[added to the 3.18 stable tree] drm/radeon: add extra check in radeon_ttm_tt_unpin_userptr

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From: Christian König <christian.koenig@xxxxxxx>

This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.

===============

[ Upstream commit 863653fed0f449fb738295255cc834b271cfa088 ]

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@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
 drivers/gpu/drm/radeon/radeon_ttm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index d2510cf..9ab8e26 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -575,6 +575,10 @@ static void radeon_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
 	enum dma_data_direction direction = write ?
 		DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 
+	/* double check that we don't free the table twice */
+	if (!ttm->sg->sgl)
+		return;
+
 	/* free the sg table and pages again */
 	dma_unmap_sg(rdev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
 
-- 
2.1.0

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