This is a note to let you know that I've just added the patch titled
ARM: EXYNOS: Don't use LDREX and STREX after disabling cache coherency
to the 3.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-exynos-don-t-use-ldrex-and-strex-after-disabling-cache-coherency.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ca489c58ef0b81cc9c9252fd92e6c9bb38d3c408 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Date: Fri, 27 Feb 2015 05:50:41 +0900
Subject: ARM: EXYNOS: Don't use LDREX and STREX after disabling cache coherency
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
Patches currently in stable-queue which might be from k.kozlowski@xxxxxxxxxxx are
queue-3.19/arm-exynos-don-t-use-ldrex-and-strex-after-disabling-cache-coherency.patch
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