On Tue, 2017-06-06 at 23:22 +0800, Ming Lei wrote: > If queue is stopped, we shouldn't dispatch request into driver and > hardware, unfortunately the check is removed in bd166ef183c2(blk-mq-sched: > add framework for MQ capable IO schedulers). > > This patch fixes the issue by moving the check back into > __blk_mq_try_issue_directly(). > > This patch fixes request use-after-free[1][2] during canceling requets > of NVMe in nvme_dev_disable(), which can be triggered easily during > NVMe reset & remove test. Although I'm not convinced that this patch fixes [2], the patch itself looks fine to me. Hence: Reviewed-by: Bart Van Assche <Bart.VanAssche@xxxxxxxxxxx>