[PATCH 8/8] nvmet: make configfs setup namespace aware

[Maurizio Lombardi]

On Sat Jun 13, 2026 at 1:14 PM CEST, Hannes Reinecke wrote:
> Implement 'fill_subsystem' and 'clear_subsystem' callbacks to make
> nvmet configfs namespace aware.
>
> +static int nvmet_add_port_list(u64 ns_id, struct nvmet_port *p)
> +{
> +	struct list_head *port_list;
> +
> +	mutex_lock(&nvmet_ports_mutex);
> +	port_list = idr_find(&nvmet_ports_idr, ns_id);
> +	if (!port_list) {
> +		int err;
> +
> +		port_list = kzalloc_obj(*port_list);
> +		if (!port_list)
> +			return -ENOMEM;
> +		INIT_LIST_HEAD(port_list);
> +		err = idr_alloc(&nvmet_ports_idr, port_list,
> +				ns_id, ns_id + 1, GFP_KERNEL);
> +		if (err < 0) {
> +			kfree(port_list);
> +			return err;
> +		}
> +		WARN_ON(err != ns_id);
> +	}
> +	list_add(&p->global_entry, port_list);
> +	mutex_unlock(&nvmet_ports_mutex);
> +	return 0;
> +}

Just a minor thing that I noticed: the error paths leave the mutex
locked.

Maurizio