[PATCH] drivers: base: dma-mapping: use nth_page helper
From: Geliang Tang
Date: Fri Mar 24 2017 - 10:11:57 EST
Use nth_page() helper instead of page_to_pfn() and pfn_to_page() to
simplify the code.
Signed-off-by: Geliang Tang <geliangtang@xxxxxxxxx>
---
drivers/base/dma-mapping.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
index efd71cf..51b7061 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);
--
2.9.3