From 30c9afa6cc477f6f21f8a0b36f3b81080941a0c9 Mon Sep 17 00:00:00 2001
From: Joe Eykholt <jeykholt@cisco.com>
Date: Mon, 15 Jun 2009 23:22:14 -0700
Subject: [PATCH] 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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