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Subject[PATCH 02/14] thermal: exynos: Propagate error value from tmu_read()
Date
From: Marek Szyprowski <m.szyprowski@samsung.com>

tmu_read() in case of Exynos4210 might return error for out of bound
values. Current code ignores such value, what leads to reporting critical
temperature value. Add proper error code propagation to exynos_get_temp()
function.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
CC: stable@vger.kernel.org # v4.6+
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
drivers/thermal/samsung/exynos_tmu.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index 986cbd0..ac83f72 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -892,6 +892,7 @@ static void exynos7_tmu_control(struct platform_device *pdev, bool on)
static int exynos_get_temp(void *p, int *temp)
{
struct exynos_tmu_data *data = p;
+ int value, ret = 0;

if (!data || !data->tmu_read || !data->enabled)
return -EINVAL;
@@ -899,12 +900,16 @@ static int exynos_get_temp(void *p, int *temp)
mutex_lock(&data->lock);
clk_enable(data->clk);

- *temp = code_to_temp(data, data->tmu_read(data)) * MCELSIUS;
+ value = data->tmu_read(data);
+ if (value < 0)
+ ret = value;
+ else
+ *temp = code_to_temp(data, value) * MCELSIUS;

clk_disable(data->clk);
mutex_unlock(&data->lock);

- return 0;
+ return ret;
}

#ifdef CONFIG_THERMAL_EMULATION
--
1.9.1
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