1 files changed, 3 insertions, 2 deletions

diff --git a/arch/ppc/kernel/pci.c b/arch/ppc/kernel/pci.c
index ad4ef2aaa6ab..e8f4e576750a 100644
--- a/arch/ppc/kernel/pci.c
+++ b/arch/ppc/kernel/pci.c
@@ -1594,16 +1594,17 @@ static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp,
  * above routine
  */
 pgprot_t pci_phys_mem_access_prot(struct file *file,
-                                  unsigned long offset,
+                                  unsigned long pfn,
                                   unsigned long size,
                                   pgprot_t protection)
 {
         struct pci_dev *pdev = NULL;
         struct resource *found = NULL;
         unsigned long prot = pgprot_val(protection);
+        unsigned long offset = pfn << PAGE_SHIFT;
         int i;
 
-        if (page_is_ram(offset >> PAGE_SHIFT))
+        if (page_is_ram(pfn))
                 return prot;
 
         prot |= _PAGE_NO_CACHE | _PAGE_GUARDED;