[PATCH] dma_heap: use sg_table.orig_nents in sg_table release flow

[guangming.cao]

From: Guangming <guangming....@mediatek.com>

Use (sg_table.orig_nents) rather than (sg_table.nents) to traverse
sg_table to free sg_table.
Use (sg_table.nents) maybe will casuse some pages can't be freed.

Signed-off-by: Guangming <guangming....@mediatek.com>
---
 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..ce10d4eb674c 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_sg(table->sgl, sg, table->orig_nents, i) {
                struct page *page = sg_page(sg);
 
                __free_pages(page, compound_order(page));
-- 
2.17.1