Re: [PATCH v2] dma_heap: use for_each_sgtable_sg in sg_table release flow

[Kuan-Ying Lee]

On Thu, 2021-11-25 at 21:49 +0800, 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.

s/casuse/cause

> 
> 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));


If this is a fix, I think we should add Fixes: xxxx ("...") in the
commit message and Cc stable.

Thanks,
Kuan-Ying Lee