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>

1 files changed, 3 insertions, 0 deletions

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;
 }