[PATCH 6.1.y v2 6/6] nvme: fix admin queue leak on controller reset

["Heyne, Maximilian" <mheyne@amazon.de>]

From: Ming Lei <ming.lei@redhat.com>

[ Upstream commit b84bb7bd913d8ca2f976ee6faf4a174f91c02b8d ]

When nvme_alloc_admin_tag_set() is called during a controller reset,
a previous admin queue may still exist. Release it properly before
allocating a new one to avoid orphaning the old queue.

This fixes a regression introduced by commit 03b3bcd319b3 ("nvme: fix
admin request_queue lifetime").

Cc: Keith Busch <kbusch@kernel.org>
Fixes: 03b3bcd319b3 ("nvme: fix admin request_queue lifetime").
Reported-and-tested-by: Yi Zhang <yi.zhang@redhat.com>
Closes: https://lore.kernel.org/linux-block/CAHj4cs9wv3SdPo+N01Fw2SHBYDs9tj2M_e1-GdQOkRy=DsBB1w@mail.gmail.com/
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
[ Have to do analogous work in nvme_pci_alloc_admin_tag_set in pci.c due
  to missing upstream commit 0da7feaa5913 ("nvme-pci: use the tagset
  alloc/free helpers") ]
Signed-off-by: Maximilian Heyne <mheyne@amazon.de>
---
 drivers/nvme/host/core.c | 7 +++++++
 drivers/nvme/host/pci.c  | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index f17318f6c82b0..09439fa7d083a 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -5012,6 +5012,13 @@ int nvme_alloc_admin_tag_set(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set,
 	if (ret)
 		return ret;
 
+	/*
+	 * If a previous admin queue exists (e.g., from before a reset),
+	 * put it now before allocating a new one to avoid orphaning it.
+	 */
+	if (ctrl->admin_q)
+		blk_put_queue(ctrl->admin_q);
+
 	ctrl->admin_q = blk_mq_init_queue(set);
 	if (IS_ERR(ctrl->admin_q)) {
 		ret = PTR_ERR(ctrl->admin_q);
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index e8b7b0004086c..07ca1e1d920b8 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1804,6 +1804,13 @@ static int nvme_pci_alloc_admin_tag_set(struct nvme_dev *dev)
 		return -ENOMEM;
 	dev->ctrl.admin_tagset = set;
 
+	/*
+	 * If a previous admin queue exists (e.g., from before a reset),
+	 * put it now before allocating a new one to avoid orphaning it.
+	 */
+	if (dev->ctrl.admin_q)
+		blk_put_queue(dev->ctrl.admin_q);
+
 	dev->ctrl.admin_q = blk_mq_init_queue(set);
 	if (IS_ERR(dev->ctrl.admin_q)) {
 		blk_mq_free_tag_set(set);
-- 
2.50.1




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