[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 d4256d5f3a7c1f84553fec367ccdf47eff71fb6f..747bdd31a74b9bf1af4c5df957ce70812bc1802b 100644 (file)
--- 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;
 }