ARM: EXYNOS: Fix potential NULL pointer access in exynos_sys_powerdown_conf

If no platform devices binded to the driver but driver itself loaded and
exynos_sys_powerdown_conf is called from
arch/arm/mach-exynos/{suspend.c, pm.c} it will result in NULL pointer access,
to prevent this added check on pmu_context for NULL.

Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

diff --git a/arch/arm/mach-exynos/pmu.c b/arch/arm/mach-exynos/pmu.c
index de68938ee6aa89a070c910c6de1cf1f5035cf0a4..c21e41dad19c14a66b83bcee65af4b504d8172c7 100644 (file)
--- a/arch/arm/mach-exynos/pmu.c
+++ b/arch/arm/mach-exynos/pmu.c
@@ -748,8 +748,12 @@ static void exynos5_powerdown_conf(enum sys_powerdown mode)
 void exynos_sys_powerdown_conf(enum sys_powerdown mode)
 {
        unsigned int i;
+       const struct exynos_pmu_data *pmu_data;
+
+       if (!pmu_context)
+               return;
 
-       const struct exynos_pmu_data *pmu_data = pmu_context->pmu_data;
+       pmu_data = pmu_context->pmu_data;
 
        if (pmu_data->powerdown_conf)
                pmu_data->powerdown_conf(mode);