From 495df3bad9f250a36470cce15f14c36c616172b6 Mon Sep 17 00:00:00 2001 From: Wolfgang Denk Date: Fri, 11 Feb 2011 12:25:48 +0000 Subject: [PATCH] ARM: fix write*() I/O accessors Commit 3c0659b "ARM: Avoid compiler optimization for readb, writeb and friends." introduced I/O accessors with memory barriers. Unfortunately the new write*() accessors introduced a bug: The problem is that the argument "v" gets evaluated twice. This breaks code like used here (from "drivers/net/dnet.c"): for (i = 0; i < wrsz; i++) writel(*bufp++, &dnet->regs->TX_DATA_FIFO); Use auxiliary variables to avoid such problems. Signed-off-by: Wolfgang Denk Cc: Albert Aribaud Cc: Alexander Holler Cc: Dirk Behme --- arch/arm/include/asm/io.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h index 3886f15899..1fbc531a08 100644 --- a/arch/arm/include/asm/io.h +++ b/arch/arm/include/asm/io.h @@ -133,9 +133,9 @@ extern inline void __raw_readsl(unsigned int addr, void *data, int longlen) #define __iormb() dmb() #define __iowmb() dmb() -#define writeb(v,c) ({ __iowmb(); __arch_putb(v,c); v; }) -#define writew(v,c) ({ __iowmb(); __arch_putw(v,c); v; }) -#define writel(v,c) ({ __iowmb(); __arch_putl(v,c); v; }) +#define writeb(v,c) ({ u8 __v = v; __iowmb(); __arch_putb(__v,c); __v; }) +#define writew(v,c) ({ u16 __v = v; __iowmb(); __arch_putw(__v,c); __v; }) +#define writel(v,c) ({ u32 __v = v; __iowmb(); __arch_putl(__v,c); __v; }) #define readb(c) ({ u8 __v = __arch_getb(c); __iormb(); __v; }) #define readw(c) ({ u16 __v = __arch_getw(c); __iormb(); __v; }) -- 2.39.5