linux-kernel - [PATCH v2] dma_heap: use for_each_sgtable_sg in sg

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Date:   Thu, 25 Nov 2021 21:49:51 +0800
From:   <guangming.cao@...iatek.com>
To:     <robin.murphy@....com>
CC:     <Brian.Starkey@....com>, <benjamin.gaignard@...aro.org>,
        <christian.koenig@....com>, <dri-devel@...ts.freedesktop.org>,
        <guangming.cao@...iatek.com>, <john.stultz@...aro.org>,
        <labbott@...hat.com>, <linaro-mm-sig@...ts.linaro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <lmark@...eaurora.org>,
        <matthias.bgg@...il.com>, <sumit.semwal@...aro.org>,
        <wsd_upstream@...iatek.com>, Guangming <Guangming.Cao@...iatek.com>
Subject: [PATCH v2] dma_heap: use for_each_sgtable_sg in sg_table release flow

From: Guangming <Guangming.Cao@...iatek.com>

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.

Signed-off-by: Guangming <Guangming.Cao@...iatek.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..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));
-- 
2.17.1