diff options
Diffstat (limited to 'block/blk-mq-sched.c')
| -rw-r--r-- | block/blk-mq-sched.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c index aa6bc5c02643..74c6bb871f7e 100644 --- a/block/blk-mq-sched.c +++ b/block/blk-mq-sched.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * blk-mq scheduling framework * @@ -413,6 +414,14 @@ void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx, struct list_head *list, bool run_queue_async) { struct elevator_queue *e; + struct request_queue *q = hctx->queue; + + /* + * blk_mq_sched_insert_requests() is called from flush plug + * context only, and hold one usage counter to prevent queue + * from being released. + */ + percpu_ref_get(&q->q_usage_counter); e = hctx->queue->elevator; if (e && e->type->ops.insert_requests) @@ -426,12 +435,14 @@ void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx, if (!hctx->dispatch_busy && !e && !run_queue_async) { blk_mq_try_issue_list_directly(hctx, list); if (list_empty(list)) - return; + goto out; } blk_mq_insert_requests(hctx, ctx, list); } blk_mq_run_hw_queue(hctx, run_queue_async); + out: + percpu_ref_put(&q->q_usage_counter); } static void blk_mq_sched_free_tags(struct blk_mq_tag_set *set, |