[PATCH] nvme: avoid "(efault)" from nvme_sysfs_show_subsysnqn()

[Chaitanya Kulkarni]

On 2/1/21 14:41, mwilck at suse.com wrote:
> -	return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subsys->subnqn);
> +	if (ctrl->subsys)
> +		subsysnqn = ctrl->subsys->subnqn;
> +	else if (ctrl->opts && ctrl->opts->subsysnqn)
> +		subsysnqn = ctrl->opts->subsysnqn;
> +	else
> +		subsysnqn = "unknown";
Just initialize the subsysnqnq to unknown string at the time of declaration.

Also, can you please add a testcase for this bug in blktests to make
sure this
behavior will not repeat  ?