On Wed, Aug 15, 2018 at 3:25 PM, Jianchao Wang <jianchao.w.wang@xxxxxxxxxx> wrote: > For blk-mq, part_in_flight/rw will invoke blk_mq_in_flight/rw to > account the inflight requests. It will access the queue_hw_ctx and > nr_hw_queues w/o any protection. When updating nr_hw_queues and > blk_mq_in_flight/rw occur concurrently, panic comes up. When updating nr_hw_queues, all queues are frozen, and there shouldn't be any inflight requests, so there shouldn't be such issue. Thanks, Ming Lei
