[JFFS2] Calculate CRC check starting point correctly

When data starts from the beginning of NAND page, 'len' must be zero, not
c->wbuf_page.

Thanks to Zoltan Sogor for reporting this problem.

Signed-off-by: Artem B. Bityutskiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/jffs2/nodelist.c b/fs/jffs2/nodelist.c
index 0393d27eafc7..fd21f109fbd2 100644
--- a/fs/jffs2/nodelist.c
+++ b/fs/jffs2/nodelist.c
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: nodelist.c,v 1.110 2005/08/17 14:13:45 dedekind Exp $
+ * $Id: nodelist.c,v 1.111 2005/08/17 14:57:39 dedekind Exp $
  *
  */
 
@@ -413,7 +413,8 @@ static int check_node_data(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info
         /* Calculate how many bytes were already checked */
         ofs = ref_offset(ref) + sizeof(struct jffs2_raw_inode);
         len = ofs & (c->wbuf_pagesize - 1);
-        len = c->wbuf_pagesize - len;
+        if (likely(len))
+                len = c->wbuf_pagesize - len;
 
         if (len >= tn->csize) {
                 JFFS2_DBG_READINODE("no need to check node at %#08x, data length %u, data starts at %#08x - it has already been checked.\n",