From cd4806911cee3901bc2b5eb95603cf1958720b57 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <krzk@kernel.org>
Date: Tue, 24 Jul 2018 18:48:14 +0200
Subject: [PATCH] ARM: exynos: Clear global variable on init error path
Git-commit: cd4806911cee3901bc2b5eb95603cf1958720b57
Patch-mainline: v4.19-rc1
References: bsc#1051510

For most of Exynos SoCs, Power Management Unit (PMU) address space is
mapped into global variable 'pmu_base_addr' very early when initializing
PMU interrupt controller.  A lot of other machine code depends on it so
when doing iounmap() on this address, clear the global as well to avoid
usage of invalid value (pointing to unmapped memory region).

Properly mapped PMU address space is a requirement for all other machine
code so this fix is purely theoretical.  Boot will fail immediately in
many other places after following this error path.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 arch/arm/mach-exynos/suspend.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-exynos/suspend.c b/arch/arm/mach-exynos/suspend.c
index d3db306a5a70..941b0ffd9806 100644
--- a/arch/arm/mach-exynos/suspend.c
+++ b/arch/arm/mach-exynos/suspend.c
@@ -203,6 +203,7 @@ static int __init exynos_pmu_irq_init(struct device_node *node,
 					  NULL);
 	if (!domain) {
 		iounmap(pmu_base_addr);
+		pmu_base_addr = NULL;
 		return -ENOMEM;
 	}
 
-- 
2.18.0