linux-kernel - [PATCH v4] sharpsl_param.c: ARM: pxa: fix invalid memory access

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Message-Id: <1379709326-2988-1-git-send-email-andrea.adami@gmail.com>
Date:	Fri, 20 Sep 2013 22:35:26 +0200
From:	Andrea Adami <andrea.adami@...il.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	arm@...nel.org, Olof Johansson <olof@...om.net>,
	Marko Katic <dromede@...il.com>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4] sharpsl_param.c: ARM: pxa: fix invalid memory access

After commit 72662e01088394577be4a3f14da94cf87bea2591
ARM: head.S: only include __turn_mmu_on in the initial identity mapping

Zaurus PXA devices call sharpsl_save_param() during fixup and hang on
boot because memcpy refers to physical addresses no longer valid if the
MMU is setup.
Zaurus collie (SA1100) is unaffected (function is called in init_machine).

The code was making assumptions and for PXA the virtual address
should have been used before.

Signed-off-by: Marko Katic <dromede@...il.com>
Signed-off-by: Andrea Adami <andrea.adami@...il.com>
---
 arch/arm/common/sharpsl_param.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm/common/sharpsl_param.c b/arch/arm/common/sharpsl_param.c
index d56c932..3490549 100644
--- a/arch/arm/common/sharpsl_param.c
+++ b/arch/arm/common/sharpsl_param.c
@@ -15,6 +15,7 @@
 #include <linux/module.h>
 #include <linux/string.h>
 #include <asm/mach/sharpsl_param.h>
+#include <asm/memory.h>
 
 /*
  * Certain hardware parameters determined at the time of device manufacture,
@@ -25,8 +26,10 @@
  */
 #ifdef CONFIG_ARCH_SA1100
 #define PARAM_BASE	0xe8ffc000
+#define param_start(x)	(void *)(x)
 #else
 #define PARAM_BASE	0xa0000a00
+#define param_start(x)	__va(x)
 #endif
 #define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 )  | ( b << 8 ) | a )
 
@@ -41,7 +44,7 @@ EXPORT_SYMBOL(sharpsl_param);
 
 void sharpsl_save_param(void)
 {
-	memcpy(&sharpsl_param, (void *)PARAM_BASE, sizeof(struct sharpsl_param_info));
+	memcpy(&sharpsl_param, param_start(PARAM_BASE), sizeof(struct sharpsl_param_info));
 
 	if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
 		sharpsl_param.comadj=-1;
-- 
1.8.1.5

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