linux-kernel - Re: [PATCH v2] ata: libata-scsi: Fix get identity data failed

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Date:   Fri, 5 May 2023 17:14:04 +0800
From:   yangxingui <yangxingui@...wei.com>
To:     John Garry <john.g.garry@...cle.com>,
        Damien Le Moal <dlemoal@...nel.org>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <damien.lemoal@...nsource.wdc.com>
CC:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, <prime.zeng@...ilicon.com>,
        <kangfenglong@...wei.com>
Subject: Re: [PATCH v2] ata: libata-scsi: Fix get identity data failed



On 2023/5/5 16:25, John Garry wrote:
> On 05/05/2023 09:17, Damien Le Moal wrote:
>>> --- a/drivers/ata/libata-scsi.c
>>> +++ b/drivers/ata/libata-scsi.c
>>> @@ -26,6 +26,7 @@
>>>   #include <scsi/scsi_device.h>
>>>   #include <scsi/scsi_tcq.h>
>>>   #include <scsi/scsi_transport.h>
>>> +#include <scsi/libsas.h>
> 
> hmmm... is it really acceptable that libata is referencing libsas? I 
> didn't think that it would be. libsas uses libata, not the other way 
> around.
Yeah, I didn't expect that either. Is there any other way? If so, is 
patch v1 OK?
> 
>>>   #include <linux/libata.h>
>>>   #include <linux/hdreg.h>
>>>   #include <linux/uaccess.h>
>>> @@ -2745,10 +2746,17 @@ static struct ata_device 
>>> *__ata_scsi_find_dev(struct ata_port *ap,
>>>    *    Associated ATA device, or %NULL if not found.
>>>    */
>>>   struct ata_device *
>>> -ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device 
>>> *scsidev)
>> Why drop the const ?
>>
>>> +ata_scsi_find_dev(struct ata_port *ap, struct scsi_device *scsidev)
>>>   {
>>> -    struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
>>> +    struct ata_device *dev;
>>> +
>>> +    if (ap->flags & ATA_FLAG_SAS_HOST) {
> 
> And this is SAS host. Not necessarily libsas (even though with ipr 
> libata usage gone, it would be the only user).
Add a new flag only for libsas?

Thanks,
Xingui
.
> 
>>> +        struct domain_device *ddev = sdev_to_domain_dev(scsidev);
>>> +
>>> +        return sas_to_ata_dev(ddev);
>> Do you really need the ddev variable ? Also, this really should be a 
>> libsas
>> helper. I beleive this pattern is repeated in several places in 
>> libsas, so that
>> would nicely clean things up.
>>
> Thanks,
> John
> .