[PATCH] drm/mediatek: stop iterating dma addresses when sg_dma_len() == 0

[Anand K Mistry]

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 at google.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_gem.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
index b04a3c2b111e09..f8fd8b98c30e3d 100644
--- 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;
-- 
2.26.1.301.g55bc3eb7cb9-goog