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>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 21a90ef..b572e1e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8021,7 +8021,7 @@
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++) {