[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 <jslaby@suse.cz> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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@ -300,7 +300,7 @@ static int __videobuf_mmap_mapper(struct videobuf_queue *q,
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vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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retval = remap_pfn_range(vma, vma->vm_start,
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mem->dma_handle >> PAGE_SHIFT,
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PFN_DOWN(virt_to_phys(mem->vaddr)),
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size, vma->vm_page_prot);
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if (retval) {
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dev_err(q->dev, "mmap: remap failed with error %d. ", retval);
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