[PATCH 5.4 19/28] nvme-loop: reset queue count to 1 in nvme_loop_destroy_io_queues()

From: Greg Kroah-Hartman
Date: Wed Jun 16 2021 - 11:34:43 EST


From: Hannes Reinecke <hare@xxxxxxx>

[ Upstream commit a6c144f3d2e230f2b3ac5ed8c51e0f0391556197 ]

The queue count is increased in nvme_loop_init_io_queues(), so we
need to reset it to 1 at the end of nvme_loop_destroy_io_queues().
Otherwise the function is not re-entrant safe, and crash will happen
during concurrent reset and remove calls.

Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/nvme/target/loop.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index 82b87a4c50f6..b4f5503ae570 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -288,6 +288,7 @@ static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl)
clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags);
nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
}
+ ctrl->ctrl.queue_count = 1;
}

static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl)
--
2.30.2