From: Ming Lei ming.lei@redhat.com
commit 99dc264014d5aed66ee37ddf136a38b5a2b1b529 upstream.
Move start_freeze into nvme_tcp_configure_io_queues(), and there is at least two benefits:
1) fix unbalanced freeze and unfreeze, since re-connection work may fail or be broken by removal
2) IO during error recovery can be failfast quickly because nvme fabrics unquiesces queues after teardown.
One side-effect is that !mpath request may timeout during connecting because of queue topo change, but that looks not one big deal:
1) same problem exists with current code base
2) compared with !mpath, mpath use case is dominant
Fixes: 2875b0aecabe ("nvme-tcp: fix controller reset hang during traffic") Cc: stable@vger.kernel.org Signed-off-by: Ming Lei ming.lei@redhat.com Tested-by: Yi Zhang yi.zhang@redhat.com Reviewed-by: Sagi Grimberg sagi@grimberg.me Signed-off-by: Keith Busch kbusch@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/nvme/host/tcp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -1707,6 +1707,7 @@ static int nvme_tcp_configure_io_queues( goto out_cleanup_connect_q;
if (!new) { + nvme_start_freeze(ctrl); nvme_start_queues(ctrl); if (!nvme_wait_freeze_timeout(ctrl, NVME_IO_TIMEOUT)) { /* @@ -1715,6 +1716,7 @@ static int nvme_tcp_configure_io_queues( * to be safe. */ ret = -ENODEV; + nvme_unfreeze(ctrl); goto out_wait_freeze_timed_out; } blk_mq_update_nr_hw_queues(ctrl->tagset, @@ -1837,7 +1839,6 @@ static void nvme_tcp_teardown_io_queues( if (ctrl->queue_count <= 1) return; blk_mq_quiesce_queue(ctrl->admin_q); - nvme_start_freeze(ctrl); nvme_stop_queues(ctrl); nvme_sync_io_queues(ctrl); nvme_tcp_stop_io_queues(ctrl);