Re: [PATCH v3 11/18] ata: libata: change ata_eh_request_sense() to not set CHECK_CONDITION

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On 1/24/23 20:02, Niklas Cassel wrote:
Currently, ata_eh_request_sense() unconditionally sets the scsicmd->result
to SAM_STAT_CHECK_CONDITION.

For Command Duration Limits policy 0xD:
The device shall complete the command without error (SAM_STAT_GOOD)
with the additional sense code set to DATA CURRENTLY UNAVAILABLE.

It is perfectly fine to have sense data for a command that returned
completion without error.

In order to support for CDL policy 0xD, we have to remove this
assumption that having sense data means that the command failed
(SAM_STAT_CHECK_CONDITION).

Change ata_eh_request_sense() to not set SAM_STAT_CHECK_CONDITION,
and instead move the setting of SAM_STAT_CHECK_CONDITION to the single
caller that wants SAM_STAT_CHECK_CONDITION set, that way
ata_eh_request_sense() can be reused in a follow-up patch that adds
support for CDL policy 0xD.

The only caller of ata_eh_request_sense() is protected by:
if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)), so we can remove this
duplicated check from ata_eh_request_sense() itself.

Additionally, ata_eh_request_sense() is only called from
ata_eh_analyze_tf(), which is only called when iteratating the QCs using
ata_qc_for_each_raw(), which does not include the internal tag,
so cmd can never be NULL (all non-internal commands have qc->scsicmd set),
so remove the !cmd check as well.

Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxx>
---
  drivers/ata/libata-eh.c | 25 ++++++++++++++++---------
  1 file changed, 16 insertions(+), 9 deletions(-)

Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes




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