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drm/radeon: fix scatter-gather mapping with user pages

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Calls to dma_map_sg may return less segments / entries than requested
if they fall on page bounderies. The old implementation did not
support this use case.

Fixes: be62dbf554 ("iommu/amd: Convert AMD iommu driver to the dma-iommu api")
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=206461
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=206895
Bug: https://gitlab.freedesktop.org/drm/amd/issues/1056
Signed-off-by: Shane Francis <bigbeeshane@gmail.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200325090741.21957-4-bigbeeshane@gmail.com
Cc: stable@vger.kernel.org
This commit is contained in:
Shane Francis 2020-03-25 09:07:41 +00:00 committed by Alex Deucher
parent 0199172f93
commit 47f7826c52
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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@ -528,7 +528,7 @@ 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,