diff options
Diffstat (limited to 'block/blk-mq.c')
| -rw-r--r-- | block/blk-mq.c | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index c9fa4b294664..6eacc1dea8b7 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1094,7 +1094,7 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list, bool got_budget) { struct blk_mq_hw_ctx *hctx; - struct request *rq; + struct request *rq, *nxt; int errors, queued; if (list_empty(list)) @@ -1151,14 +1151,20 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list, if (list_empty(list)) bd.last = true; else { - struct request *nxt; - nxt = list_first_entry(list, struct request, queuelist); bd.last = !blk_mq_get_driver_tag(nxt, NULL, false); } ret = q->mq_ops->queue_rq(hctx, &bd); if (ret == BLK_STS_RESOURCE) { + /* + * If an I/O scheduler has been configured and we got a + * driver tag for the next request already, free it again. + */ + if (!list_empty(list)) { + nxt = list_first_entry(list, struct request, queuelist); + blk_mq_put_driver_tag(nxt); + } blk_mq_put_driver_tag_hctx(hctx, rq); list_add(&rq->queuelist, list); __blk_mq_requeue_request(rq); @@ -1181,13 +1187,6 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list, * that is where we will continue on next queue run. */ if (!list_empty(list)) { - /* - * If an I/O scheduler has been configured and we got a driver - * tag for the next request already, free it again. - */ - rq = list_first_entry(list, struct request, queuelist); - blk_mq_put_driver_tag(rq); - spin_lock(&hctx->lock); list_splice_init(list, &hctx->dispatch); spin_unlock(&hctx->lock); |