From 8c99e57d3926959dd940e834da6fa707601ba7e5 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 31 Jan 2014 11:34:58 +0000
Subject: [PATCH] drm/i915: Treat using a purged buffer as a source of EFAULT

Since a purged buffer is one without any associated pages, attempting to
use it should generate EFAULT rather than EINVAL, as it is not strictly
an invalid parameter.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Reading git-format-patch failed