From 9d713c2bfb5e1d6abb18a8b12293631f9fcdc708 Mon Sep 17 00:00:00 2001
From: Keith Busch <keith.busch@intel.com>
Date: Mon, 15 Jul 2013 15:02:24 -0600
Subject: [PATCH] NVMe: Handle ioremap failure

Decrement the number of queues required for doorbell remapping until
the memory is successfully mapped for that size.

Additional checks are done so that we don't call free_irq if it has
already been freed.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
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