From: Huang, Tao <huangtao@rock-chips.com>
Date: Wed, 29 Apr 2015 01:05:09 +0000 (+0800)
Subject: cpufreq: rockchip_big_little: check cpufreq_cpu_get return value
X-Git-Tag: firefly_0821_release~4158^2~158
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d02dc548d4ef64a34e1b96b96057234f66fb886f;p=firefly-linux-kernel-4.4.55.git

cpufreq: rockchip_big_little: check cpufreq_cpu_get return value

fix panic when cpu up/down

Signed-off-by: Huang, Tao <huangtao@rock-chips.com>
---

diff --git a/drivers/cpufreq/rockchip_big_little.c b/drivers/cpufreq/rockchip_big_little.c
index c817d5b11d95..b333837664f9 100644
--- a/drivers/cpufreq/rockchip_big_little.c
+++ b/drivers/cpufreq/rockchip_big_little.c
@@ -196,6 +196,8 @@ static int rockchip_bl_cpufreq_scale_rate_for_dvfs(struct clk *clk,
 
 	cur_cluster = clk_node_get_cluster_id(clk);
 	policy = cpufreq_cpu_get(cluster_policy_cpu[cur_cluster]);
+	if (!policy)
+		return 0;
 
 	freqs.new = rate / 1000;
 	freqs.old = clk_get_rate(clk) / 1000;