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authorChristoph Hellwig <hch@lst.de>2023-04-13 08:06:47 +0200
committerJens Axboe <axboe@kernel.dk>2023-04-13 06:57:18 -0600
commit89ea5ceb53d14f52ecbad8393be47f382c47c37d (patch)
tree1c95c5ce7fc34eff89bd471d89ccfb2c081fc41d /block
parentb12e5c6c755ae8bec44723f77f037873e3d08021 (diff)
blk-mq: cleanup __blk_mq_sched_dispatch_requests
__blk_mq_sched_dispatch_requests currently has duplicated logic for the cases where requests are on the hctx dispatch list or not. Merge the two with a new need_dispatch variable and remove a few pointless local variables. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Link: https://lore.kernel.org/r/20230413060651.694656-2-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq-sched.c31
1 files changed, 14 insertions, 17 deletions
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index f90fc42a88ca..67c95f31b15b 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -269,9 +269,7 @@ 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;
- const bool has_sched = q->elevator;
- int ret = 0;
+ bool need_dispatch = false;
LIST_HEAD(rq_list);
/*
@@ -300,23 +298,22 @@ 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)
- ret = blk_mq_do_dispatch_sched(hctx);
- else
- ret = blk_mq_do_dispatch_ctx(hctx);
- }
- } 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 */
- ret = blk_mq_do_dispatch_ctx(hctx);
+ if (!blk_mq_dispatch_rq_list(hctx, &rq_list, 0))
+ return 0;
+ need_dispatch = true;
} else {
- blk_mq_flush_busy_ctxs(hctx, &rq_list);
- blk_mq_dispatch_rq_list(hctx, &rq_list, 0);
+ need_dispatch = hctx->dispatch_busy;
}
- return ret;
+ if (hctx->queue->elevator)
+ return blk_mq_do_dispatch_sched(hctx);
+
+ /* dequeue request one by one from sw queue if queue is busy */
+ if (need_dispatch)
+ return blk_mq_do_dispatch_ctx(hctx);
+ blk_mq_flush_busy_ctxs(hctx, &rq_list);
+ blk_mq_dispatch_rq_list(hctx, &rq_list, 0);
+ return 0;
}
void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx)