cpufreq: exynos5440: protect call to dev_pm_opp_get_opp_count with RCU lock

Commit Message

Dmitry Torokhov Dec. 16, 2014, 1:01 a.m. UTC

dev_pm_opp_get_opp_count() must be called with RCU lock held.

Signed-off-by: Dmitry Torokhov <[e-mail]>
---

Again, not tested...


 drivers/cpufreq/exynos5440-cpufreq.c | 4 ++++
 1 file changed, 4 insertions(+)

Patch

diff --git a/drivers/cpufreq/exynos5440-cpufreq.c b/drivers/cpufreq/exynos5440-cpufreq.c
index 21a90ed..588b9ee 100644
--- a/drivers/cpufreq/exynos5440-cpufreq.c
+++ b/drivers/cpufreq/exynos5440-cpufreq.c
@@ -373,7 +373,11 @@  static int exynos_cpufreq_probe(struct platform_device *pdev)
 			"failed to init cpufreq table: %d\n", ret);
 		goto err_free_opp;
 	}
+
+	rcu_read_lock();
 	dvfs_info->freq_count = dev_pm_opp_get_opp_count(dvfs_info->dev);
+	rcu_read_unlock();
+
 	exynos_sort_descend_freq_table();
 
 	if (of_property_read_u32(np, "clock-latency", &dvfs_info->latency))