ceph: move dereference after NULL test

Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 25360d517d1..23bb0ceabe3 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -144,7 +144,7 @@ static int ceph_set_page_dirty(struct page *page)
  */
 static void ceph_invalidatepage(struct page *page, unsigned long offset)
 {
-        struct inode *inode = page->mapping->host;
+        struct inode *inode;
         struct ceph_inode_info *ci;
         struct ceph_snap_context *snapc = (void *)page->private;
 
@@ -153,6 +153,8 @@ static void ceph_invalidatepage(struct page *page, unsigned long offset)
         BUG_ON(!PagePrivate(page));
         BUG_ON(!page->mapping);
 
+        inode = page->mapping->host;
+
         /*
          * We can get non-dirty pages here due to races between
          * set_page_dirty and truncate_complete_page; just spit out a