Much like amdgpu, the radeon driver doesn't appear to directly use the
scatterlist mapped by radeon_ttm_tt_pin_userptr(), it merely hands it
off to drm_prime_sg_to_page_addr_arrays() to generate the dma_address
array which it actually cares about. Now that the latter can cope with
dma_map_sg() coalescing dma-contiguous segments such that it returns
0 < count < nents, we can relax the current count == nents check to
only consider genuine failure as other drivers do.
Suggested-by: Christian König <christian.koe...@amd.com>
Reviewed-by: Christian König <christian.koe...@amd.com>
Signed-off-by: Robin Murphy <robin.mur...@arm.com>
---
v3: No change
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 8689fcca051c..7c099192c7fa 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -585,7 +585,7 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_tt *ttm)
r = -ENOMEM;
nents = dma_map_sg(rdev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
- if (nents != ttm->sg->nents)
+ if (nents == 0)
goto release_sg;
drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
--
2.17.0.dirty
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