linux-kernel - [PATCH] thermal: exynos: fix handling of invalid frequency table entries

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Date:	Tue,  9 Apr 2013 14:59:18 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <eduardo.valentin@...com>,
	Kukjin Kim <kgene.kim@...sung.com>
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	Andrew Bresticker <abrestic@...omium.org>
Subject: [PATCH] thermal: exynos: fix handling of invalid frequency table entries

Similar to the error described in "thermal: cpu_cooling: fix handling
of invalid frequency table entries," exynos_get_frequency_level() will
enter an infinite loop if any CPU frequency table entries are invalid.
This patch fixes the handling of invalid frequency entries so that
there is no infinite loop and the correct level is returned.

Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
---
 drivers/thermal/exynos_thermal.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/thermal/exynos_thermal.c b/drivers/thermal/exynos_thermal.c
index d5e6267..524b2a0 100644
--- a/drivers/thermal/exynos_thermal.c
+++ b/drivers/thermal/exynos_thermal.c
@@ -237,7 +237,7 @@ static int exynos_get_crit_temp(struct thermal_zone_device *thermal,
 
 static int exynos_get_frequency_level(unsigned int cpu, unsigned int freq)
 {
-	int i = 0, ret = -EINVAL;
+	int i, level = 0, ret = -EINVAL;
 	struct cpufreq_frequency_table *table = NULL;
 #ifdef CONFIG_CPU_FREQ
 	table = cpufreq_frequency_get_table(cpu);
@@ -245,12 +245,12 @@ static int exynos_get_frequency_level(unsigned int cpu, unsigned int freq)
 	if (!table)
 		return ret;
 
-	while (table[i].frequency != CPUFREQ_TABLE_END) {
+	for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
 		if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
 			continue;
 		if (table[i].frequency == freq)
-			return i;
-		i++;
+			return level;
+		level++;
 	}
 	return ret;
 }
-- 
1.8.1.3

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