This additional notification to 'array_state' is needed to allow the monitor
application to learn about stop events via sysfs.  The
sysfs_notify("sync_action") call that comes at the end of do_md_stop() (via
md_new_event) is insufficient since the 'sync_action' attribute has been
removed by this point.

(Seems like a sysfs-notify-on-removal patch is a better fix.  Currently removal
 updates the event count but does not wake up waiters)

Signed-off-by: Dan Williams <redacted>
---

 drivers/md/md.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index ad53035..606c8ee 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c

@@ -3693,6 +3693,9 @@ static int do_md_stop(mddev_t * mddev, int mode)
 
 			module_put(mddev->pers->owner);
 			mddev->pers = NULL;
+			/* tell userspace to handle 'inactive' */
+			if (mddev->external)
+				sysfs_notify(&mddev->kobj, NULL, "array_state");
 
 			set_capacity(disk, 0);
 			mddev->changed = 1;