From: Jiri Slaby Date: Mon, 28 Feb 2011 09:37:02 +0000 (-0300) Subject: [media] V4L: videobuf, don't use dma addr as physical X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=35d9f510b67b10338161aba6229d4f55b4000f5b;p=linux-edison.git [media] 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, as a hardware IOMMU can (and most likely) will return a bus address where physical != bus address. 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. [mchehab@redhat.com: Fix compilation breakage due to the lack of a comma] Signed-off-by: Jiri Slaby Reviewed-by: Konrad Rzeszutek Wilk Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/videobuf-dma-contig.c b/drivers/media/video/videobuf-dma-contig.c index c9691115f2d..c4742fc1552 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);