linux-kernel - [PATCH] cpufreq: imx6: prorect calls to dev_pm_opp_get_opp

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Date:	Mon, 15 Dec 2014 16:50:48 -0800
From:	Dmitry Torokhov <dtor@...omium.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	Shawn Guo <shawn.guo@...escale.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Anson Huang <b20788@...escale.com>,
	John Tobias <john.tobias.ph@...il.com>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] cpufreq: imx6: prorect calls to dev_pm_opp_get_opp_count
 with RCU lock

dev_pm_opp_get_opp_count() must be called with RCU lock held.

Signed-off-by: Dmitry Torokhov <dtor@...omium.org>
---

Not tested at all...

 drivers/cpufreq/imx6q-cpufreq.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index 380a90d..851d4fd 100644
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -200,7 +200,9 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev)
 	 * Just, incase the platform did not supply the OPP
 	 * table, it will try to get it.
 	 */
+	rcu_read_lock();
 	num = dev_pm_opp_get_opp_count(cpu_dev);
+	rcu_read_unlock();
 	if (num < 0) {
 		ret = of_init_opp_table(cpu_dev);
 		if (ret < 0) {
@@ -211,7 +213,9 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev)
 		/* Because we have added the OPPs here, we must free them */
 		free_opp = true;
 
+		rcu_read_lock();
 		num = dev_pm_opp_get_opp_count(cpu_dev);
+		rcu_read_unlock();
 		if (num < 0) {
 			ret = num;
 			dev_err(cpu_dev, "no OPP table is found: %d\n", ret);
-- 
2.2.0.rc0.207.ga3a616c


-- 
Dmitry
--
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