Re: [PATCH 1/2] scsi: ufs: Add Multi-Circular Queue support

["Asutosh Das (asd)" <quic_asutoshd@quicinc.com>]

On 7/28/2022 12:38 PM, Bart Van Assche wrote:
> On 7/19/22 00:01, Can Guo wrote:
>>   static int ufshcd_map_queues(struct Scsi_Host *shost)
>>   {
>> -    int i, ret;
>> +    int i, queue_offset = 0, ret;
>> +    struct ufs_hba *hba = shost_priv(shost);
>>       for (i = 0; i < shost->nr_maps; i++) {
>>           struct blk_mq_queue_map *map = &shost->tag_set.map[i];
>> -        switch (i) {
>> -        case HCTX_TYPE_DEFAULT:
>> -        case HCTX_TYPE_POLL:
>> -            map->nr_queues = 1;
>> -            break;
>> -        case HCTX_TYPE_READ:
>> -            map->nr_queues = 0;
>> +        map->nr_queues = hba->nr_queues[i];
>> +        if (!map->nr_queues)
>>               continue;
>> -        default:
>> -            WARN_ON_ONCE(true);
>> -        }
>> -        map->queue_offset = 0;
>> +
>> +        map->queue_offset = queue_offset;
>> +        if (i == HCTX_TYPE_POLL && !is_mcq_enabled(hba))
>> +            map->queue_offset = 0;
>> +
>>           ret = blk_mq_map_queues(map);
>> -        WARN_ON_ONCE(ret);
>> +
>> +        if (ret)
>> +            return ret;
>> +
>> +        queue_offset += map->nr_queues;
>>       }
> 
> It is not clear to me why the WARN_ON_ONCE(ret) statement has been 
> changed into "if (ret) return ret;"?
> 
Looks like blk_mq_map_queues() only returns 0.
Will remove the if (ret) return ret statement in the next version.

> Thanks,
> 
> Bart.