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

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>

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
index b04a3c2b111e09f7dcebb6bbc628a0f8bf50915a..f8fd8b98c30e3d5b6a72930c51bc43090dfe82b3 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
@@ -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;