[PATCH 4.9 30/36] thermal: exynos: Propagate error value from tmu_read()

From: Greg Kroah-Hartman
Date: Mon May 14 2018 - 02:54:36 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>

commit c8da6cdef57b459ac0fd5d9d348f8460a575ae90 upstream.

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@xxxxxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx # v4.6+
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Signed-off-by: Eduardo Valentin <edubezval@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/thermal/samsung/exynos_tmu.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -892,6 +892,7 @@ static void exynos7_tmu_control(struct p
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
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