Query about RQF_DONTPREP usage in nvme driver

[jianchao.wang]

Hi Keith

Sorry for bothering you. ;)

In scsi, when requeue the request with RQF_DONTPREP, scsi core will not
do the sglist mapping or some other driver specific data's allocation and initialization.

However, in nvme_pci_complete_rq, it will invoke the nvme_unmap_data unconditionally,
and when the request enters into nvme_queue_rq again, it just reserve some members of
nvme_request and redo the whole command preparation again when RQF_DONTPREP is set.
Even all the other transport have the same actions.

Do we have any specific consideration on this ?

Thanks in advance
Jiancaho