openwrt/target/linux/mediatek/patches-5.15/350-12-cpufreq-mediatek-Fix-potential-deadlock-problem-in-m.patch

From 6a1bd7cf4ed7a1948f564aaf16d34b7352c0029b Mon Sep 17 00:00:00 2001
From: Wan Jiabing <wanjiabing@vivo.com>
Date: Tue, 10 May 2022 17:05:31 +0800
Subject: [PATCH 12/21] cpufreq: mediatek: Fix potential deadlock problem in
 mtk_cpufreq_set_target

Fix following coccichek error:
./drivers/cpufreq/mediatek-cpufreq.c:199:2-8: preceding lock on line
./drivers/cpufreq/mediatek-cpufreq.c:208:2-8: preceding lock on line

mutex_lock is acquired but not released before return.
Use 'goto out' to help releasing the mutex_lock.

Fixes: c210063b40ac ("cpufreq: mediatek: Add opp notification support")
Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/cpufreq/mediatek-cpufreq.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/cpufreq/mediatek-cpufreq.c
+++ b/drivers/cpufreq/mediatek-cpufreq.c
@@ -196,7 +196,8 @@ static int mtk_cpufreq_set_target(struct
 
 	if (pre_vproc < 0) {
 		dev_err(cpu_dev, "invalid Vproc value: %d\n", pre_vproc);
-		return pre_vproc;
+		ret = pre_vproc;
+		goto out;
 	}
 
 	freq_hz = freq_table[index].frequency * 1000;
@@ -205,7 +206,8 @@ static int mtk_cpufreq_set_target(struct
 	if (IS_ERR(opp)) {
 		dev_err(cpu_dev, "cpu%d: failed to find OPP for %ld\n",
 			policy->cpu, freq_hz);
-		return PTR_ERR(opp);
+		ret = PTR_ERR(opp);
+		goto out;
 	}
 	vproc = dev_pm_opp_get_voltage(opp);
 	dev_pm_opp_put(opp);