[PATCH AUTOSEL 6.14 10/34] nvme: requeue namespace scan on missed AENs

Sasha Levin
2025-04-14T13:26:32Z

From: Hannes Reinecke <hare@kernel.org>

[ Upstream commit 9546ad1a9bda7362492114f5866b95b0ac4a100e ]

Scanning for namespaces can take some time, so if the target is
reconfigured while the scan is running we may miss a Attached Namespace
Attribute Changed AEN.

Check if the NVME_AER_NOTICE_NS_CHANGED bit is set once the scan has
finished, and requeue scanning to pick up any missed change.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@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 8359d0aa0e44b..70f9c2d2b1130 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);
}

/*
--
2.39.5