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Code Issues Releases Wiki Activity

cpufreq: Init policy->rwsem before it may be possibly used

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In cpufreq_policy_put_kobj(), policy->rwsem is used. But in
cpufreq_policy_alloc(), if freq_qos_add_notifier() returns an error, error
path via err_kobj_remove or err_min_qos_notifier will be reached and
cpufreq_policy_put_kobj() will be called before policy->rwsem is
initialized. Thus, the calling of init_rwsem() should be moved to where
before these two error paths can be reached.

Fixes: 67d874c3b2 ("cpufreq: Register notifiers with the PM QoS framework")
Signed-off-by: Lifeng Zheng <zhenglifeng1@huawei.com>
Link: https://patch.msgid.link/20250709104145.2348017-3-zhenglifeng1@huawei.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lifeng Zheng 2025-07-09 18:41:43 +08:00 committed by Rafael J. Wysocki
parent 2a6c727387
commit d1378d1d7e
1 changed files with 2 additions and 1 deletions
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3
drivers/cpufreq/cpufreq.c
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@ -1281,6 +1281,8 @@ 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;
@ -1303,7 +1305,6 @@ static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
}
INIT_LIST_HEAD(&policy->policy_list);
init_rwsem(&policy->rwsem);
spin_lock_init(&policy->transition_lock);
init_waitqueue_head(&policy->transition_wait);
INIT_WORK(&policy->update, handle_update);