blk-mq: turn WARN_ON in __blk_mq_run_hw_queue into printk

We know this WARN_ON is harmless and in reality it may be trigged,
so convert it to printk() and dump_stack() to avoid to confusing
people.

Also add comment about two releated races here.

Cc: Christian Borntraeger <[email protected]>
Cc: Stefan Haberland <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: "jianchao.wang" <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

0 files changed, 0 insertions, 0 deletions