[PATCH] md/raid5:Add "BlockedBadBlocks" flag when waitting rdev to be unlocked.

[majianpeng <majianpeng@gmail.com>]

If rdev became blocked because the unack badblocks, it did not exec 
md_wait_for_blocked_rdev in handle_stripe().So the rdev->nr_pending did
not decrease.So rdev did not remove because the wrong nr_pending.
Signed-off-by: majianpeng <majianpeng@gmail.com>
---
 drivers/md/raid5.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index d267672..ed63261 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3582,7 +3582,8 @@ static void handle_stripe(struct stripe_head *sh)
 
 finish:
 	/* wait for this device to become unblocked */
-	if (conf->mddev->external && unlikely(s.blocked_rdev))
+	if (unlikely(s.blocked_rdev) && (conf->mddev->external ||
+		test_bit(BlockedBadBlocks, &(s.blocked_rdev->flags))))
 		md_wait_for_blocked_rdev(s.blocked_rdev, conf->mddev);
 
 	if (s.handle_bad_blocks)
-- 
1.7.5.4