linux-kernel - [PATCH AUTOSEL 5.15 07/15] nvme: re-read ANA log page after ns scan completes

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Message-Id: <20250414133126.680846-7-sashal@kernel.org>
Date: Mon, 14 Apr 2025 09:31:17 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Hannes Reinecke <hare@...nel.org>,
	Keith Busch <kbusch@...nel.org>,
	Christoph Hellwig <hch@....de>,
	Sasha Levin <sashal@...nel.org>,
	sagi@...mberg.me,
	linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.15 07/15] nvme: re-read ANA log page after ns scan completes

From: Hannes Reinecke <hare@...nel.org>

[ Upstream commit 62baf70c327444338c34703c71aa8cc8e4189bd6 ]

When scanning for new namespaces we might have missed an ANA AEN.

The NVMe base spec (NVMe Base Specification v2.1, Figure 151 'Asynchonous
Event Information - Notice': Asymmetric Namespace Access Change) states:

  A controller shall not send this even if an Attached Namespace
  Attribute Changed asynchronous event [...] is sent for the same event.

so we need to re-read the ANA log page after we rescanned the namespace
list to update the ANA states of the new namespaces.

Signed-off-by: Hannes Reinecke <hare@...nel.org>
Reviewed-by: Keith Busch <kbusch@...nel.org>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 85d965fe8838c..68d4546dda3bb 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4225,6 +4225,11 @@ static void nvme_scan_work(struct work_struct *work)
 	/* Requeue if we have missed AENs */
 	if (test_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events))
 		nvme_queue_scan(ctrl);
+#ifdef CONFIG_NVME_MULTIPATH
+	else
+		/* Re-read the ANA log page to not miss updates */
+		queue_work(nvme_wq, &ctrl->ana_work);
+#endif
 }
 
 /*
-- 
2.39.5