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| author | Ming Lei <ming.lei@redhat.com> | 2017-11-08 09:11:22 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-11-10 19:53:25 -0700 |
| commit | 0c6af1ccd5fd9ac640aef01c8de0043837451a04 (patch) | |
| tree | e367c79457485a183e6231868fa5fb8fce2b2e40 | |
| parent | f00c4d80ffdac9e3a64947ebd57489f3232d5a74 (diff) | |
| download | op-kernel-dev-0c6af1ccd5fd9ac640aef01c8de0043837451a04.zip op-kernel-dev-0c6af1ccd5fd9ac640aef01c8de0043837451a04.tar.gz | |
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>
| -rw-r--r-- | block/blk-mq.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index c501cbd..3d759bb 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -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); |
