drivers: dma-coherent: use vma_pages().

Replace explicit computation of vma page count by a call to
vma_pages()

Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c
index bdf28f7dd5e8..db122a06edc5 100644
--- a/drivers/base/dma-coherent.c
+++ b/drivers/base/dma-coherent.c
@@ -261,7 +261,7 @@ int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma,
                    (mem->virt_base + (mem->size << PAGE_SHIFT))) {
                 unsigned long off = vma->vm_pgoff;
                 int start = (vaddr - mem->virt_base) >> PAGE_SHIFT;
-                int user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+                int user_count = vma_pages(vma);
                 int count = size >> PAGE_SHIFT;
 
                 *ret = -ENXIO;