drivers: base: dma-mapping: use nth_page helper

Use nth_page() helper instead of page_to_pfn() and pfn_to_page() to
simplify the code.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
index efd71cf4fdea..51b7061ff7c0 100644
--- a/drivers/base/dma-mapping.c
+++ b/drivers/base/dma-mapping.c
@@ -309,14 +309,13 @@ void *dma_common_contiguous_remap(struct page *page, size_t size,
         int i;
         struct page **pages;
         void *ptr;
-        unsigned long pfn;
 
         pages = kmalloc(sizeof(struct page *) << get_order(size), GFP_KERNEL);
         if (!pages)
                 return NULL;
 
-        for (i = 0, pfn = page_to_pfn(page); i < (size >> PAGE_SHIFT); i++)
-                pages[i] = pfn_to_page(pfn + i);
+        for (i = 0; i < (size >> PAGE_SHIFT); i++)
+                pages[i] = nth_page(page, i);
 
         ptr = dma_common_pages_remap(pages, size, vm_flags, prot, caller);