linux-kernel - [PATCH 1/5] nvme-fc: don't hold rport lock when putting ctrl

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Message-Id: <20251028-nvmet-fcloop-fixes-v1-1-765427148613@kernel.org>
Date: Tue, 28 Oct 2025 16:26:20 +0100
From: Daniel Wagner <wagi@...nel.org>
To: Justin Tee <justin.tee@...adcom.com>, Christoph Hellwig <hch@....de>, 
 Keith Busch <kbusch@...nel.org>
Cc: James Smart <james.smart@...adcom.com>, Jens Axboe <axboe@...nel.dk>, 
 linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Daniel Wagner <wagi@...nel.org>
Subject: [PATCH 1/5] nvme-fc: don't hold rport lock when putting ctrl

nvme_fc_ctrl_put can acquire the rport lock when freeing the
ctrl object:

nvme_fc_ctrl_put
  nvme_fc_ctrl_free
    spin_lock_irqsave(rport->lock)

Thus we can't hold the rport lock when calling nvme_fc_ctrl_put.

Signed-off-by: Daniel Wagner <wagi@...nel.org>
---
 drivers/nvme/host/fc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 03987f497a5b..2c0ea843ae57 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -1488,7 +1488,9 @@ nvme_fc_match_disconn_ls(struct nvme_fc_rport *rport,
 		if (ret)
 			/* leave the ctrl get reference */
 			break;
+		spin_unlock_irqrestore(&rport->lock, flags);
 		nvme_fc_ctrl_put(ctrl);
+		spin_lock_irqsave(&rport->lock, flags);
 	}
 
 	spin_unlock_irqrestore(&rport->lock, flags);

-- 
2.51.0