From: Richard Purdie <rpurdie@rpsys.net>
Date: Wed, 1 Feb 2006 19:26:00 +0000 (+0000)
Subject: [ARM] 3292/1: Fix memory corruption in asm-arm/checksum.h: ip_fast_csum()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=62500d1f8eadff078cca462dc4df035a29180383;p=linux-beck.git

[ARM] 3292/1: Fix memory corruption in asm-arm/checksum.h: ip_fast_csum()

Patch from Richard Purdie

ip_fast_csum() accesses memory via a pointer (iph) within an
asm function. To prevent memory corruption when the function is
inlined, it needs "memory" on the clobber list.

This fixes ip checksum errors reported by a Zaurus user.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/include/asm-arm/checksum.h b/include/asm-arm/checksum.h
index d4256d5f3a7c..747bdd31a74b 100644
--- a/include/asm-arm/checksum.h
+++ b/include/asm-arm/checksum.h
@@ -77,7 +77,7 @@ ip_fast_csum(unsigned char * iph, unsigned int ihl)
 	mov	%0, %0, lsr #16"
 	: "=r" (sum), "=r" (iph), "=r" (ihl), "=r" (tmp1)
 	: "1" (iph), "2" (ihl)
-	: "cc");
+	: "cc", "memory");
 	return sum;
 }