Am 25.03.20 um 01:24 schrieb Shane Francis:
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@xxxxxxxxx>
---
drivers/gpu/drm/drm_prime.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 86d9b0e45c8c..e4eff5b84597 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -965,12 +965,14 @@ int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
u32 len, index;
dma_addr_t addr;
+
Unrelated newline change, apart from that the patch looks good to me.
Christian.
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);
+
while (len > 0) {
if (WARN_ON(index >= max_entries))
return -1;
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