From 863653fed0f449fb738295255cc834b271cfa088 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Tue, 31 Mar 2015 17:36:57 +0200
Subject: [PATCH] drm/radeon: add extra check in radeon_ttm_tt_unpin_userptr
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We somehow try to free the SG table twice.

Bugs: https://bugs.freedesktop.org/show_bug.cgi?id=89734

Signed-off-by: Christian König <christian.koenig@amd.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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Reading git-format-patch failed