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SubjectRe: [PATCH v2 -resend#1 1/1] V4L: videobuf, don't use dma addr as physical
On Mon, Feb 28, 2011 at 10:37:02AM +0100, Jiri Slaby wrote:
> 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

Can you add a comment why you are fixing it? Is there a bug report for this?
Under what conditions did you expose this fault?

You also might want to mention that "needn't be a physical address as
a hardware IOMMU can (and most likely) will return a bus address where
physical != bus address."

Otherwise you can stick 'Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>'
on it.

> 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@suse.cz>
> Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.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);
> --
> 1.7.4.1
>


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