linux-kernel - [PATCH] dma_heap: use sg_table.orig_nents in sg

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Message-ID: <20211125124626.60068-1-guangming.cao@mediatek.com>
Date:   Thu, 25 Nov 2021 20:46:25 +0800
From:   <guangming.cao@...iatek.com>
To:     Sumit Semwal <sumit.semwal@...aro.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        "Laura Abbott" <labbott@...hat.com>,
        Brian Starkey <Brian.Starkey@....com>,
        "John Stultz" <john.stultz@...aro.org>,
        Christian König <christian.koenig@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "open list:DMA-BUF HEAPS FRAMEWORK" <linux-media@...r.kernel.org>,
        "open list:DMA-BUF HEAPS FRAMEWORK" <dri-devel@...ts.freedesktop.org>,
        "moderated list:DMA-BUF HEAPS FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
CC:     <wsd_upstream@...iatek.com>, Guangming <Guangming.Cao@...iatek.com>
Subject: [PATCH] dma_heap: use sg_table.orig_nents in sg_table release flow

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