From 882f85b5380e13093710f5a7ffbe575e85ba8fd8 Mon Sep 17 00:00:00 2001
From: Thomas Hellstrom <thellstrom@vmware.com>
Date: Sun, 8 Dec 2013 23:23:57 -0800
Subject: [PATCH] drm/ttm: Fix accesses through vmas with only partial coverage

commit d386735588c3e22129c2bc6eb64fc1d37a8f805c upstream.

VMAs covering a bo but that didn't start at the same address space offset as
the bo they were mapping were incorrectly generating SEGFAULT errors in
the fault handler.

Reported-by: Joseph Dolinak <kanilo2@yahoo.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
[bwh: Backported to 3.2: drm_vma_node_start() is open-coded;
 vma_pages() was open-coded]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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