Commit 42e67b47 authored by Shane Francis's avatar Shane Francis Committed by Alex Deucher

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: be62dbf5 ("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/1056Signed-off-by: default avatarShane Francis <bigbeeshane@gmail.com>
Reviewed-by: default avatarMichael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200325090741.21957-2-bigbeeshane@gmail.com
Cc: stable@vger.kernel.org
parent b216a8e7
...@@ -967,7 +967,7 @@ int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, ...@@ -967,7 +967,7 @@ int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
index = 0; index = 0;
for_each_sg(sgt->sgl, sg, sgt->nents, count) { for_each_sg(sgt->sgl, sg, sgt->nents, count) {
len = sg->length; len = sg_dma_len(sg);
page = sg_page(sg); page = sg_page(sg);
addr = sg_dma_address(sg); addr = sg_dma_address(sg);
......
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