linux-kernel - [PATCH v4 1/3] drm/prime: use dma length macro when mapping sg

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Date:   Wed, 25 Mar 2020 09:07:39 +0000
From:   Shane Francis <bigbeeshane@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     amd-gfx-request@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, bigbeeshane@...il.com,
        alexander.deucher@....com, christian.koenig@....com,
        mripard@...nel.org, airlied@...ux.ie, David1.Zhou@....com
Subject: [PATCH v4 1/3] 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

Signed-off-by: Shane Francis <bigbeeshane@...il.com>
---
 drivers/gpu/drm/drm_prime.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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);
 
-- 
2.26.0