linux-kernel - [PATCH AUTOSEL 6.6 30/39] Revert "nvme-fc: fix race between error recovery and creating association"

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Message-ID: <20231226002021.4776-30-sashal@kernel.org>
Date: Mon, 25 Dec 2023 19:19:20 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Keith Busch <kbusch@...nel.org>,
	Daniel Wagner <dwagner@...e.de>,
	Maurizio Lombardi <mlombard@...hat.com>,
	Michael Liang <mliang@...estorage.com>,
	Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	Sasha Levin <sashal@...nel.org>,
	james.smart@...adcom.com,
	linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.6 30/39] Revert "nvme-fc: fix race between error recovery and creating association"

From: Keith Busch <kbusch@...nel.org>

[ Upstream commit d3e8b1858734bf46cda495be4165787b9a3981a6 ]

The commit was identified to might sleep in invalid context and is
blocking regression testing.

This reverts commit ee6fdc5055e916b1dd497f11260d4901c4c1e55e.

Link: https://lore.kernel.org/linux-nvme/hkhl56n665uvc6t5d6h3wtx7utkcorw4xlwi7d2t2bnonavhe6@xaan6pu43ap6/
Link: https://lists.infradead.org/pipermail/linux-nvme/2023-December/043756.html
Reported-by: Daniel Wagner <dwagner@...e.de>
Reported-by: Maurizio Lombardi <mlombard@...hat.com>
Cc: Michael Liang <mliang@...estorage.com>
Tested-by: Daniel Wagner <dwagner@...e.de>
Reviewed-by: Daniel Wagner <dwagner@...e.de>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
Signed-off-by: Keith Busch <kbusch@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/fc.c | 21 +++++----------------
 1 file changed, 5 insertions(+), 16 deletions(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index a15b37750d6e9..206f1b4e5eb1c 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -2548,24 +2548,17 @@ nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg)
 	 * the controller.  Abort any ios on the association and let the
 	 * create_association error path resolve things.
 	 */
-	enum nvme_ctrl_state state;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ctrl->lock, flags);
-	state = ctrl->ctrl.state;
-	if (state == NVME_CTRL_CONNECTING) {
-		set_bit(ASSOC_FAILED, &ctrl->flags);
-		spin_unlock_irqrestore(&ctrl->lock, flags);
+	if (ctrl->ctrl.state == NVME_CTRL_CONNECTING) {
 		__nvme_fc_abort_outstanding_ios(ctrl, true);
+		set_bit(ASSOC_FAILED, &ctrl->flags);
 		dev_warn(ctrl->ctrl.device,
 			"NVME-FC{%d}: transport error during (re)connect\n",
 			ctrl->cnum);
 		return;
 	}
-	spin_unlock_irqrestore(&ctrl->lock, flags);
 
 	/* Otherwise, only proceed if in LIVE state - e.g. on first error */
-	if (state != NVME_CTRL_LIVE)
+	if (ctrl->ctrl.state != NVME_CTRL_LIVE)
 		return;
 
 	dev_warn(ctrl->ctrl.device,
@@ -3179,16 +3172,12 @@ nvme_fc_create_association(struct nvme_fc_ctrl *ctrl)
 		else
 			ret = nvme_fc_recreate_io_queues(ctrl);
 	}
-
-	spin_lock_irqsave(&ctrl->lock, flags);
 	if (!ret && test_bit(ASSOC_FAILED, &ctrl->flags))
 		ret = -EIO;
-	if (ret) {
-		spin_unlock_irqrestore(&ctrl->lock, flags);
+	if (ret)
 		goto out_term_aen_ops;
-	}
+
 	changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
-	spin_unlock_irqrestore(&ctrl->lock, flags);
 
 	ctrl->ctrl.nr_reconnects = 0;
 
-- 
2.43.0