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drm/mediatek: Stop iterating dma addresses when sg_dma_len() == 0

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If dma_map_sg() merges pages when creating the mapping, only the first
entries will have a valid sg_dma_address() and sg_dma_len(), followed by
entries with sg_dma_len() == 0.

Signed-off-by: Anand K Mistry <amistry@google.com>
Signed-off-by: Anand K Mistry <amistry@chromium.org>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
This commit is contained in:
Anand K Mistry 2020-04-20 16:08:34 +10:00 committed by Chun-Kuang Hu
parent 424a3a706a
commit 9a67bc4aac
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/mediatek/mtk_drm_gem.c
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@ -224,6 +224,9 @@ struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
expected = sg_dma_address(sg->sgl);
for_each_sg(sg->sgl, s, sg->nents, i) {
if (!sg_dma_len(s))
break;
if (sg_dma_address(s) != expected) {
DRM_ERROR("sg_table is not contiguous");
ret = -EINVAL;