From: Krzysztof Kozlowski Date: Thu, 26 Feb 2015 20:50:41 +0000 (+0900) Subject: ARM: EXYNOS: Don't use LDREX and STREX after disabling cache coherency X-Git-Tag: v4.0-rc4~3^2~14^2~1 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ca489c58ef0b81cc9c9252fd92e6c9bb38d3c408;p=karo-tx-linux.git 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: adc548d77c22 ("ARM: EXYNOS: Use MCPM call-backs to support S2R on exynos5420") Reported-by: Stephen Boyd Signed-off-by: Krzysztof Kozlowski Cc: Reviewed-by: Stephen Boyd Signed-off-by: Kukjin Kim --- diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c index 3f32c47a6d74..d2e9f12d12f1 100644 --- a/arch/arm/mach-exynos/platsmp.c +++ b/arch/arm/mach-exynos/platsmp.c @@ -126,8 +126,7 @@ static inline void platform_do_lowpower(unsigned int cpu, int *spurious) */ 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