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| author | John Garry <john.garry@huawei.com> | 2020-04-16 19:18:51 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-04-16 09:27:03 -0600 |
| commit | 5fe56de799ad03e92d794c7936bf363922b571df (patch) | |
| tree | 68b26c54cee0573e332f5aa2bb077f07189822ac /block/blk-mq.c | |
| parent | 8f3d9f354286745c751374f5f1fcafee6b3f3136 (diff) | |
| download | lwn-5fe56de799ad03e92d794c7936bf363922b571df.tar.gz lwn-5fe56de799ad03e92d794c7936bf363922b571df.zip | |
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>
Diffstat (limited to 'block/blk-mq.c')
| -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 8e56884fd2e9..a7785df2c944 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -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)) { /* |