ARM: fix out[bwl]()

out[bwl]() had a side effect that gcc read-back from the register after
writing its value.  This causes a problem for at least 3c589_cs, which
spits out lots of "adapter failure, FIFO diagnostic register 2011."

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 11 insertions, 13 deletions

diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 9af5563dd3eb..815c669fec0a 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -47,9 +47,9 @@ extern void __raw_readsb(const void __iomem *addr, void *data, int bytelen);
 extern void __raw_readsw(const void __iomem *addr, void *data, int wordlen);
 extern void __raw_readsl(const void __iomem *addr, void *data, int longlen);
 
-#define __raw_writeb(v,a)       (__chk_io_ptr(a), *(volatile unsigned char __force  *)(a) = (v))
-#define __raw_writew(v,a)       (__chk_io_ptr(a), *(volatile unsigned short __force *)(a) = (v))
-#define __raw_writel(v,a)       (__chk_io_ptr(a), *(volatile unsigned int __force   *)(a) = (v))
+#define __raw_writeb(v,a)       ((void)(__chk_io_ptr(a), *(volatile unsigned char __force  *)(a) = (v)))
+#define __raw_writew(v,a)       ((void)(__chk_io_ptr(a), *(volatile unsigned short __force *)(a) = (v)))
+#define __raw_writel(v,a)       ((void)(__chk_io_ptr(a), *(volatile unsigned int __force   *)(a) = (v)))
 
 #define __raw_readb(a)          (__chk_io_ptr(a), *(volatile unsigned char __force  *)(a))
 #define __raw_readw(a)          (__chk_io_ptr(a), *(volatile unsigned short __force *)(a))
@@ -229,11 +229,9 @@ extern void _memset_io(volatile void __iomem *, int, size_t);
 #define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \
                                         __raw_readl(c)); __r; })
 
-#define writeb_relaxed(v,c)     ((void)__raw_writeb(v,c))
-#define writew_relaxed(v,c)     ((void)__raw_writew((__force u16) \
-                                        cpu_to_le16(v),c))
-#define writel_relaxed(v,c)     ((void)__raw_writel((__force u32) \
-                                        cpu_to_le32(v),c))
+#define writeb_relaxed(v,c)     __raw_writeb(v,c)
+#define writew_relaxed(v,c)     __raw_writew((__force u16) cpu_to_le16(v),c)
+#define writel_relaxed(v,c)     __raw_writel((__force u32) cpu_to_le32(v),c)
 
 #define readb(c)                ({ u8  __v = readb_relaxed(c); __iormb(); __v; })
 #define readw(c)                ({ u16 __v = readw_relaxed(c); __iormb(); __v; })
@@ -281,12 +279,12 @@ extern void _memset_io(volatile void __iomem *, int, size_t);
 #define ioread16be(p)   ({ unsigned int __v = be16_to_cpu((__force __be16)__raw_readw(p)); __iormb(); __v; })
 #define ioread32be(p)   ({ unsigned int __v = be32_to_cpu((__force __be32)__raw_readl(p)); __iormb(); __v; })
 
-#define iowrite8(v,p)   ({ __iowmb(); (void)__raw_writeb(v, p); })
-#define iowrite16(v,p)  ({ __iowmb(); (void)__raw_writew((__force __u16)cpu_to_le16(v), p); })
-#define iowrite32(v,p)  ({ __iowmb(); (void)__raw_writel((__force __u32)cpu_to_le32(v), p); })
+#define iowrite8(v,p)   ({ __iowmb(); __raw_writeb(v, p); })
+#define iowrite16(v,p)  ({ __iowmb(); __raw_writew((__force __u16)cpu_to_le16(v), p); })
+#define iowrite32(v,p)  ({ __iowmb(); __raw_writel((__force __u32)cpu_to_le32(v), p); })
 
-#define iowrite16be(v,p) ({ __iowmb(); (void)__raw_writew((__force __u16)cpu_to_be16(v), p); })
-#define iowrite32be(v,p) ({ __iowmb(); (void)__raw_writel((__force __u32)cpu_to_be32(v), p); })
+#define iowrite16be(v,p) ({ __iowmb(); __raw_writew((__force __u16)cpu_to_be16(v), p); })
+#define iowrite32be(v,p) ({ __iowmb(); __raw_writel((__force __u32)cpu_to_be32(v), p); })
 
 #define ioread8_rep(p,d,c)      __raw_readsb(p,d,c)
 #define ioread16_rep(p,d,c)     __raw_readsw(p,d,c)