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From dafae9c5b39e2871bfd8db0b4bad6e850e42ef49 Mon Sep 17 00:00:00 2001
From: Georgi Djakov <georgi.djakov@linaro.org>
Date: Wed, 13 Jan 2016 15:10:25 +0200
Subject: cpufreq-dt: Add missing rcu_read_lock() for find_device_opp()
The function dev_pm_opp_get_notifier() must be called with held
rcu_read_lock. In order to keep the pointer valid, add rcu_read_lock().
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
---
drivers/cpufreq/cpufreq-dt.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -359,14 +359,17 @@ static int cpufreq_init(struct cpufreq_p
mutex_init(&priv->lock);
+ rcu_read_lock();
opp_srcu_head = dev_pm_opp_get_notifier(cpu_dev);
if (IS_ERR(opp_srcu_head)) {
ret = PTR_ERR(opp_srcu_head);
+ rcu_read_unlock();
goto out_free_priv;
}
priv->opp_nb.notifier_call = opp_notifier;
ret = srcu_notifier_chain_register(opp_srcu_head, &priv->opp_nb);
+ rcu_read_unlock();
if (ret)
goto out_free_priv;
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