[PATCH] ARM: sharpsl_param: Fix hang on boot in sharpsl_save_param().

[dromede at gmail.com]

From: Marko Katic <dromede.gmail.com>

Devices that call sharpsl_save_param() will hang on boot due to
a memcpy call that uses a physical address that is no longer
accessible. This is caused by the following commit:

commit 72662e01088394577be4a3f14da94cf87bea2591
Author: Will Deacon <will.deacon at arm.com>
Date:   Wed Nov 23 12:03:27 2011 +0000

    ARM: head.S: only include __turn_mmu_on in the initial identity mapping

I suspect that due to the abovementioned commit the mmu gets turned on earlier
and thus, memcpy in sharpsl_save_param() will fail.

Fix this by converting the physical address into a virtual one.

Signed-off-by: Marko Katic <dromede at gmail.com>
---
 arch/arm/common/sharpsl_param.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/common/sharpsl_param.c b/arch/arm/common/sharpsl_param.c
index d56c932..04555dc 100644
--- a/arch/arm/common/sharpsl_param.c
+++ b/arch/arm/common/sharpsl_param.c
@@ -14,6 +14,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/string.h>
+#include <asm/memory.h>
 #include <asm/mach/sharpsl_param.h>
 
 /*
@@ -41,7 +42,8 @@ EXPORT_SYMBOL(sharpsl_param);
 
 void sharpsl_save_param(void)
 {
-	memcpy(&sharpsl_param, (void *)PARAM_BASE, sizeof(struct sharpsl_param_info));
+	void *param_start = phys_to_virt(PARAM_BASE);
+	memcpy(&sharpsl_param, param_start, sizeof(struct sharpsl_param_info));
 
 	if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
 		sharpsl_param.comadj=-1;
-- 
1.7.10.4