Revert "scatterlist: use sg_phys()"

commit db0fa0cb0157 "scatterlist: use sg_phys()" did replacements of
the form:

    phys_addr_t phys = page_to_phys(sg_page(s));
    phys_addr_t phys = sg_phys(s) & PAGE_MASK;

However, this breaks platforms where sizeof(phys_addr_t) >
sizeof(unsigned long).  Revert for 4.3 and 4.4 to make room for a
combined helper in 4.5.

Cc: <stable@vger.kernel.org>
Cc: Jens Axboe <axboe@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Fixes: db0fa0cb0157 ("scatterlist: use sg_phys()")
Suggested-by: Joerg Roedel <joro@8bytes.org>
Reported-by: Vitaly Lavrov <vel21ripn@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index f1042daef9ad..ac7387686ddc 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2159,7 +2159,7 @@ static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
                         sg_res = aligned_nrpages(sg->offset, sg->length);
                         sg->dma_address = ((dma_addr_t)iov_pfn << VTD_PAGE_SHIFT) + sg->offset;
                         sg->dma_length = sg->length;
-                        pteval = (sg_phys(sg) & PAGE_MASK) | prot;
+                        pteval = page_to_phys(sg_page(sg)) | prot;
                         phys_pfn = pteval >> VTD_PAGE_SHIFT;
                 }
 
@@ -3704,7 +3704,7 @@ static int intel_nontranslate_map_sg(struct device *hddev,
 
         for_each_sg(sglist, sg, nelems, i) {
                 BUG_ON(!sg_page(sg));
-                sg->dma_address = sg_phys(sg);
+                sg->dma_address = page_to_phys(sg_page(sg)) + sg->offset;
                 sg->dma_length = sg->length;
         }
         return nelems;