCeoaiZAQu8fB93_9milQIonivPwY X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTAxMDExNiBTYWx0ZWRfXwjLNTCjBqaID gj8J2uwyejI62llQGriiAIgTQO3nCy85WIwHESRsW66kj2VirEf5OFXnvMzejjBEWyLusU/P5DW XojysORaTND/g+q31H3LYPIq4rnc6F/ij41BQUL0wr00FujVS+NOyiqbF5f595h04+dtIBADwWV g3CEWMku3YMuK4k+RhhdhpjGqfJB81Lhy3cVl/xhc8JYXyPBpwL3hvkrAimUhvcU+rlK1x25o5E CHaMJfkSjuyalUgohPRVywl7YeTyZt5CIpyuvt/I9SX5WmonbyxozT55co5yxBWbg3opxgPz1km QWltXPjyZNAFt7FdNtXeje/nV6WcshYt6FnI3ITMvAZpftPOi2lqv4wgyXHOfLkeSvmRMC7zQpa PKQ7iZXXoZkrLEFI/GgvkxWjpDKGGnl+/xoxxnp/v9RL0eJnsdH9Fr7D0/bHuQT4cK9J+37Q3/m VEqRmy1Yljn3uTXIWSw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-01_03,2026-08-31_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 clxscore=1015 phishscore=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 impostorscore=0 spamscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609010116 On 9/1/2026 8:19 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: 2fc3384dc75b ("cpufreq: Initialize policy->kobj while allocating policy") > Cc: stable@vger.kernel.org > Link: https://lore.kernel.org/all/20260830155301.2713780-1-runyu.xiao@seu.edu.cn/ Nit: It points to V1 Link, but should be okay according by https:// docs.kernel.org/process/submitting-patches.html#describe-your-changes > Signed-off-by: Runyu Xiao > Assisted-by: Codex:GPT-5 Nit: Sob tag should always be the last tag. Reviewed-by: Zhongqiu Han > > --- > v2: > - Correct the Fixes tag to the commit that introduced policy kobject publication. > --- > drivers/cpufreq/cpufreq.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c > index 0d0df986f..9efbf5b17 100644 > --- a/drivers/cpufreq/cpufreq.c > +++ b/drivers/cpufreq/cpufreq.c > @@ -1258,6 +1258,8 @@ static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu) > if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL)) > goto err_free_rcpumask; > > + init_rwsem(&policy->rwsem); > + > init_completion(&policy->kobj_unregister); > ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, > cpufreq_global_kobject, "policy%u", cpu); > @@ -1272,8 +1274,6 @@ static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu) > goto err_free_real_cpus; > } > > - init_rwsem(&policy->rwsem); > - > freq_constraints_init(&policy->constraints); > > policy->nb_min.notifier_call = cpufreq_notifier_min; -- Thx and BRs, Zhongqiu Han