On 2021-11-25 13:49, guangming.cao@xxxxxxxxxxxx wrote:
From: Guangming <Guangming.Cao@xxxxxxxxxxxx>
Use (for_each_sgtable_sg) rather than (for_each_sg) to traverse
sg_table to free sg_table.
Use (for_each_sg) maybe will casuse some pages can't be freed
when send wrong nents number.
It's still worth spelling out that this is fixing a bug where the
current code should have been using table->orig_nents - it's just that
switching to the sgtable helper is the best way to make the fix, since
it almost entirely removes the possibility of making that (previously
rather common) mistake.
If it helps, for the change itself:
Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx>
Thanks,
Robin.
Signed-off-by: Guangming <Guangming.Cao@xxxxxxxxxxxx>
---
drivers/dma-buf/heaps/system_heap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c
index 23a7e74ef966..8660508f3684 100644
--- a/drivers/dma-buf/heaps/system_heap.c
+++ b/drivers/dma-buf/heaps/system_heap.c
@@ -289,7 +289,7 @@ static void system_heap_dma_buf_release(struct dma_buf *dmabuf)
int i;
table = &buffer->sg_table;
- for_each_sg(table->sgl, sg, table->nents, i) {
+ for_each_sgtable_sg(table, sg, i) {
struct page *page = sg_page(sg);
__free_pages(page, compound_order(page));
