nd_activate_region() iomaps any hint addresses required when activating
a region. To prevent duplicate mappings it checks the PFN of the hint to
be mapped against the PFNs of the already mapped hints. Unfortunately it
doesn't convert the PFN back into a physical address before passing it
to devm_nvdimm_ioremap(). Instead it applies PHYS_PFN a second time
which ends about as well as you would imagine.

Signed-off-by: Oliver O'Halloran <ooh...@gmail.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
---
 drivers/nvdimm/region_devs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index e8d5ba7b29af..4eef88eb5144 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -57,7 +57,7 @@ static int nvdimm_map_flush(struct device *dev, struct nvdimm 
*nvdimm, int dimm,
                                        ndrd->flush_wpq[dimm][j] & PAGE_MASK);
                else
                        flush_page = devm_nvdimm_ioremap(dev,
-                                       PHYS_PFN(pfn), PAGE_SIZE);
+                                       PFN_PHYS(pfn), PAGE_SIZE);
                if (!flush_page)
                        return -ENXIO;
                ndrd->flush_wpq[dimm][i] = flush_page
-- 
2.5.5

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