From 7acf570ce51a5ebee55ef72e77916afdb4a351a7 Mon Sep 17 00:00:00 2001
From: Stephen Cameron <stephenmcameron@gmail.com>
Date: Fri, 23 Jan 2015 16:43:14 -0600
Subject: [PATCH] hpsa: do not request device rescan on every ioaccel path
 error

The original reasoning behind doing this was faulty.  An error
of some sort would be encountered, accelerated i/o would be
disabled for that logical drive, the command would be kicked
back out to the SCSI midlayer for a retry, and since i/o accelerator
mode was disabled, it would get retried down the RAID path.
However, something needs to turn ioaccellerator mode back on,
and this rescan request was what did that.  However, it was racy,
and extremely bad for performance to rescan all devices, so,
don't do that.

Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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