PM / OPP: Introduce function to free cpufreq table

cpufreq table allocated by opp_init_cpufreq_table is better
freed by OPP layer itself. This allows future modifications to
the table handling to be transparent to the users.

Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

3 files changed, 27 insertions, 0 deletions

diff --git a/Documentation/power/opp.txt b/Documentation/power/opp.txt
index 5ae70a12c1e2..3035d00757ad 100644
--- a/Documentation/power/opp.txt
+++ b/Documentation/power/opp.txt
@@ -321,6 +321,8 @@ opp_init_cpufreq_table - cpufreq framework typically is initialized with
         addition to CONFIG_PM as power management feature is required to
         dynamically scale voltage and frequency in a system.
 
+opp_free_cpufreq_table - Free up the table allocated by opp_init_cpufreq_table
+
 7. Data Structures
 ==================
 Typically an SoC contains multiple voltage domains which are variable. Each
diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index 56a6899f5e9e..5cc12322ef32 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -625,4 +625,21 @@ int opp_init_cpufreq_table(struct device *dev,
 
         return 0;
 }
+
+/**
+ * opp_free_cpufreq_table() - free the cpufreq table
+ * @dev:        device for which we do this operation
+ * @table:      table to free
+ *
+ * Free up the table allocated by opp_init_cpufreq_table
+ */
+void opp_free_cpufreq_table(struct device *dev,
+                                struct cpufreq_frequency_table **table)
+{
+        if (!table)
+                return;
+
+        kfree(*table);
+        *table = NULL;
+}
 #endif          /* CONFIG_CPU_FREQ */
diff --git a/include/linux/opp.h b/include/linux/opp.h
index 5449945d589f..7020e9736fc5 100644
--- a/include/linux/opp.h
+++ b/include/linux/opp.h
@@ -94,12 +94,20 @@ static inline int opp_disable(struct device *dev, unsigned long freq)
 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 int opp_init_cpufreq_table(struct device *dev,
                             struct cpufreq_frequency_table **table);
+void opp_free_cpufreq_table(struct device *dev,
+                                struct cpufreq_frequency_table **table);
 #else
 static inline int opp_init_cpufreq_table(struct device *dev,
                             struct cpufreq_frequency_table **table)
 {
         return -EINVAL;
 }
+
+static inline
+void opp_free_cpufreq_table(struct device *dev,
+                                struct cpufreq_frequency_table **table)
+{
+}
 #endif          /* CONFIG_CPU_FREQ */
 
 #endif          /* __LINUX_OPP_H__ */