[PATCH v2 3/7] [RFC] nvme: Use BLK_MQ_S_STOPPED instead of QUEUE_FLAG_STOPPED in blk-mq code

[Sagi Grimberg]

> Make nvme_requeue_req() check BLK_MQ_S_STOPPED instead of
> QUEUE_FLAG_STOPPED. Remove the QUEUE_FLAG_STOPPED manipulations
> that became superfluous because of this change. This patch fixes
> a race condition: using queue_flag_clear_unlocked() is not safe
> if any other function that manipulates the queue flags can be
> called concurrently, e.g. blk_cleanup_queue(). Untested.

This looks good to me, but I know keith had all sort of
creative ways to challenge this are so I'd wait for his
input...