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

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);