nvme: do not restart the request timeout if we're resetting the controller

nvme: do not restart the request timeout if we're resetting the controller

Otherwise we're never going to complete a command when it is restarted just
after we completed all other outstanding commands in nvme_clear_queue.

The controller must be disabled prior to completing a presumed lost
command, do this by directly shutting down the controller before
queueing the reset work, and return EH_HANDLED from the timeout handler
after we shut the controller down.

Signed-off-by: Keith Busch <keith.busch@intel.com>
[hch: split and rebase]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
(cherry picked from commit e1569a16180aef4311ff5fc54f54b23ae9e8a03e)

Orabug: 25130845

Signed-off-by: Ashok Vairavan <ashok.vairavan@oracle.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>