[PATCHv3 3/5] nvme: implement I/O Command Sets Command Set support

[Christoph Hellwig]

On Tue, Jun 23, 2020 at 01:53:47AM -0700, Sagi Grimberg wrote:
>>   	if (ns->lba_shift == 0)
>>   		ns->lba_shift = 9;
>>   +	switch (ns->head->ids.csi) {
>> +	case NVME_CSI_NVM:
>> +		break;
>> +	default:
>> +		dev_warn(ctrl->device, "unknown csi:%d ns:%d\n",
>> +			ns->head->ids.csi, ns->head->ns_id);
>> +		return -ENODEV;
>> +	}
>
> Not sure we need a switch-case statement for a single case target...

I think a switch makes inherent sense when there is an identifier that
can have multiple values, even if there only is one for now.