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blk-mq: add might_sleep check to blk_mq_get_driver_tag()

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If the caller passes in wait=true, it has to be able to block
for a driver tag. We just had a bug where flush insertion
would block on tag allocation, while we had preempt disabled.
Ensure that we catch cases like that earlier next time.

Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2017-04-20 17:23:13 -06:00
parent 0206319fdf
commit 5feeacdd4a
1 changed files with 2 additions and 0 deletions
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2
block/blk-mq.c
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@ -864,6 +864,8 @@ bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx,
.flags = wait ? 0 : BLK_MQ_REQ_NOWAIT,
};
might_sleep_if(wait);
if (rq->tag != -1)
goto done;