1 files changed, 22 insertions, 11 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 96a991821ae6..31b595479aa5 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -315,8 +315,8 @@ static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
  */
 void mddev_suspend(struct mddev *mddev)
 {
-	BUG_ON(mddev->suspended);
-	mddev->suspended = 1;
+	if (mddev->suspended++)
+		return;
 	synchronize_rcu();
 	wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
 	mddev->pers->quiesce(mddev, 1);
@@ -327,7 +327,8 @@ EXPORT_SYMBOL_GPL(mddev_suspend);
 
 void mddev_resume(struct mddev *mddev)
 {
-	mddev->suspended = 0;
+	if (--mddev->suspended)
+		return;
 	wake_up(&mddev->sb_wait);
 	mddev->pers->quiesce(mddev, 0);
 
@@ -1649,7 +1650,7 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
 			rdev->journal_tail = le64_to_cpu(sb->journal_tail);
 			if (mddev->recovery_cp == MaxSector)
 				set_bit(MD_JOURNAL_CLEAN, &mddev->flags);
-			rdev->raid_disk = mddev->raid_disks;
+			rdev->raid_disk = 0;
 			break;
 		default:
 			rdev->saved_raid_disk = role;
@@ -2770,6 +2771,7 @@ slot_store(struct md_rdev *rdev, const char *buf, size_t len)
 		/* Activating a spare .. or possibly reactivating
 		 * if we ever get bitmaps working here.
 		 */
+		int err;
 
 		if (rdev->raid_disk != -1)
 			return -EBUSY;
@@ -2791,9 +2793,15 @@ slot_store(struct md_rdev *rdev, const char *buf, size_t len)
 			rdev->saved_raid_disk = -1;
 		clear_bit(In_sync, &rdev->flags);
 		clear_bit(Bitmap_sync, &rdev->flags);
-		remove_and_add_spares(rdev->mddev, rdev);
-		if (rdev->raid_disk == -1)
-			return -EBUSY;
+		err = rdev->mddev->pers->
+			hot_add_disk(rdev->mddev, rdev);
+		if (err) {
+			rdev->raid_disk = -1;
+			return err;
+		} else
+			sysfs_notify_dirent_safe(rdev->sysfs_state);
+		if (sysfs_link_rdev(rdev->mddev, rdev))
+			/* failure here is OK */;
 		/* don't wakeup anyone, leave that to userspace. */
 	} else {
 		if (slot >= rdev->mddev->raid_disks &&
@@ -4314,8 +4322,7 @@ action_store(struct mddev *mddev, const char *page, size_t len)
 			}
 			mddev_unlock(mddev);
 		}
-	} else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
-		   test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
+	} else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
 		return -EBUSY;
 	else if (cmd_match(page, "resync"))
 		clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
@@ -4328,8 +4335,12 @@ action_store(struct mddev *mddev, const char *page, size_t len)
 			return -EINVAL;
 		err = mddev_lock(mddev);
 		if (!err) {
-			clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
-			err = mddev->pers->start_reshape(mddev);
+			if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
+				err =  -EBUSY;
+			else {
+				clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
+				err = mddev->pers->start_reshape(mddev);
+			}
 			mddev_unlock(mddev);
 		}
 		if (err)