linux-kernel - [PATCH 1/2] udmabuf: fix vmap

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Message-ID: <20240731090233.1343559-1-link@vivo.com>
Date: Wed, 31 Jul 2024 17:02:32 +0800
From: Huan Yang <link@...o.com>
To: Gerd Hoffmann <kraxel@...hat.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	dri-devel@...ts.freedesktop.org,
	linux-media@...r.kernel.org,
	linaro-mm-sig@...ts.linaro.org,
	linux-kernel@...r.kernel.org
Cc: opensource.kernel@...o.com,
	Huan Yang <link@...o.com>
Subject: [PATCH 1/2] udmabuf: fix vmap_udmabuf error page set

Currently vmap_udmabuf set page's array by each folio.
But, ubuf->folios is only contain's the folio's head page.

That mean we repeatedly mapped the folio head page to the vmalloc area.

This patch fix it, set each folio's page correct, so that pages array
contains right page, and then map into vmalloc area

Signed-off-by: Huan Yang <link@...o.com>
---
 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 047c3cd2ceff..6604d91e7072 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -85,7 +85,8 @@ 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);
 	kfree(pages);

base-commit: cd19ac2f903276b820f5d0d89de0c896c27036ed
-- 
2.45.2