linux-kernel - [PATCHv4 0/1] Update SCSI hosts to use ida for host number mgmt

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Message-Id: <cover.1444241058.git.lduncan@suse.com>
Date:	Wed,  7 Oct 2015 16:51:33 -0700
From:	Lee Duncan <lduncan@...e.com>
To:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Lee Duncan <lduncan@...e.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Tejun Heo <tj@...nel.org>, Hannes Reinecke <hare@...e.com>,
	Johannes Thumshirn <jthumshirn@...e.de>,
	Christoph Hellwig <hch@...radead.org>
Subject: [PATCHv4 0/1] Update SCSI hosts to use ida for host number mgmt

This patch updates the SCSI hosts module to use the ida
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.

NOTE: it was not feasible to use idr_*() functions instead of
ida_*() functions, since using idr_find() without additional
locking to find our Scsi_Host structure left a window between
idr lookup and host structure deletion that would have
required additional locking to close.

Changes from v3:
 - Switched from idr to ida since managing our instance
   pointer required extra locking
Changes from v2 and v1:
 - First two version used idr instead of ida

Lee Duncan (1):
  SCSI: hosts: update to use ida_simple for host_no management

 drivers/scsi/hosts.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

-- 
2.1.4

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