From 5fe56de799ad03e92d794c7936bf363922b571df Mon Sep 17 00:00:00 2001 From: John Garry Date: Thu, 16 Apr 2020 19:18:51 +0800 Subject: 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 Signed-off-by: John Garry Signed-off-by: Jens Axboe --- block/blk-mq.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'block') 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)) { /* -- cgit