On 8/21/18 1:15 AM, Jianchao Wang wrote: > Hi Jens > > Two fixes for updating nr_hw_queues. > > The first patch fixes the following scenario: > io scheduler (kyber) depends on the mapping between ctx and hctx. > When update nr_hw_queues, io scheduler's init_hctx will be > invoked before the mapping is adapted correctly, this would cause > panic in kyber. > > The second patch fixes the following scenario: > 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. This looks good to me know, I'll queue it up for some testing. -- Jens Axboe
