[SCSI] libsas: fixup NCQ for SATA disks

We actually had two problems: the one with the tag (which is fixed by
zeroing the tag before sending the taskfile to the sequencer) but the
other with the fact that we sent our first NCQ command to the device
before the sequencer had been informed of the NCQ tagging
capabilities.  I fixed the latter by moving the rphy_add() to the
correct point in the code after the NCQ capabilities are set up.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/aic94xx/aic94xx_task.c

@@ -391,7 +391,6 @@ static int asd_build_ata_ascb(struct asd_ascb *ascb, struct sas_task *task,
 
 	scb->ata_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
 	scb->ata_task.fis = task->ata_task.fis;
-	scb->ata_task.fis.fis_type = 0x27;
 	if (likely(!task->ata_task.device_control_reg_update))
 		scb->ata_task.fis.flags |= 0x80; /* C=1: update ATA cmd reg */
 	scb->ata_task.fis.flags &= 0xF0; /* PM_PORT field shall be 0 */

drivers/scsi/libsas/sas_discover.c

@@ -371,6 +371,7 @@ static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
 
 	task->dev = dev;
 
+	task->ata_task.fis.fis_type = 0x27;
 	task->ata_task.fis.command = command;
 	task->ata_task.fis.features = features;
 	task->ata_task.fis.device = d2h_fis->device;
@@ -483,11 +484,7 @@ cont1:
 
 	sas_fill_in_rphy(dev, dev->rphy);
 
-	res = sas_rphy_add(dev->rphy);
-	if (res)
-		goto out_err;
-
-	return res;
+	return 0;
 out_err:
 	dev->sata_dev.identify_packet_device = NULL;
 	dev->sata_dev.identify_device = NULL;
@@ -555,7 +552,7 @@ int sas_discover_sata(struct domain_device *dev)
 
 	res = sas_notify_lldd_dev_found(dev);
 	if (res)
-		goto out_err2;
+		return res;
 
 	switch (dev->dev_type) {
 	case SATA_DEV:
@@ -567,23 +564,12 @@ int sas_discover_sata(struct domain_device *dev)
 	default:
 		break;
 	}
-	if (res)
-		goto out_err;
-
 	sas_notify_lldd_dev_gone(dev);
-	res = sas_notify_lldd_dev_found(dev);
-	if (res)
-		goto out_err2;
-
+	if (!res) {
+		sas_notify_lldd_dev_found(dev);
 		res = sas_rphy_add(dev->rphy);
-	if (res)
-		goto out_err;
-
-	return res;
+	}
 
-out_err:
-	sas_notify_lldd_dev_gone(dev);
-out_err2:
 	return res;
 }
 

drivers/scsi/libsas/sas_scsi_host.c

@@ -812,6 +812,12 @@ static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 	task->task_proto = SAS_PROTOCOL_STP;
 	task->task_done = sas_ata_task_done;
 
+	if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
+	    qc->tf.command == ATA_CMD_FPDMA_READ) {
+		/* Need to zero out the tag libata assigned us */
+		qc->tf.nsect = 0;
+	}
+
 	ata_tf_to_fis(&qc->tf, (u8*)&task->ata_task.fis, 0);
 	task->uldd_task = qc;
 	if (is_atapi_taskfile(&qc->tf)) {