3.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: majianpeng <redacted>

commit ab05613a0646dcc11049692d54bae76ca9ffa910 upstream.

This bug was introduced by commit(v3.0-rc7-126-g2230dfe).
So fix is suitable for 3.0.y thru 3.6.y.

Signed-off-by: Jianpeng Ma <redacted>
Signed-off-by: NeilBrown <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/md.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/md/md.c
+++ b/drivers/md/md.c

@@ -7907,9 +7907,9 @@ int md_is_badblock(struct badblocks *bb,
 		   sector_t *first_bad, int *bad_sectors)
 {
 	int hi;
-	int lo = 0;
+	int lo;
 	u64 *p = bb->page;
-	int rv = 0;
+	int rv;
 	sector_t target = s + sectors;
 	unsigned seq;
 

@@ -7924,7 +7924,8 @@ int md_is_badblock(struct badblocks *bb,
 
 retry:
 	seq = read_seqbegin(&bb->lock);
-
+	lo = 0;
+	rv = 0;
 	hi = bb->count;
 
 	/* Binary search between lo and hi for 'target'