nvme: fc: split controller bringup handling

Drivers must call nvme_uninit_ctrl after a successful nvme_init_ctrl.
Split the allocation side out to make the error handling boundary easier
to navigate. The nvme fc driver's error handling had different returns
in the error goto label's, which harm readability.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>

Author: keithbusch

drivers/nvme/host/fc.c

@@ -3444,12 +3444,11 @@ nvme_fc_existing_controller(struct nvme_fc_rport *rport,
 	return found;
 }
 
-static struct nvme_ctrl *
-nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
+static struct nvme_fc_ctrl *
+nvme_fc_alloc_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
 	struct nvme_fc_lport *lport, struct nvme_fc_rport *rport)
 {
 	struct nvme_fc_ctrl *ctrl;
-	unsigned long flags;
 	int ret, idx, ctrl_loss_tmo;
 
 	if (!(rport->remoteport.port_role &
@@ -3538,7 +3537,31 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
 	if (lport->dev)
 		ctrl->ctrl.numa_node = dev_to_node(lport->dev);
 
-	/* at this point, teardown path changes to ref counting on nvme ctrl */
+	return ctrl;
+
+out_free_queues:
+	kfree(ctrl->queues);
+out_free_ida:
+	put_device(ctrl->dev);
+	ida_free(&nvme_fc_ctrl_cnt, ctrl->cnum);
+out_free_ctrl:
+	kfree(ctrl);
+out_fail:
+	/* exit via here doesn't follow ctlr ref points */
+	return ERR_PTR(ret);
+}
+
+static struct nvme_ctrl *
+nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
+	struct nvme_fc_lport *lport, struct nvme_fc_rport *rport)
+{
+	struct nvme_fc_ctrl *ctrl;
+	unsigned long flags;
+	int ret;
+
+	ctrl = nvme_fc_alloc_ctrl(dev, opts, lport, rport);
+	if (IS_ERR(ctrl))
+		return ERR_CAST(ctrl);
 
 	ret = nvme_alloc_admin_tag_set(&ctrl->ctrl, &ctrl->admin_tag_set,
 			&nvme_fc_admin_mq_ops,
@@ -3597,20 +3620,8 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
 	nvme_fc_rport_get(rport);
 
 	return ERR_PTR(-EIO);
-
-out_free_queues:
-	kfree(ctrl->queues);
-out_free_ida:
-	put_device(ctrl->dev);
-	ida_free(&nvme_fc_ctrl_cnt, ctrl->cnum);
-out_free_ctrl:
-	kfree(ctrl);
-out_fail:
-	/* exit via here doesn't follow ctlr ref points */
-	return ERR_PTR(ret);
 }
 
-
 struct nvmet_fc_traddr {
 	u64	nn;
 	u64	pn;