drm/amdgpu: refine error handling in amdgpu_ttm_tt_pin_userptr

Free sg table when dma_map_sgtable() failed to avoid memory leak.

Signed-off-by: Lang Yu <[email protected]>
Reviewed-by: Alex Deucher <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: Lang Yu

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -812,14 +812,16 @@ static int amdgpu_ttm_tt_pin_userptr(struct ttm_device *bdev,
 	/* Map SG to device */
 	r = dma_map_sgtable(adev->dev, ttm->sg, direction, 0);
 	if (r)
-		goto release_sg;
+		goto release_sg_table;
 
 	/* convert SG to linear array of pages and dma addresses */
 	drm_prime_sg_to_dma_addr_array(ttm->sg, gtt->ttm.dma_address,
 				       ttm->num_pages);
 
 	return 0;
 
+release_sg_table:
+	sg_free_table(ttm->sg);
 release_sg:
 	kfree(ttm->sg);
 	ttm->sg = NULL;