Kexec disables outer cache before jumping to reboot code, but it doesn't flush it explicitly. Flush is done implicitly inside of l2x0_disable(). But some SoC's override default .disable handler and don't flush cache. This may lead to a corrupted memory during Kexec reboot on these platforms.
This patch adds cache flush inside of OMAP4 and Highbank outer_cache.disable() handlers to make it consistent with default l2x0_disable(). Also it removes redundant outer_flush_all() call just before outer_disable().
Signed-off-by: Taras Kondratiuk taras.kondratiuk@linaro.org --- v2: Make the fix specific to platforms that don't use l2x0_disable(). v1: https://patchwork.kernel.org/patch/2974431/ --- Cc: Will Deacon will.deacon@arm.com Cc: Russell King linux@arm.linux.org.uk Cc: Rob Herring rob.herring@calxeda.com Cc: linaro-kernel@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-omap@vger.kernel.org --- arch/arm/mach-highbank/highbank.c | 1 + arch/arm/mach-highbank/pm.c | 1 - arch/arm/mach-omap2/omap4-common.c | 1 + 3 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-highbank/highbank.c b/arch/arm/mach-highbank/highbank.c index 8e63ccd..22e6f34 100644 --- a/arch/arm/mach-highbank/highbank.c +++ b/arch/arm/mach-highbank/highbank.c @@ -63,6 +63,7 @@ void highbank_set_cpu_jump(int cpu, void *jump_addr)
static void highbank_l2x0_disable(void) { + outer_flush_all(); /* Disable PL310 L2 Cache controller */ highbank_smc1(0x102, 0x0); } diff --git a/arch/arm/mach-highbank/pm.c b/arch/arm/mach-highbank/pm.c index 04eddb4..9a5b8a7 100644 --- a/arch/arm/mach-highbank/pm.c +++ b/arch/arm/mach-highbank/pm.c @@ -28,7 +28,6 @@
static int highbank_suspend_finish(unsigned long val) { - outer_flush_all(); outer_disable();
highbank_set_pwr_suspend(); diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c index 5791143..3f44b16 100644 --- a/arch/arm/mach-omap2/omap4-common.c +++ b/arch/arm/mach-omap2/omap4-common.c @@ -163,6 +163,7 @@ void __iomem *omap4_get_l2cache_base(void)
static void omap4_l2x0_disable(void) { + outer_flush_all(); /* Disable PL310 L2 Cache controller */ omap_smc1(0x102, 0x0); }