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asm-generic/io.h: allow barriers in io{read,write}{16,32}be

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While reviewing the addition of io{read,write}64be accessors, Arnd

-finds a potential problem:
"If an architecture overrides readq/writeq to have barriers but does
not override ioread64be/iowrite64be, this will lack the barriers and
behave differently from the little-endian version. I think the only
affected architecture is ARC, since ARM and ARM64 both override the
big-endian accessors to have the correct barriers, and all others
don't use barriers at all."

-suggests a fix for the same problem in existing code (16/32-bit
accessors); the fix leads "to a double-swap on architectures that
don't override the io{read,write}{16,32}be accessors, but it will
work correctly on all architectures without them having to override
these accessors."

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Horia Geantă 2016-05-19 18:10:43 +03:00 committed by Herbert Xu
parent 21a3d3b234
commit 7a1aedba70
1 changed files with 4 additions and 4 deletions
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8
include/asm-generic/io.h
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@ -613,7 +613,7 @@ static inline void iowrite32(u32 value, volatile void __iomem *addr)
#define ioread16be ioread16be
static inline u16 ioread16be(const volatile void __iomem *addr)
{
return __be16_to_cpu(__raw_readw(addr));
return swab16(readw(addr));
}
#endif
@ -621,7 +621,7 @@ static inline u16 ioread16be(const volatile void __iomem *addr)
#define ioread32be ioread32be
static inline u32 ioread32be(const volatile void __iomem *addr)
{
return __be32_to_cpu(__raw_readl(addr));
return swab32(readl(addr));
}
#endif
@ -629,7 +629,7 @@ static inline u32 ioread32be(const volatile void __iomem *addr)
#define iowrite16be iowrite16be
static inline void iowrite16be(u16 value, void volatile __iomem *addr)
{
__raw_writew(__cpu_to_be16(value), addr);
writew(swab16(value), addr);
}
#endif
@ -637,7 +637,7 @@ static inline void iowrite16be(u16 value, void volatile __iomem *addr)
#define iowrite32be iowrite32be
static inline void iowrite32be(u32 value, volatile void __iomem *addr)
{
__raw_writel(__cpu_to_be32(value), addr);
writel(swab32(value), addr);
}
#endif