linux-kernel - [PATCH v2 1/1] V4L: videobuf, don't use dma addr as physical

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Message-Id: <1291666396-23493-1-git-send-email-jslaby@suse.cz>
Date:	Mon,  6 Dec 2010 21:13:16 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	mchehab@...radead.org
Cc:	linux-media@...r.kernel.org, iommu@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH v2 1/1] V4L: videobuf, don't use dma addr as physical

mem->dma_handle is a dma address obtained by dma_alloc_coherent which
needn't be a physical address in presence of IOMMU. So ensure we are
remapping (remap_pfn_range) the right page in __videobuf_mmap_mapper
by using virt_to_phys(mem->vaddr) and not mem->dma_handle.

While at it, use PFN_DOWN instead of explicit shift.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Mauro Carvalho Chehab <mchehab@...radead.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
 drivers/media/video/videobuf-dma-contig.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/media/video/videobuf-dma-contig.c b/drivers/media/video/videobuf-dma-contig.c
index c969111..19d3e4a 100644
--- a/drivers/media/video/videobuf-dma-contig.c
+++ b/drivers/media/video/videobuf-dma-contig.c
@@ -300,7 +300,7 @@ static int __videobuf_mmap_mapper(struct videobuf_queue *q,
 
 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 	retval = remap_pfn_range(vma, vma->vm_start,
-				 mem->dma_handle >> PAGE_SHIFT,
+				 PFN_DOWN(virt_to_phys(mem->vaddr))
 				 size, vma->vm_page_prot);
 	if (retval) {
 		dev_err(q->dev, "mmap: remap failed with error %d. ", retval);
-- 
1.7.3.1


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