On Fri, Jul 29, 2016@10:57:19PM +0300, Sagi Grimberg wrote:

If we wait until we free the controller (free_ctrl) we might
lose our rdma device without any notification while we still
have open resources (tags mrs and dma mappings).

Instead, destroy the tags with their rdma resources once we
delete the device and not when freeing it.

Note that we don't do that in nvme_rdma_shutdown_ctrl because
controller reset uses it as well and we want to give active I/O
a chance to complete successfully.

Reported-by: Steve Wise <swise at opengridcomputing.com>
Signed-off-by: Sagi Grimberg <sagi at grimberg.me>

This looks fine to me, but can we place share the code instead of
duplicating it?  E.g.

static void __nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
{
 	nvme_remove_namespaces(&ctrl->ctrl);
	if (shutdown)
	  	nvme_rdma_shutdown_ctrl(ctrl);
  	nvme_uninit_ctrl(&ctrl->ctrl);
	if (ctrl->ctrl.tagset) {
		blk_cleanup_queue(ctrl->ctrl.connect_q);
		blk_mq_free_tag_set(&ctrl->tag_set);
		nvme_rdma_dev_put(ctrl->device);
	}
	nvme_put_ctrl(&ctrl->ctrl);
}

or in a second step we should probably always call shutdown_ctrl
but skip the actual shutdown if the ctrl state doesn't require it.