From: Amit Daniel Kachhap <amit.daniel@samsung.com>
Date: Sun, 21 Apr 2013 22:24:37 +0000 (+0200)
Subject: cpufreq: exynos5440: Protect OPP search calls with RCU lock
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=70eb0855b2f8fcf61f9f47626b9fa70e7b45ab06;p=openwrt%2Fstaging%2Fblogic.git

cpufreq: exynos5440: Protect OPP search calls with RCU lock

As per the OPP library documentation(Documentation/power/opp.txt) all
OPP find/get calls should be protected by RCU locks.

Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/drivers/cpufreq/exynos5440-cpufreq.c b/drivers/cpufreq/exynos5440-cpufreq.c
index ead7ed43e238..0c74018eda47 100644
--- a/drivers/cpufreq/exynos5440-cpufreq.c
+++ b/drivers/cpufreq/exynos5440-cpufreq.c
@@ -120,11 +120,13 @@ static int init_div_table(void)
 	int i = 0;
 	struct opp *opp;
 
+	rcu_read_lock();
 	for (i = 0; freq_tbl[i].frequency != CPUFREQ_TABLE_END; i++) {
 
 		opp = opp_find_freq_exact(dvfs_info->dev,
 					freq_tbl[i].frequency * 1000, true);
 		if (IS_ERR(opp)) {
+			rcu_read_unlock();
 			dev_err(dvfs_info->dev,
 				"failed to find valid OPP for %u KHZ\n",
 				freq_tbl[i].frequency);
@@ -159,6 +161,7 @@ static int init_div_table(void)
 		__raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 * i);
 	}
 
+	rcu_read_unlock();
 	return 0;
 }