md: notify level changes through sysfs.

Level changes can be very significant, so make sure
to notify them via sysfs.

Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 46bdf4b38be8..c5a1b0725c9f 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3059,6 +3059,7 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
         set_bit(MD_CHANGE_DEVS, &mddev->flags);
         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
         md_wakeup_thread(mddev->thread);
+        sysfs_notify(&mddev->kobj, NULL, "level");
         return rv;
 }