From e79e0fe380847493266fba557217e2773c61bd1b Mon Sep 17 00:00:00 2001
From: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>
Date: Wed, 3 Oct 2012 17:15:26 +0300
Subject: [PATCH] drm/i915: EBUSY status handling added to i915_gem_fault().

Subsequent threads returning EBUSY from vm_insert_pfn() was not handled
correctly. As a result concurrent access from new threads to
mmapped data caused SIGBUS.

Note that this fixes i-g-t/tests/gem_threaded_tiled_access.

Tested-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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