linux-kernel - [PATCH 2/2] udmabuf: fix vmap missed offset page

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Message-ID: <20250415031548.2007942-3-link@vivo.com>
Date: Tue, 15 Apr 2025 11:15:47 +0800
From: Huan Yang <link@...o.com>
To: Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Gerd Hoffmann <kraxel@...hat.com>,
	Vivek Kasireddy <vivek.kasireddy@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Airlie <airlied@...hat.com>,
	linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org,
	linux-kernel@...r.kernel.org
Cc: opensource.kernel@...o.com,
	Huan Yang <link@...o.com>
Subject: [PATCH 2/2] udmabuf: fix vmap missed offset page

Before invoke vmap, we need offer a pages pointer array which each page
need to map in vmalloc area.

But currently vmap_udmabuf only set each folio's head page into pages,
missed each offset pages when iter.

This patch set the correctly offset page in each folio into array.

Signed-off-by: Huan Yang <link@...o.com>
Fixes: 5e72b2b41a21 ("udmabuf: convert udmabuf driver to use folios")
---
 drivers/dma-buf/udmabuf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index 79845565089d..af5200e360a6 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -120,7 +120,8 @@ static int vmap_udmabuf(struct dma_buf *buf, struct iosys_map *map)
 		return -ENOMEM;
 
 	for (pg = 0; pg < ubuf->pagecount; pg++)
-		pages[pg] = &ubuf->folios[pg]->page;
+		pages[pg] = folio_page(ubuf->folios[pg],
+				       ubuf->offsets[pg] >> PAGE_SHIFT);
 
 	vaddr = vm_map_ram(pages, ubuf->pagecount, -1);
 	kvfree(pages);
-- 
2.48.1