linux-kernel - Re: [PATCH resend 5/5] libata-scsi: fix MODE SELECT translation for Control mode page

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Message-ID: <CAGnHSEnSQcxcaJopGnVusC9Q41qHKkdr4QQDmymFSxVEH6zvPQ@mail.gmail.com>
Date:	Fri, 22 Jul 2016 05:50:18 +0800
From:	Tom Yan <tom.ty89@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Hannes Reinecke <hare@...e.de>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Arnd Bergmann <arnd@...db.de>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-next@...r.kernel.org
Subject: Re: [PATCH resend 5/5] libata-scsi: fix MODE SELECT translation for
 Control mode page

As I've mentioned in the comment/message, there is no ATA command
needed to be sent to the device, since it only toggles a bit in
dev->flags. See that there is no ata_taskfile constructed in
ata_mselect_control().

On 22 July 2016 at 05:26, Tejun Heo <tj@...nel.org> wrote:
> On Fri, Jul 22, 2016 at 02:41:54AM +0800, tom.ty89@...il.com wrote:
>> @@ -3854,6 +3852,8 @@ static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
>>               if (ata_mselect_control(qc, p, pg_len, &fp) < 0) {
>>                       fp += hdr_len + bd_len;
>>                       goto invalid_param;
>> +             } else {
>> +                     goto skip; /* No ATA command to send */
>
> Hmmm... I'm a bit confused.  Why is mselect_control path different
> from mselect_caching in terms of qc handling?
>
> Thanks.
>
> --
> tejun