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author | Will Deacon <will.deacon@arm.com> | 2019-02-22 18:04:52 +0000 |
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committer | Catalin Marinas <catalin.marinas@arm.com> | 2019-02-28 17:22:47 +0000 |
commit | abbbbc83a210e95e2ae4ee71e50930a8cec6f081 (patch) | |
tree | cb621c9cd789a12ae84b344ee6eb985fe0f7f008 /arch/riscv/include/asm/io.h | |
parent | 3e32131abc311a5cb9fddecc72cbd0b95ffcc10d (diff) | |
download | linux-stable-abbbbc83a210e95e2ae4ee71e50930a8cec6f081.tar.gz linux-stable-abbbbc83a210e95e2ae4ee71e50930a8cec6f081.tar.bz2 linux-stable-abbbbc83a210e95e2ae4ee71e50930a8cec6f081.zip |
asm-generic/io: Pass result of I/O accessor to __io_[p]ar()
The inX() and readX() I/O accessors must enforce ordering against
subsequent calls to the delay() routines, so that a read-back from a
device can be used to postpone a subsequent write to the same device.
On some architectures, including arm64, this ordering can only be
achieved by creating a dependency on the value returned by the I/O
accessor operation, so we need to pass the value we read to the
__io_par() and __io_ar() macros in these cases.
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reported-by: Andrew Murray <andrew.murray@arm.com>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/riscv/include/asm/io.h')
0 files changed, 0 insertions, 0 deletions