[PATCH] cpufreq_ondemand: Warn if it cannot run due to too long transition latency

Display a warning if the ondemand governor can not be selected due to a
transition latency of the cpufreq driver which is too long.

Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net>
Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 69aa1db8336c..6430489db6f4 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -395,8 +395,11 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                         return -EINVAL;
 
                 if (policy->cpuinfo.transition_latency >
-                                (TRANSITION_LATENCY_LIMIT * 1000))
+                                (TRANSITION_LATENCY_LIMIT * 1000)) {
+                        printk(KERN_WARNING "ondemand governor failed to load "
+                               "due to too long transition latency\n");
                         return -EINVAL;
+                }
                 if (this_dbs_info->enable) /* Already enabled */
                         break;