summaryrefslogtreecommitdiff
path: root/block
diff options
context:
space:
mode:
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq.c19
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);