blk-mq: Simplify request completion state
There are no more users relying on blk-mq request states to prevent double completions, so replace the relatively expensive cmpxchg operation with WRITE_ONCE. Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NKeith Busch <keith.busch@intel.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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