mm/mmap.c: remove the first mapping check

Remove the first mapping check for vma_link.  Move the mutex_lock into the
braces when vma->vm_file is true.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 6cdec3a6f4bf..8a56d39df4ed 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -640,11 +640,10 @@ static void vma_link(struct mm_struct *mm, struct vm_area_struct *vma,
 {
         struct address_space *mapping = NULL;
 
-        if (vma->vm_file)
+        if (vma->vm_file) {
                 mapping = vma->vm_file->f_mapping;
-
-        if (mapping)
                 mutex_lock(&mapping->i_mmap_mutex);
+        }
 
         __vma_link(mm, vma, prev, rb_link, rb_parent);
         __vma_link_file(vma);