blk-mq: request deadline must be visible before marking rq as started

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When we start the request, we set the deadline and flip the bits
marking the request as started and non-complete. However, it's
important that the deadline store is ordered before flipping the
bits, otherwise we could have a small window where the request is
marked started but with an invalid deadline. This can confuse the
timeout handling.

Suggested-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

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Jens Axboe 2014-09-16 10:37:37 -06:00

parent 37504a3be9

commit 538b753418

1 changed files with 6 additions and 0 deletions

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block/blk-mq.c

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