From ecb178bb2b154a40cfae9fa4c42e62ccfa81ac6b Mon Sep 17 00:00:00 2001
From: majianpeng <majianpeng@gmail.com>
Date: Mon, 19 Mar 2012 12:46:42 +1100
Subject: [PATCH] md: Add judgement bb->unacked_exist in function
 md_ack_all_badblocks().

If there are no unacked bad blocks, then there is no point searching
for them to acknowledge them.


Signed-off-by: majianpeng <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
---
 drivers/md/md.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 21a90efb13b7..b572e1e386ce 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8021,7 +8021,7 @@ void md_ack_all_badblocks(struct badblocks *bb)
 		return;
 	write_seqlock_irq(&bb->lock);
 
-	if (bb->changed == 0) {
+	if (bb->changed == 0 && bb->unacked_exist) {
 		u64 *p = bb->page;
 		int i;
 		for (i = 0; i < bb->count ; i++) {