>-----Original Message-----
>From: dri-devel <dri-devel-boun...@lists.freedesktop.org> On Behalf Of
>Shane Francis
>Sent: Wednesday, March 25, 2020 5:08 AM
>To: dri-devel@lists.freedesktop.org
>Cc: airl...@linux.ie; linux-ker...@vger.kernel.org; bigbeesh...@gmail.com;
>amd-gfx-requ...@lists.freedesktop.org; alexander.deuc...@amd.com;
>christian.koe...@amd.com
>Subject: [PATCH v4 2/3] drm/amdgpu: fix scatter-gather mapping with user
>pages
>
>Calls to dma_map_sg may return segments / entries than requested
"may return less segments/entries" ?
^^^
>if they fall on page bounderies. The old implementation did not
>support this use case.
>
>Signed-off-by: Shane Francis <bigbeesh...@gmail.com>
>---
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>index dee446278417..c6e9885c071f 100644
>--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>@@ -974,7 +974,7 @@ static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt
>*ttm)
> /* Map SG to device */
> r = -ENOMEM;
> nents = dma_map_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents,
>direction);
>- if (nents != ttm->sg->nents)
>+ if (nents == 0)
> goto release_sg;
this looks correct to me.
Reviewed-by: Michael J. Ruhl <michael.j.r...@intel.com>
> /* convert SG to linear array of pages and dma addresses */
>--
>2.26.0
>
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