[PATCH 5.8 118/118] nvme-loop: set ctrl state connecting after init

Greg Kroah-Hartman
2020-09-21T16:47:42Z

From: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>

commit 64d452b3560b7a55277c8d9ef0a8635e62136580 upstream.

When creating a loop controller (ctrl) in nvme_loop_create_ctrl() ->
nvme_init_ctrl() we set the ctrl state to NVME_CTRL_NEW.

Prior to [1] NVME_CTRL_NEW state was allowed in nvmf_check_ready() for
fabrics command type connect. Now, this fails in the following code path
for fabrics connect command when creating admin queue :-

nvme_loop_create_ctrl()
nvme_loo_configure_admin_queue()
nvmf_connect_admin_queue()
__nvme_submit_sync_cmd()
blk_execute_rq()
nvme_loop_queue_rq()
nvmf_check_ready()

# echo "transport=loop,nqn=fs" > /dev/nvme-fabrics
[ 6047.741327] nvmet: adding nsid 1 to subsystem fs
[ 6048.756430] nvme nvme1: Connect command failed, error wo/DNR bit: 880

We need to set the ctrl state to NVME_CTRL_CONNECTING after :-
nvme_loop_create_ctrl()
nvme_init_ctrl()
so that the above mentioned check for nvmf_check_ready() will return
true.

This patch sets the ctrl state to connecting after we init the ctrl in
nvme_loop_create_ctrl()
nvme_init_ctrl() .

[1] commit aa63fa6776a7 ("nvme-fabrics: allow to queue requests for live queues")

Fixes: aa63fa6776a7 ("nvme-fabrics: allow to queue requests for live queues")
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Tested-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Yi Zhang <yi.zhang@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/nvme/target/loop.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -583,6 +583,9 @@ static struct nvme_ctrl *nvme_loop_creat
if (ret)
goto out_put_ctrl;

+ changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING);
+ WARN_ON_ONCE(!changed);
+
ret = -ENOMEM;

ctrl->ctrl.sqsize = opts->queue_size - 1;