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path: root/drivers/ata/libata-scsi.c
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Diffstat (limited to 'drivers/ata/libata-scsi.c')
-rw-r--r--drivers/ata/libata-scsi.c46
1 files changed, 35 insertions, 11 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 06c9d90238d9..42cecf95a4e5 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -638,24 +638,48 @@ EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
struct scsi_cmnd *cmd)
{
+ struct ata_port *ap = dev->link->ap;
struct ata_queued_cmd *qc;
+ int tag;
- qc = ata_qc_new_init(dev, scsi_cmd_to_rq(cmd)->tag);
- if (qc) {
- qc->scsicmd = cmd;
- qc->scsidone = scsi_done;
-
- qc->sg = scsi_sglist(cmd);
- qc->n_elem = scsi_sg_count(cmd);
+ if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
+ goto fail;
- if (scsi_cmd_to_rq(cmd)->rq_flags & RQF_QUIET)
- qc->flags |= ATA_QCFLAG_QUIET;
+ if (ap->flags & ATA_FLAG_SAS_HOST) {
+ /*
+ * SAS hosts may queue > ATA_MAX_QUEUE commands so use
+ * unique per-device budget token as a tag.
+ */
+ if (WARN_ON_ONCE(cmd->budget_token >= ATA_MAX_QUEUE))
+ goto fail;
+ tag = cmd->budget_token;
} else {
- cmd->result = (DID_OK << 16) | SAM_STAT_TASK_SET_FULL;
- scsi_done(cmd);
+ tag = scsi_cmd_to_rq(cmd)->tag;
}
+ qc = __ata_qc_from_tag(ap, tag);
+ qc->tag = qc->hw_tag = tag;
+ qc->ap = ap;
+ qc->dev = dev;
+
+ ata_qc_reinit(qc);
+
+ qc->scsicmd = cmd;
+ qc->scsidone = scsi_done;
+
+ qc->sg = scsi_sglist(cmd);
+ qc->n_elem = scsi_sg_count(cmd);
+
+ if (scsi_cmd_to_rq(cmd)->rq_flags & RQF_QUIET)
+ qc->flags |= ATA_QCFLAG_QUIET;
+
return qc;
+
+fail:
+ set_host_byte(cmd, DID_OK);
+ set_status_byte(cmd, SAM_STAT_TASK_SET_FULL);
+ scsi_done(cmd);
+ return NULL;
}
static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)