6.17-stable review patch. If anyone has any objections, please let me know.
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From: Yu Kuai yukuai3@huawei.com
[ Upstream commit 7f2799c546dba9e12f9ff4d07936601e416c640d ]
For shared tags case, all hctx->sched_tags/tags are the same, it doesn't make sense to call into blk_mq_tag_update_depth() multiple times for the same tags.
Signed-off-by: Yu Kuai yukuai3@huawei.com Reviewed-by: Nilay Shroff nilay@linux.ibm.com Signed-off-by: Jens Axboe axboe@kernel.dk Stable-dep-of: b86433721f46 ("blk-mq: fix potential deadlock while nr_requests grown") Signed-off-by: Sasha Levin sashal@kernel.org --- block/blk-mq-tag.c | 7 ------- block/blk-mq.c | 43 ++++++++++++++++++++++--------------------- 2 files changed, 22 insertions(+), 28 deletions(-)
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index 725210f27471c..aed84c5d5c2b2 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -596,13 +596,6 @@ int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx, struct blk_mq_tag_set *set = hctx->queue->tag_set; struct blk_mq_tags *new;
- /* - * Only the sbitmap needs resizing since we allocated the max - * initially. - */ - if (blk_mq_is_shared_tags(set->flags)) - return 0; - new = blk_mq_alloc_map_and_rqs(set, hctx->queue_num, tdepth); if (!new) return -ENOMEM; diff --git a/block/blk-mq.c b/block/blk-mq.c index a81ef562014d6..bcb7495893a09 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -4934,34 +4934,35 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr)
blk_mq_quiesce_queue(q);
- queue_for_each_hw_ctx(q, hctx, i) { - if (!hctx->tags) - continue; - /* - * If we're using an MQ scheduler, just update the scheduler - * queue depth. This is similar to what the old code would do. - */ - if (hctx->sched_tags) { - ret = blk_mq_tag_update_depth(hctx, &hctx->sched_tags, - nr); - } else { - ret = blk_mq_tag_update_depth(hctx, &hctx->tags, nr); - } - if (ret) - goto out; - } - - q->nr_requests = nr; - if (q->elevator && q->elevator->type->ops.depth_updated) - q->elevator->type->ops.depth_updated(q); - if (blk_mq_is_shared_tags(set->flags)) { if (q->elevator) blk_mq_tag_update_sched_shared_tags(q); else blk_mq_tag_resize_shared_tags(set, nr); + } else { + queue_for_each_hw_ctx(q, hctx, i) { + if (!hctx->tags) + continue; + /* + * If we're using an MQ scheduler, just update the + * scheduler queue depth. This is similar to what the + * old code would do. + */ + if (hctx->sched_tags) + ret = blk_mq_tag_update_depth(hctx, + &hctx->sched_tags, nr); + else + ret = blk_mq_tag_update_depth(hctx, + &hctx->tags, nr); + if (ret) + goto out; + } }
+ q->nr_requests = nr; + if (q->elevator && q->elevator->type->ops.depth_updated) + q->elevator->type->ops.depth_updated(q); + out: blk_mq_unquiesce_queue(q);