drm/radeon: add extra check in radeon_ttm_tt_unpin_userptr
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>
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index d02aa1d..b292aca 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -598,6 +598,10 @@
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);
