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blk-mq: put driver tag if dispatch budget can't be got

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We have to put the driver tag if dispatch budget can't be got, otherwise
it might cause IO deadlock, especially in case that size of tags is very
small.

Fixes: de1482974080(blk-mq: introduce .get_budget and .put_budget in blk_mq_ops)
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2017-11-08 09:11:22 +08:00 committed by Jens Axboe
parent f00c4d80ff
commit 0c6af1ccd5
1 changed files with 3 additions and 1 deletions
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4
block/blk-mq.c
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@ -1080,8 +1080,10 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list,
}
}
if (!got_budget && !blk_mq_get_dispatch_budget(hctx))
if (!got_budget && !blk_mq_get_dispatch_budget(hctx)) {
blk_mq_put_driver_tag(rq);
break;
}
list_del_init(&rq->queuelist);