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ARM: EXYNOS: Don't use LDREX and STREX after disabling cache coherency
During CPU shutdown the exynos_cpu_power_down() is called after
disabling cache coherency and it uses LDREX and STREX instructions (by
calling of_machine_is_compatible() -> kobject_get() -> kref_get()).
The LDREX and STREX should not be used after disabling the cache
coherency so just use soc_is_exynos().
Fixes: adc548d77c
("ARM: EXYNOS: Use MCPM call-backs to support S2R
on exynos5420")
Reported-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
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@ -126,8 +126,7 @@ static inline void platform_do_lowpower(unsigned int cpu, int *spurious)
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*/
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void exynos_cpu_power_down(int cpu)
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{
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if (cpu == 0 && (of_machine_is_compatible("samsung,exynos5420") ||
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of_machine_is_compatible("samsung,exynos5800"))) {
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if (cpu == 0 && (soc_is_exynos5420() || soc_is_exynos5800())) {
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/*
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* Bypass power down for CPU0 during suspend. Check for
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* the SYS_PWR_REG value to decide if we are suspending
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