[PATCH 2/4] blk-mq: retrieve bios before update nr_hw_queues
From: Jianchao Wang <hidden>
Date: 2018-09-11 09:47:23
Also in:
linux-nvme, lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
retrieve bios of requests on queue to drain requests, then: - avoid fail requests on dying hw queue - needn't depend on storage device to drain the queue any more Signed-off-by: Jianchao Wang <redacted> --- block/blk-mq.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 3d59741..adc14f0 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c@@ -3013,7 +3013,15 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, return; list_for_each_entry(q, &set->tag_list, tag_set_list) - blk_mq_freeze_queue(q); + blk_freeze_queue_start(q); + + /* + * Wait the percpu ref to be switched to atomic mode. + */ + synchronize_sched(); + + list_for_each_entry(q, &set->tag_list, tag_set_list) + blk_mq_sched_retrieve_bios(q); /* * Sync with blk_mq_queue_tag_busy_iter. */
--
2.7.4