[PATCHv3 0/1] Update SCSI hosts to use idr for host number mgmt

[Lee Duncan <lduncan@suse.com>]

This patch updates the SCSI hosts module to use the idr
index-management routines to manage its host_no index instead
of using an ATOMIC integer. This means that host numbers
can now be reclaimed and re-used.

It also updates the hosts module to use the idr routine idr_find()
to lookup hosts based on the host number, hopefully speeding
up said lookup.

After noticing that my idr calling sequences where very close
to those in other modules, I considered creating some idr helper
functions (and using them), but because idr usage almost always
requires the caller to manage their own locks, I gave up on
this approach (as suggested by Tejon -- thank you).

Changes from v1:
 - no longer using helper routines
Changes from v2:
 - added back missing scsi_host_get() in scsi_host_lookup()

Lee Duncan (1):
  SCSI: update hosts module to use idr index management

 drivers/scsi/hosts.c | 61 ++++++++++++++++++++++++++--------------------------
 1 file changed, 31 insertions(+), 30 deletions(-)

-- 
2.1.4