linux-kernel - [PATCH v2] PM: EM: Fix wrong return value in mtk_cpufreq_get_cpu

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Message-ID: <20241104113615.1397410-1-ruanjinjie@huawei.com>
Date: Mon, 4 Nov 2024 19:36:15 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <rafael@...nel.org>, <viresh.kumar@...aro.org>, <matthias.bgg@...il.com>,
	<angelogioacchino.delregno@...labora.com>, <hector.yuan@...iatek.com>,
	<lukasz.luba@....com>, <qperret@...gle.com>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>
CC: <ruanjinjie@...wei.com>
Subject: [PATCH v2] PM: EM: Fix wrong return value in mtk_cpufreq_get_cpu_power()

mtk_cpufreq_get_cpu_power() return 0 if the policy is NULL. Then in
em_create_perf_table(), the later zero check for power is not invalid
as power is uninitialized. As Lukasz suggested, it must return -EINVAL when
the 'policy' is not found. So return -EINVAL to fix it.

Cc: stable@...r.kernel.org
Fixes: 4855e26bcf4d ("cpufreq: mediatek-hw: Add support for CPUFREQ HW")
Suggested-by: Lukasz Luba <lukasz.luba@....com>
Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
---
v2:
- Fix the driver instead of em_create_perf_table() as suggested.
- Update the commit message.
- Add Suggested-by.
---
 drivers/cpufreq/mediatek-cpufreq-hw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/mediatek-cpufreq-hw.c b/drivers/cpufreq/mediatek-cpufreq-hw.c
index 8925e096d5b9..aeb5e6304542 100644
--- a/drivers/cpufreq/mediatek-cpufreq-hw.c
+++ b/drivers/cpufreq/mediatek-cpufreq-hw.c
@@ -62,7 +62,7 @@ mtk_cpufreq_get_cpu_power(struct device *cpu_dev, unsigned long *uW,
 
 	policy = cpufreq_cpu_get_raw(cpu_dev->id);
 	if (!policy)
-		return 0;
+		return -EINVAL;
 
 	data = policy->driver_data;
 
-- 
2.34.1