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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Hannes Reinecke <hare@suse.de>,
        Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>,
        Christoph Hellwig <hch@lst.de>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 12/88] nvme-loop: check for NVME_LOOP_Q_LIVE in nvme_loop_destroy_admin_queue()
Date:   Mon, 28 Jun 2021 10:35:12 -0400
Message-Id: <20210628143628.33342-13-sashal@kernel.org>
In-Reply-To: <20210628143628.33342-1-sashal@kernel.org>
References: <20210628143628.33342-1-sashal@kernel.org>
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From: Hannes Reinecke <hare@suse.de>

[ Upstream commit 4237de2f73a669e4f89ac0aa2b44fb1a1d9ec583 ]

We need to check the NVME_LOOP_Q_LIVE flag in
nvme_loop_destroy_admin_queue() to protect against duplicate
invocations eg during concurrent reset and remove calls.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/nvme/target/loop.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index 963d8de932d1..7a0a10777cd1 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -287,7 +287,8 @@ static const struct blk_mq_ops nvme_loop_admin_mq_ops = {
 
 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl)
 {
-	clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags);
+	if (!test_and_clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags))
+		return;
 	nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
 	blk_cleanup_queue(ctrl->ctrl.admin_q);
 	blk_mq_free_tag_set(&ctrl->admin_tag_set);
-- 
2.30.2