[PATCH] md/raid5:When exec md_wait_for_blocked_rdev in ops_run_io,we must atomic_inc(&rdev->nr_pending).

[majianpeng <majianpeng@gmail.com>]

In ops_run_io(), if call md_wait_for_blocked_rdev which it dec
nr_pending, the rdev->nr_pending will dec again in else-statement.
So the nr_penging is error and we can't remove this device.

Signed-off-by: majianpeng <majianpeng@gmail.com>
---
 drivers/md/raid5.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index d267672..995b2de 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -607,6 +607,12 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
 					md_check_recovery(conf->mddev);
 				}
 				md_wait_for_blocked_rdev(rdev, conf->mddev);
+				/*
+				 * Because md_wait_for_blocked_rdev will dec
+				 * nr_pending,we must add.The real dec is in
+				 * else statement.
+				 */
+				atomic_inc(&rdev->nr_pending);
 			} else {
 				/* Acknowledged bad block - skip the write */
 				rdev_dec_pending(rdev, conf->mddev);
-- 
1.7.5.4



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majianpeng