[PATCH] md: make sure resync gets started when array starts.

We weren't actually waking up the md thread after setting
MD_RECOVERY_NEEDED when assembling an array, so it is possible to lose a
race and not actually start resync.

So add a call to md_wakeup_thread, and while we are at it, remove all the
"if (mddev->thread)" guards as md_wake_thread does its own checking.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index d4c275604a3e..486ee50cfdda 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -256,8 +256,7 @@ static inline void mddev_unlock(mddev_t * mddev)
 {
         up(&mddev->reconfig_sem);
 
-        if (mddev->thread)
-                md_wakeup_thread(mddev->thread);
+        md_wakeup_thread(mddev->thread);
 }
 
 mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
@@ -1714,6 +1713,7 @@ static int do_md_run(mddev_t * mddev)
         mddev->in_sync = 1;
         
         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+        md_wakeup_thread(mddev->thread);
         
         if (mddev->sb_dirty)
                 md_update_sb(mddev);
@@ -2236,8 +2236,7 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
                         export_rdev(rdev);
 
                 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-                if (mddev->thread)
-                        md_wakeup_thread(mddev->thread);
+                md_wakeup_thread(mddev->thread);
                 return err;
         }