diff options
| -rw-r--r-- | block/blk-mq-sched.c | 13 | ||||
| -rw-r--r-- | block/elevator.c | 4 |
2 files changed, 10 insertions, 7 deletions
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c index 80273245d11a..2403a5c2b053 100644 --- a/block/blk-mq-sched.c +++ b/block/blk-mq-sched.c @@ -294,8 +294,7 @@ static int blk_mq_do_dispatch_ctx(struct blk_mq_hw_ctx *hctx) static int __blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx) { struct request_queue *q = hctx->queue; - struct elevator_queue *e = q->elevator; - const bool has_sched_dispatch = e && e->type->ops.dispatch_request; + const bool has_sched = q->elevator; int ret = 0; LIST_HEAD(rq_list); @@ -326,12 +325,12 @@ static int __blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx) if (!list_empty(&rq_list)) { blk_mq_sched_mark_restart_hctx(hctx); if (blk_mq_dispatch_rq_list(hctx, &rq_list, 0)) { - if (has_sched_dispatch) + if (has_sched) ret = blk_mq_do_dispatch_sched(hctx); else ret = blk_mq_do_dispatch_ctx(hctx); } - } else if (has_sched_dispatch) { + } else if (has_sched) { ret = blk_mq_do_dispatch_sched(hctx); } else if (hctx->dispatch_busy) { /* dequeue request one by one from sw queue if queue is busy */ @@ -463,7 +462,7 @@ void blk_mq_sched_insert_request(struct request *rq, bool at_head, goto run; } - if (e && e->type->ops.insert_requests) { + if (e) { LIST_HEAD(list); list_add(&rq->queuelist, &list); @@ -494,9 +493,9 @@ void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx, percpu_ref_get(&q->q_usage_counter); e = hctx->queue->elevator; - if (e && e->type->ops.insert_requests) + if (e) { e->type->ops.insert_requests(hctx, list, false); - else { + } else { /* * try to issue requests directly if the hw queue isn't * busy in case of 'none' scheduler, and this way may save diff --git a/block/elevator.c b/block/elevator.c index 06e203426410..85d0d4adbb64 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -522,6 +522,10 @@ void elv_unregister_queue(struct request_queue *q) int elv_register(struct elevator_type *e) { + /* insert_requests and dispatch_request are mandatory */ + if (WARN_ON_ONCE(!e->ops.insert_requests || !e->ops.dispatch_request)) + return -EINVAL; + /* create icq_cache if requested */ if (e->icq_size) { if (WARN_ON(e->icq_size < sizeof(struct io_cq)) || |