linux-kernel - [PATCH] cpufreq/scpi: fix handling return value of topology_physical_package

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Date:	Wed, 23 Dec 2015 11:37:18 +0100
From:	Andrzej Hajda <a.hajda@...sung.com>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	Andrzej Hajda <a.hajda@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-arm-kernel@...ts.infradead.org (open list:SYSTEM CONTROL & POWER
	INTERFACE (SCPI) Message...),
	linux-pm@...r.kernel.org (open list:CPU FREQUENCY DRIVERS),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] cpufreq/scpi: fix handling return value of
 topology_physical_package_id

The function can return negative values, so its result should
be assigned to signed variable.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2038576

Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
---
 drivers/cpufreq/scpi-cpufreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/scpi-cpufreq.c b/drivers/cpufreq/scpi-cpufreq.c
index 2c3b16f..de5e89b 100644
--- a/drivers/cpufreq/scpi-cpufreq.c
+++ b/drivers/cpufreq/scpi-cpufreq.c
@@ -31,7 +31,7 @@ static struct scpi_ops *scpi_ops;
 
 static struct scpi_dvfs_info *scpi_get_dvfs_info(struct device *cpu_dev)
 {
-	u8 domain = topology_physical_package_id(cpu_dev->id);
+	int domain = topology_physical_package_id(cpu_dev->id);
 
 	if (domain < 0)
 		return ERR_PTR(-EINVAL);
-- 
1.9.1

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