From 3c8d9a957d0ae62c2815393a781ab7ff4d5205e7 Mon Sep 17 00:00:00 2001
From: James Bottomley <jbottomley@parallels.com>
Date: Fri, 4 May 2012 09:40:04 +0000
Subject: [PATCH] [SCSI] fix oops in all legacy host adapters caused by 6f381fa

Commit 6f381fa344911d5a234b13574433cf23036f9467
Author: Lin Ming <ming.m.lin@intel.com>

[SCSI] scsi_lib: use correct DMA device in __scsi_alloc_queue

Caused a regression where we oops in every legacy mode SCSI host driver
because they supply a NULL pointer to scsi_add_host().  Fix this by checking
for the NULL in scsi_add_host_with_dma() and changing the DMA device to being
the platform_bus in that case (which replicates the original behaviour).

Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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