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    Subject[PATCH v4 2/3] drm/amdgpu: fix scatter-gather mapping with user pages
    Date
    Calls to dma_map_sg may return segments / entries than requested
    if they fall on page bounderies. The old implementation did not
    support this use case.

    Signed-off-by: Shane Francis <bigbeeshane@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;

    /* convert SG to linear array of pages and dma addresses */
    --
    2.26.0
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