[PATCH 0/9] nvme: dead code cleanups

[Guixin Liu]

A round of dead code removals in the nvme host and target drivers,
all found by code inspection. Every patch stands on its own and can
be picked individually:

 - the NVMEQ_DELETE_ERROR flag lost its only reader in 2020 and is
   now write-only; dropping it also removes the nvme_del_cq_end()
   wrapper, which degenerates to nvme_del_queue_end() without it
 - struct fields never referenced since they were introduced:
   nvme_fc_queue.seqno, nvme_dhchap_queue_context.entry,
   nvmet_fc_ls_iod.fcpreq and nvmet_fc_tgt_queue.ninetypercent
 - a hostnqn already-assigned check that can never fire because
   opts->host is only set after the option parsing loop
 - the reconnect_delay "off" case, copied from fast_io_fail_tmo but
   unreachable for an unsigned value the parser bounds to positive
   values
 - an address family map entry that both show and store skip, an
   unreachable break in the passthru feature handling, and a drain
   of an SQ list that is never populated

Guixin Liu (9):
  nvme-pci: remove write-only NVMEQ_DELETE_ERROR flag
  nvme-fc: remove dead seqno field in nvme_fc_queue
  nvme-auth: remove dead entry field in nvme_dhchap_queue_context
  nvme-fabrics: remove dead hostnqn already-assigned check
  nvme: drop unreachable "off" case in reconnect_delay_show()
  nvmet-fc: remove dead fields in nvmet_fc_ls_iod and nvmet_fc_tgt_queue
  nvmet: remove unreachable "pcie" entry from the address family map
  nvmet: passthru: remove unreachable break statements
  nvmet-pci-epf: don't drain the never-populated SQ list

 drivers/nvme/host/auth.c       |  1 -
 drivers/nvme/host/fabrics.c    |  6 ------
 drivers/nvme/host/fc.c         |  1 -
 drivers/nvme/host/pci.c        | 20 +-------------------
 drivers/nvme/host/sysfs.c      |  2 --
 drivers/nvme/target/configfs.c |  5 ++---
 drivers/nvme/target/fc.c       |  3 ---
 drivers/nvme/target/passthru.c |  2 --
 drivers/nvme/target/pci-epf.c  |  2 --
 9 files changed, 3 insertions(+), 39 deletions(-)

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2.43.7