4.9-stable review patch. If anyone has any objections, please let me know.
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From: Krzysztof Kozlowski krzk@kernel.org
[ Upstream commit cd4806911cee3901bc2b5eb95603cf1958720b57 ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm/mach-exynos/suspend.c | 1 + 1 file changed, 1 insertion(+)
--- a/arch/arm/mach-exynos/suspend.c +++ b/arch/arm/mach-exynos/suspend.c @@ -252,6 +252,7 @@ static int __init exynos_pmu_irq_init(st NULL); if (!domain) { iounmap(pmu_base_addr); + pmu_base_addr = NULL; return -ENOMEM; }