thermal/drivers/exynos: Fix NULL pointer dereference when getting the critical temp

The driver is assuming the get_critical temperature exists as it is
inherited by the thermal of ops. But this one has been removed in
favor of the generic one.

Use the generic thermal_zone_get_crit_temp() function instead

Fixes: 13bea86623be ("thermal/of: Remove of_thermal_get_crit_temp(")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index 5a1ffe2..37465af 100644 (file)
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -264,9 +264,8 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
        unsigned int status;
        int ret = 0, temp;
 
-       if (data->soc != SOC_ARCH_EXYNOS5433) /* FIXME */
-               ret = tzd->ops->get_crit_temp(tzd, &temp);
-       if (ret) {
+       ret = thermal_zone_get_crit_temp(tzd, &temp);
+       if (ret && data->soc != SOC_ARCH_EXYNOS5433) { /* FIXME */
                dev_err(&pdev->dev,
                        "No CRITICAL trip point defined in device tree!\n");
                goto out;