powerpc: tiny memcpy_(to|from)io optimisation

This trivial patch changes memcpy_(to|from)io as to transfer as many
32-bit words as possible in 32-bit accesses (in the current solution,
the last 32-bit word was transferred as 4 byte accesses).

Signed-off-by: Albrecht Dreß <albrecht.dress@arcor.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/io.c b/arch/powerpc/kernel/io.c
index 1882bf419fa6..8dc7547c2377 100644
--- a/arch/powerpc/kernel/io.c
+++ b/arch/powerpc/kernel/io.c
@@ -161,7 +161,7 @@ void _memcpy_fromio(void *dest, const volatile void __iomem *src,
                 dest++;
                 n--;
         }
-        while(n > 4) {
+        while(n >= 4) {
                 *((u32 *)dest) = *((volatile u32 *)vsrc);
                 eieio();
                 vsrc += 4;
@@ -190,7 +190,7 @@ void _memcpy_toio(volatile void __iomem *dest, const void *src, unsigned long n)
                 vdest++;
                 n--;
         }
-        while(n > 4) {
+        while(n >= 4) {
                 *((volatile u32 *)vdest) = *((volatile u32 *)src);
                 src += 4;
                 vdest += 4;