On 2/21/21 11:54 PM, Jeffle Xu wrote: > QUEUE_FLAG_POLL flag will be cleared when turning off 'io_poll', while > at that moment there may be IOs stuck in hw queue uncompleted. The > following polling routine won't help reap these IOs, since blk_poll() > will return immediately because of cleared QUEUE_FLAG_POLL flag. Thus > these IOs will hang until they finnaly time out. The hang out can be > observed by 'fio --engine=io_uring iodepth=1', while turning off > 'io_poll' at the same time. > > To fix this, freeze and flush the request queue first when turning off > 'io_poll'. Applied, thanks. Fixed up the braces. -- Jens Axboe
