[PATCHv2] nvme: send uevent once a multipath namespace is operational again

[Hannes Reinecke]

In an all paths down scenario I/O will be requeued or aborted, and no
further I/O will be ongoing on this namespace.
This leaves the upper layers unable to determine if the namespace
becomes operational again eg. after a successful controller reset.
With this patch a 'change' uevent will be sent per multipathed namespace
once the underlying controller moved to LIVE and started I/O processing
by calling nvme_kick_requeue_lists().

Signed-off-by: Hannes Reinecke <hare at suse.de>
---
 drivers/nvme/host/multipath.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 0696319adaf6..1a9e14ebe11b 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -97,8 +97,11 @@ 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)
+			disk_uevent(ns->head->disk, KOBJ_CHANGE);
 	}
 	up_read(&ctrl->namespaces_rwsem);
 }
-- 
2.29.2