linux-kernel - [PATCH 4.2 032/124] ARM: 8427/1: dma-mapping: add support for offset parameter in dma

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Date:	Mon,  7 Dec 2015 09:55:22 -0500
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [PATCH 4.2 032/124] ARM: 8427/1: dma-mapping: add support for offset parameter in dma_mmap()

4.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marek Szyprowski <m.szyprowski@...sung.com>

commit 7e31210349e9e03a9a4dff31ab5f2bc83e8e84f5 upstream.

IOMMU-based dma_mmap() implementation lacked proper support for offset
parameter used in mmap call (it always assumed that mapping starts from
offset zero). This patch adds support for offset parameter to IOMMU-based
implementation.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/mm/dma-mapping.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1424,6 +1424,8 @@ static int arm_iommu_mmap_attrs(struct d
 	if (off >= nr_pages || (usize >> PAGE_SHIFT) > nr_pages - off)
 		return -ENXIO;
 
+	pages += off;
+
 	do {
 		int ret = vm_insert_page(vma, uaddr, *pages++);
 		if (ret) {


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