From: Joe Eykholt <jeykholt@cisco.com>
Date: Tue, 16 Jun 2009 06:22:14 +0000 (-0700)
Subject: fix race that can give duplicate host number
X-Git-Tag: v2.6.31-rc1~32^2~27
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=30c9afa6cc477f6f21f8a0b36f3b81080941a0c9;p=pandora-kernel.git

fix race that can give duplicate host number

Just once, two fcoe instances got the same host number
from scsi_add_host().

Use atomic_t and atomic_inc_return() to get next host number.
Subtract 1, so that scsi_host still starts with 0.

[jejb: added comment about unusual subtraction]
Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
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