Messages in this thread | | | Date | Mon, 28 Feb 2011 09:53:01 -0500 | From | Konrad Rzeszutek Wilk <> | Subject | Re: [PATCH v2 -resend#1 1/1] V4L: videobuf, don't use dma addr as physical |
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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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