[PATCH] nvme: generate uevent once a multipath namespace is operational again

[Hannes Reinecke]

In an all paths down scenario I/O will be requeued or aborted, so no
further I/O will be ongoing on this namespace.
This leaves upper layers like MD unable to determine if the namespace
becomes operational again after a successful controller reset.
This patch will send an uevent per multipathed namespace once the
underlying controller is LIVE, allowing MD to start resync.

Signed-off-by: Hannes Reinecke <hare at suse.de>
---
 drivers/nvme/host/multipath.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 0551796517e6..f099897aea59 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -100,8 +100,12 @@ void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
 
 	down_read(&ctrl->namespaces_rwsem);
 	list_for_each_entry(ns, &ctrl->namespaces, list) {
-		if (ns->head->disk)
-			kblockd_schedule_work(&ns->head->requeue_work);
+		if (!ns->head->disk)
+			continue;
+		kblockd_schedule_work(&ns->head->requeue_work);
+		if (ctrl->state == NVME_CTRL_LIVE)
+			kobject_uevent(&disk_to_dev(ns->head->disk)->kobj,
+				       KOBJ_CHANGE);
 	}
 	up_read(&ctrl->namespaces_rwsem);
 }
-- 
2.29.2