From: Chen Liang <cl@rock-chips.com>
Date: Thu, 7 Jul 2016 03:41:29 +0000 (+0800)
Subject: ARM64: sched: cpufreq_sched: fix bug: init data before use it in thread
X-Git-Tag: firefly_0821_release~2197
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=firefly-linux-kernel-4.4.55.git;a=commitdiff_plain;h=0ac5bfd6d9652d477387764a11e3b48f1afe6891;ds=inline

ARM64: sched: cpufreq_sched: fix bug: init data before use it in thread

policy->governor_data will be use in cpufreq_sched_thread, but it is init
after wake thread, it will cause NULL point access.

Change-Id: I320a3da34560e49f293211be92cb8310d8e395d7
Signed-off-by: Chen Liang <cl@rock-chips.com>
---

diff --git a/kernel/sched/cpufreq_sched.c b/kernel/sched/cpufreq_sched.c
index c608a9265d6a..48053393dc72 100644
--- a/kernel/sched/cpufreq_sched.c
+++ b/kernel/sched/cpufreq_sched.c
@@ -265,6 +265,8 @@ static int cpufreq_sched_policy_init(struct cpufreq_policy *policy)
 	pr_debug("%s: throttle threshold = %u [ns]\n",
 		  __func__, gd->throttle_nsec);
 
+	policy->governor_data = gd;
+
 	if (cpufreq_driver_is_slow()) {
 		cpufreq_driver_slow = true;
 		gd->task = kthread_create(cpufreq_sched_thread, policy,
@@ -281,7 +283,6 @@ static int cpufreq_sched_policy_init(struct cpufreq_policy *policy)
 		init_irq_work(&gd->irq_work, cpufreq_sched_irq_work);
 	}
 
-	policy->governor_data = gd;
 	set_sched_freq();
 
 	return 0;