[PATCH 4/5] nvme: requeue namespace scan on missed AENs

[Hannes Reinecke <hare@kernel.org>]

From: Hannes Reinecke <hare@suse.de>

Scanning for namespaces can take some time, so if the target is
reconfigured while the scan is running we will miss the AEN.
So check if the NVME_AER_NOTICE_NS_CHANGED bit is set once the scan is
finished, and requeue scanning to pick up any missed changes.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
---
 drivers/nvme/host/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 8359d0aa0e44..70f9c2d2b113 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4292,6 +4292,10 @@ static void nvme_scan_work(struct work_struct *work)
 			nvme_scan_ns_sequential(ctrl);
 	}
 	mutex_unlock(&ctrl->scan_lock);
+
+	/* Requeue if we have missed AENs */
+	if (test_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events))
+		nvme_queue_scan(ctrl);
 }
 
 /*
-- 
2.35.3