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drivers: base: dma-mapping: use nth_page helper

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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>
This commit is contained in:
Geliang Tang 2017-03-24 22:10:49 +08:00 committed by Greg Kroah-Hartman
parent a2b60670ac
commit 0dd8911961
1 changed files with 2 additions and 3 deletions
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5
drivers/base/dma-mapping.c
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@ -309,14 +309,13 @@ void *dma_common_contiguous_remap(struct page *page, size_t size,
int i; int i;
struct page **pages; struct page **pages;
void *ptr; void *ptr;
unsigned long pfn;
pages = kmalloc(sizeof(struct page *) << get_order(size), GFP_KERNEL); pages = kmalloc(sizeof(struct page *) << get_order(size), GFP_KERNEL);
if (!pages) if (!pages)
return NULL; return NULL;
for (i = 0, pfn = page_to_pfn(page); i < (size >> PAGE_SHIFT); i++) for (i = 0; i < (size >> PAGE_SHIFT); i++)
pages[i] = pfn_to_page(pfn + i); pages[i] = nth_page(page, i);
ptr = dma_common_pages_remap(pages, size, vm_flags, prot, caller); ptr = dma_common_pages_remap(pages, size, vm_flags, prot, caller);