diff options
| author | Shane Francis <bigbeeshane@gmail.com> | 2020-03-25 09:07:39 +0000 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2020-03-25 12:01:23 -0400 |
| commit | 42e67b479eab6d26459b80b4867298232b0435e7 (patch) | |
| tree | 5b497900fd7350ff51c89e623f5d4ab5760c2700 /drivers/gpu | |
| parent | b216a8e7908cd750550c0480cf7d2b3a37f06954 (diff) | |
| download | linux-42e67b479eab6d26459b80b4867298232b0435e7.tar.bz2 | |
drm/prime: use dma length macro when mapping sg
As dma_map_sg can reorganize scatter-gather lists in a
way that can cause some later segments to be empty we should
always use the sg_dma_len macro to fetch the actual length.
This could now be 0 and not need to be mapped to a page or
address array
Fixes: be62dbf554c5 ("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/20200325090741.21957-2-bigbeeshane@gmail.com
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_prime.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 86d9b0e45c8c..1de2cde2277c 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -967,7 +967,7 @@ int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, index = 0; for_each_sg(sgt->sgl, sg, sgt->nents, count) { - len = sg->length; + len = sg_dma_len(sg); page = sg_page(sg); addr = sg_dma_address(sg); |