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drm/radeon: avoid potential null pointer access

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Leverage the same logic from amdgpu_ttm_tt_unpin_userptr.

Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Guchun Chen 2021-03-30 22:02:06 +08:00 committed by Alex Deucher
parent 9973de10b5
commit fd6ecc9069
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/radeon/radeon_ttm.c
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@ -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 */