Re: [PATCH v3 10/18] ata: libata-scsi: remove unnecessary !cmd checks

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On 1/24/23 20:02, Niklas Cassel wrote:
There is no need to check if !cmd as this can only happen for
ATA internal commands which uses the ATA internal tag (32).

Most users of ata_scsi_set_sense() are from _xlat functions that
translate a scsicmd to an ATA command. These obviously have a qc->scsicmd.

ata_scsi_qc_complete() can also call ata_scsi_set_sense() via
ata_gen_passthru_sense() / ata_gen_ata_sense(), called via
ata_scsi_qc_complete(). This callback is only called for translated
commands, so it also has a qc->scsicmd.

ata_eh_analyze_ncq_error(): the NCQ error log can only contain a 0-31
value, so it will never be able to get the ATA internal tag (32).

ata_eh_request_sense(): only called by 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.

Since there is no existing call site where cmd can be NULL, remove the
!cmd check from ata_scsi_set_sense() and ata_scsi_set_sense_information().

Suggested-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxx>
---
  drivers/ata/libata-scsi.c | 6 ------
  1 file changed, 6 deletions(-)

Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes




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