blk-mq: Put driver tag in blk_mq_dispatch_rq_list() when no budget

If in blk_mq_dispatch_rq_list() we find no budget, then we break of the
dispatch loop, but the request may keep the driver tag, evaulated
in 'nxt' in the previous loop iteration.

Fix by putting the driver tag for that request.

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
John Garry 2020-04-16 19:18:51 +08:00 коммит произвёл Jens Axboe
Родитель 8f3d9f3542
Коммит 5fe56de799
1 изменённых файлов: 3 добавлений и 1 удалений

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@ -1222,8 +1222,10 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list,
rq = list_first_entry(list, struct request, queuelist);
hctx = rq->mq_hctx;
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;
}
if (!blk_mq_get_driver_tag(rq)) {
/*