Am 30.03.21 um 16:04 schrieb Guchun Chen:
Leverage the same logic from amdgpu_ttm_tt_unpin_userptr.

Signed-off-by: Guchun Chen <[email protected]>

Reviewed-by: Christian König <[email protected]>

---
  drivers/gpu/drm/radeon/radeon_ttm.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c 
b/drivers/gpu/drm/radeon/radeon_ttm.c
index 37ac42d6740f..2a61cff325e4 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -415,7 +415,7 @@ static void radeon_ttm_tt_unpin_userptr(struct ttm_device 
*bdev, struct ttm_tt *
                DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
/* double check that we don't free the table twice */
-       if (!ttm->sg->sgl)
+       if (!ttm->sg || !ttm->sg->sgl)
                return;
/* free the sg table and pages again */

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