Albrecht Dreß wrote:
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.dr...@arcor.de>
---
diff -urpN -X linux-2.6.29.1.orig/Documentation/dontdiff
linux-2.6.29.1.orig/arch/powerpc/kernel/io.c
linux-2.6.29.1/arch/powerpc/kernel/io.c
--- linux-2.6.29.1.orig/arch/powerpc/kernel/io.c 2009-04-02
22:55:27.000000000 +0200
+++ linux-2.6.29.1/arch/powerpc/kernel/io.c 2009-05-27
11:36:09.000000000 +0200
@@ -161,7 +161,7 @@ void _memcpy_fromio(void *dest, const vo
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
vdest++;
n--;
}
- while(n > 4) {
+ while(n >= 4) {
*((volatile u32 *)vdest) = *((volatile u32 *)src);
src += 4;
vdest += 4;
------------------------------------------------------------------------
Works for me (and some custom hardware I created [quite a while ago,
when I was young ;-)] that is not very tolerant to Byte-by-Byte-Transfers).
Thus:
Acked
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