linux-kernel - [PATCH v2] cpufreq: mediatek: Fix potential deadlock problem in mtk_cpufreq_set

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Date:   Tue, 10 May 2022 17:05:31 +0800
From:   Wan Jiabing <wanjiabing@...o.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rex-BC Chen <rex-bc.chen@...iatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Jia-Wei Chang <jia-wei.chang@...iatek.com>,
        "Andrew-sh.Cheng" <andrew-sh.cheng@...iatek.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Cc:     Wan Jiabing <wanjiabing@...o.com>
Subject: [PATCH v2] 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@...o.com>
---
Changelog:
v2:
- Fix a typo in 'Fixes' tag.
---
 drivers/cpufreq/mediatek-cpufreq.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
index 75bf21ddf61f..4c6d53c99d79 100644
--- a/drivers/cpufreq/mediatek-cpufreq.c
+++ b/drivers/cpufreq/mediatek-cpufreq.c
@@ -196,7 +196,8 @@ static int mtk_cpufreq_set_target(struct cpufreq_policy *policy,
 
 	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 cpufreq_policy *policy,
 	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);
-- 
2.35.1