diff options
| author | Jianchao Wang <jianchao.w.wang@oracle.com> | 2018-08-21 15:15:03 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-08-21 09:02:55 -0600 |
| commit | d48ece209f82c9ce07be942441b53d3fa3664936 (patch) | |
| tree | ddf957d9d4edf1915558bc528fee6696cc02f1ed /block/blk-mq-sched.c | |
| parent | fcedba42d94ecdc14ca13d3797cba1ccbf743fa4 (diff) | |
blk-mq: init hctx sched after update ctx and hctx mapping
Currently, when update nr_hw_queues, IO scheduler's init_hctx will
be invoked before the mapping between ctx and hctx is adapted
correctly by blk_mq_map_swqueue. The IO scheduler init_hctx (kyber)
may depend on this mapping and get wrong result and panic finally.
A simply way to fix this is that switch the IO scheduler to 'none'
before update the nr_hw_queues, and then switch it back after
update nr_hw_queues. blk_mq_sched_init_/exit_hctx are removed due
to nobody use them any more.
Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq-sched.c')
| -rw-r--r-- | block/blk-mq-sched.c | 44 |
1 files changed, 0 insertions, 44 deletions
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c index cf9c66c6d35a..29bfe8017a2d 100644 --- a/block/blk-mq-sched.c +++ b/block/blk-mq-sched.c @@ -462,50 +462,6 @@ static void blk_mq_sched_tags_teardown(struct request_queue *q) blk_mq_sched_free_tags(set, hctx, i); } -int blk_mq_sched_init_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx, - unsigned int hctx_idx) -{ - struct elevator_queue *e = q->elevator; - int ret; - - if (!e) - return 0; - - ret = blk_mq_sched_alloc_tags(q, hctx, hctx_idx); - if (ret) - return ret; - - if (e->type->ops.mq.init_hctx) { - ret = e->type->ops.mq.init_hctx(hctx, hctx_idx); - if (ret) { - blk_mq_sched_free_tags(q->tag_set, hctx, hctx_idx); - return ret; - } - } - - blk_mq_debugfs_register_sched_hctx(q, hctx); - - return 0; -} - -void blk_mq_sched_exit_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx, - unsigned int hctx_idx) -{ - struct elevator_queue *e = q->elevator; - - if (!e) - return; - - blk_mq_debugfs_unregister_sched_hctx(hctx); - - if (e->type->ops.mq.exit_hctx && hctx->sched_data) { - e->type->ops.mq.exit_hctx(hctx, hctx_idx); - hctx->sched_data = NULL; - } - - blk_mq_sched_free_tags(q->tag_set, hctx, hctx_idx); -} - int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e) { struct blk_mq_hw_ctx *hctx; |