From: Peter De Schrijver <pdeschrijver@nvidia.com>
Date: Tue, 11 Sep 2012 14:27:51 +0000 (+0300)
Subject: cpuquiet: balanced governor requires cpufreq
X-Git-Tag: firefly_0821_release~4158^2~37
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3f8266883879350a90e045012aec78c49665f798;p=firefly-linux-kernel-4.4.55.git

cpuquiet: balanced governor requires cpufreq

The balanced governor relies on cpufreq for some of its decisions. Fail
initialization if there are no cpufreq OPP tables available.

Change-Id: I5d64215d56f50d5df52c1433208b1eb40440c812
Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Reviewed-on: http://git-master/r/131437
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Peter Boonstoppel <pboonstoppel@nvidia.com>
Reviewed-by: Juha Tukkinen <jtukkinen@nvidia.com>

Rebase-Id: R03bb471218a088a816a67232861759cba2b91f38
---

diff --git a/drivers/cpuquiet/governors/balanced.c b/drivers/cpuquiet/governors/balanced.c
index 86a012a5ace5..f187206ef1c4 100644
--- a/drivers/cpuquiet/governors/balanced.c
+++ b/drivers/cpuquiet/governors/balanced.c
@@ -511,8 +511,14 @@ static int balanced_start(void)
 	down_delay = msecs_to_jiffies(2000);
 
 	table = cpufreq_frequency_get_table(0);
+	if (!table)
+		return -EINVAL;
+
 	for (count = 0; table[count].frequency != CPUFREQ_TABLE_END; count++);
 
+	if (count < 4)
+		return -EINVAL;
+
 	idle_top_freq = table[(count / 2) - 1].frequency;
 	idle_bottom_freq = table[(count / 2) - 2].frequency;