[CPUFREQ] [2/2] demand load governor modules.

Demand-load cpufreq governor modules if needed.

Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Dave Jones <davej@redhat.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 9b416372a8e4..b3df613ae4ec 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -321,6 +321,23 @@ static int cpufreq_parse_governor (char *str_governor, unsigned int *policy,
 
                 t = __find_governor(str_governor);
 
+                if (t == NULL) {
+                        char *name = kasprintf(GFP_KERNEL, "cpufreq_%s", str_governor);
+
+                        if (name) {
+                                int ret;
+
+                                mutex_unlock(&cpufreq_governor_mutex);
+                                ret = request_module(name);
+                                mutex_lock(&cpufreq_governor_mutex);
+
+                                if (ret == 0)
+                                        t = __find_governor(str_governor);
+                        }
+
+                        kfree(name);
+                }
+
                 if (t != NULL) {
                         *governor = t;
                         err = 0;