From: Sinan Kaya Date: Thu, 5 Apr 2018 13:09:11 +0000 (-0400) Subject: io: define stronger ordering for the default writeX() implementation X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=755bd04aaf4bf7c49ce8aad2677ea4d14271fc46;p=linux.git io: define stronger ordering for the default writeX() implementation The default implementation of mapping writeX() to __raw_writeX() is wrong. writeX() has stronger ordering semantics. Compiler is allowed to reorder memory writes against __raw_writeX(). Use the previously defined __io_aw() and __io_bw() macros to harden code generation according to architecture support. Signed-off-by: Sinan Kaya Signed-off-by: Arnd Bergmann --- diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index d27e8af9dd5a6..964725e4f459b 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -208,7 +208,9 @@ static inline u64 readq(const volatile void __iomem *addr) #define writeb writeb static inline void writeb(u8 value, volatile void __iomem *addr) { + __io_bw(); __raw_writeb(value, addr); + __io_aw(); } #endif @@ -216,7 +218,9 @@ static inline void writeb(u8 value, volatile void __iomem *addr) #define writew writew static inline void writew(u16 value, volatile void __iomem *addr) { + __io_bw(); __raw_writew(cpu_to_le16(value), addr); + __io_aw(); } #endif @@ -224,7 +228,9 @@ static inline void writew(u16 value, volatile void __iomem *addr) #define writel writel static inline void writel(u32 value, volatile void __iomem *addr) { + __io_bw(); __raw_writel(__cpu_to_le32(value), addr); + __io_aw(); } #endif @@ -233,7 +239,9 @@ static inline void writel(u32 value, volatile void __iomem *addr) #define writeq writeq static inline void writeq(u64 value, volatile void __iomem *addr) { + __io_bw(); __raw_writeq(__cpu_to_le64(value), addr); + __io_aw(); } #endif #endif /* CONFIG_64BIT */