linux-kernel - Re: [PATCH RFC 2/2] libata: Use scsi cmnd budget token for qc tag for SAS host

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Date:   Wed, 16 Mar 2022 08:23:34 +0000
From:   John Garry <john.garry@...wei.com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <bvanassche@....org>, <ming.lei@...hat.com>, <hch@....de>,
        <hare@...e.de>
CC:     <linux-ide@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-scsi@...r.kernel.org>, <martin.wilck@...e.com>
Subject: Re: [PATCH RFC 2/2] libata: Use scsi cmnd budget token for qc tag for
 SAS host

Hi Damien,

>> -	}
>> -	return -1;
>> +	return scmd->budget_token;
>>   }
> Since this is now not actually allocating a tag, I would rename this
> something like ata_sas_get_tag(). Or even better, simply open code this
> in ata_qc_new_init() since that is the only caller.

ok, I think it might be better to open code in ata_qc_new_init(), as 
suggested. That should avoid the need for the return -1 call.

> 
>>   
>>   void ata_sas_free_tag(unsigned int tag, struct ata_port *ap)
>>   {
>> -	clear_bit(tag, &ap->sas_tag_allocated);
>>   }
> This is called only in ata_qc_free(). With this change, the function is
> empty, so let's completely remove it.
> 

ok

>>   
>>   /**
>> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
>> index ed8be585a98f..45d63a2ba3ee 100644
>> --- a/drivers/ata/libata-scsi.c
>> +++ b/drivers/ata/libata-scsi.c
>> @@ -640,7 +640,7 @@ static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
>>   {

Thanks,
John