5.4-stable review patch. If anyone has any objections, please let me know.
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From: Lifeng Zheng zhenglifeng1@huawei.com
[ Upstream commit d1378d1d7edb3a4c4935a44fe834ae135be03564 ]
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: 67d874c3b2c6 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/cpufreq/cpufreq.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 2a2fea6743aa..00f12d23077c 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1220,6 +1220,8 @@ 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; @@ -1242,7 +1244,6 @@ 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);