From: Hannes Reinecke <hare@suse.de>
Date: Wed, 26 May 2021 15:23:17 +0000 (+0200)
Subject: nvme-loop: check for NVME_LOOP_Q_LIVE in nvme_loop_destroy_admin_queue()
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=4237de2f73a669e4f89ac0aa2b44fb1a1d9ec583;p=uclinux-h8%2Flinux.git

nvme-loop: check for NVME_LOOP_Q_LIVE in nvme_loop_destroy_admin_queue()

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>
---

diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index 8643c71953ad..209ad4bc2695 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -263,7 +263,8 @@ 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_cleanup_queue(ctrl->ctrl.fabrics_q);