[PATCH 1/1] nvme/fc: add 'discovery' sysfs attribute to fc transport device

[Christoph Hellwig]

> +	list_for_each_entry(lport, &nvme_fc_lport_list, port_list) {
> +		list_for_each_entry_safe(rport, tmp_rport,
> +					 &lport->endp_list, endp_list) {
> +			if (!nvme_fc_rport_get(rport))
> +				continue;
> +			spin_unlock_irqrestore(&nvme_fc_lock, flags);
> +			nvme_fc_signal_discovery_scan(lport, rport);
> +			nvme_fc_rport_put(rport);
> +			spin_lock_irqsave(&nvme_fc_lock, flags);
> +		}
> +	}
> +	spin_unlock_irqrestore(&nvme_fc_lock, flags);

What guarantees the list next pointers are still valid after
you dropped nvme_fc_lock?