From: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Date: Fri, 27 Mar 2015 12:10:06 +0000 (+0100)
Subject: ARM: EXYNOS: Handle of of_iomap() failure
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=ef2156cf4be33e099637c753ab46c5b76e15b167;p=deliverable%2Flinux.git

ARM: EXYNOS: Handle of of_iomap() failure

Prevent possible NULL pointer dereference if of_iomap() fails.
Handle the error by skipping such power domain.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
---

diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
index a9686535f9ed..b15f8663f9fc 100644
--- a/arch/arm/mach-exynos/pm_domains.c
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -138,6 +138,14 @@ static __init int exynos4_pm_init_power_domain(void)
 		pd->pd.name = kstrdup(dev_name(dev), GFP_KERNEL);
 		pd->name = pd->pd.name;
 		pd->base = of_iomap(np, 0);
+		if (!pd->base) {
+			dev_warn(&pdev->dev, "Failed to map memory\n");
+			kfree(pd->pd.name);
+			kfree(pd);
+			of_node_put(np);
+			continue;
+		}
+
 		pd->pd.power_off = exynos_pd_power_off;
 		pd->pd.power_on = exynos_pd_power_on;