3.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> commit ca489c58ef0b81cc9c9252fd92e6c9bb38d3c408 upstream. 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: adc548d77c22 ("ARM: EXYNOS: Use MCPM call-backs to support S2R on exynos5420") Reported-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> Reviewed-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> Signed-off-by: Kukjin Kim <kgene@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/arm/mach-exynos/platsmp.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/arch/arm/mach-exynos/platsmp.c +++ b/arch/arm/mach-exynos/platsmp.c @@ -126,8 +126,7 @@ static inline void platform_do_lowpower( */ void exynos_cpu_power_down(int cpu) { - if (cpu == 0 && (of_machine_is_compatible("samsung,exynos5420") || - of_machine_is_compatible("samsung,exynos5800"))) { + if (cpu == 0 && (soc_is_exynos5420() || soc_is_exynos5800())) { /* * Bypass power down for CPU0 during suspend. Check for * the SYS_PWR_REG value to decide if we are suspending -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html