When a disk needs to be waken up from sleep, ensure that the command is retried by SCSI EH.

Signed-off-by: Gwendal Grignou <gwendal@google.com>
---
 drivers/ata/libata-core.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

The explanation did not go through git-send-email:

 Without this fix, ATA passthrough commands are not resend to the
drive, and no error is
 signalled to the caller because:
 - allowed retry count is 1
 - ata_eh_qc_complete fill the sense data, so result is valid
 - sense data is filled with untouched ATA registers.

Gwendal.

On Thu, Aug 6, 2009 at 10:25 AM, Gwendal Grignou<gwendal@google.com> wrote:
>
> Signed-off-by: Gwendal Grignou <gwendal@google.com>
> ---
>  drivers/ata/libata-core.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
> index 8ac98ff..5b7616d 100644
> --- a/drivers/ata/libata-core.c
> +++ b/drivers/ata/libata-core.c
> @@ -5145,6 +5145,8 @@ void ata_qc_issue(struct ata_queued_cmd *qc)
>        /* if device is sleeping, schedule reset and abort the link */
>        if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
>                link->eh_info.action |= ATA_EH_RESET;
> +               if (qc->scsicmd)
> +                       qc->scsicmd->allowed++;
>                ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
>                ata_link_abort(link);
>                return;
> --
> 1.5.4.3
>
>
--
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Gwendal Grignou wrote:
> The explanation did not go through git-send-email:
> 
>  Without this fix, ATA passthrough commands are not resend to the
> drive, and no error is
>  signalled to the caller because:
>  - allowed retry count is 1
>  - ata_eh_qc_complete fill the sense data, so result is valid
>  - sense data is filled with untouched ATA registers.

Would setting ATA_QCFLAG_RETRY achieve the same result?

Thanks.

ATA_QCFLAG_RETRY is already set [by _autopsy()], ata_eh_qc_retry() was
already called, but given retries is 0, we can not reduce it.
However, I will submit a better patch, in ata_eh_qc_retry().

Gwendal.

On Fri, Aug 7, 2009 at 1:34 AM, Tejun Heo<tj@kernel.org> wrote:
> Gwendal Grignou wrote:
>> The explanation did not go through git-send-email:
>>
>>  Without this fix, ATA passthrough commands are not resend to the
>> drive, and no error is
>>  signalled to the caller because:
>>  - allowed retry count is 1
>>  - ata_eh_qc_complete fill the sense data, so result is valid
My mistake: __ata_eh_qc_complete() instead of ata_eh_qc_complete().
>>  - sense data is filled with untouched ATA registers.
>
> Would setting ATA_QCFLAG_RETRY achieve the same result?
>
> Thanks.
>
> --
> tejun
>
--
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html