diff --git a/sys/dev/ata/ata-all.c b/sys/dev/ata/ata-all.c
index 73dfa94fd83e..5c6f0db714f1 100644
--- a/sys/dev/ata/ata-all.c
+++ b/sys/dev/ata/ata-all.c
@@ -1430,6 +1430,24 @@ ata_cam_end_transaction(device_t dev, struct ata_request *request)
 		ata_reinit(dev);
 }
 
+static int
+ata_check_ids(device_t dev, union ccb *ccb)
+{
+	struct ata_channel *ch = device_get_softc(dev);
+
+	if (ccb->ccb_h.target_id > ((ch->flags & ATA_NO_SLAVE) ? 0 : 1)) {
+		ccb->ccb_h.status = CAM_TID_INVALID;
+		xpt_done(ccb);
+		return (-1);
+	}
+	if (ccb->ccb_h.target_lun != 0) {
+		ccb->ccb_h.status = CAM_LUN_INVALID;
+		xpt_done(ccb);
+		return (-1);
+	}
+	return (0);
+}
+
 static void
 ataaction(struct cam_sim *sim, union ccb *ccb)
 {
@@ -1445,10 +1463,11 @@ ataaction(struct cam_sim *sim, union ccb *ccb)
 	/* Common cases first */
 	case XPT_ATA_IO:	/* Execute the requested I/O operation */
 	case XPT_SCSI_IO:
+		if (ata_check_ids(dev, ccb))
+			return;
 		if ((ch->devices & ((ATA_ATA_MASTER | ATA_ATAPI_MASTER)
 		    << ccb->ccb_h.target_id)) == 0) {
 			ccb->ccb_h.status = CAM_SEL_TIMEOUT;
-			xpt_done(ccb);
 			break;
 		}
 		if (ch->running)
@@ -1467,11 +1486,10 @@ ataaction(struct cam_sim *sim, union ccb *ccb)
 				res->lba_mid = 0x14;
 			}
 			ccb->ccb_h.status = CAM_REQ_CMP;
-			xpt_done(ccb);
 			break;
 		}
 		ata_cam_begin_transaction(dev, ccb);
-		break;
+		return;
 	case XPT_EN_LUN:		/* Enable LUN as a target */
 	case XPT_TARGET_IO:		/* Execute target I/O request */
 	case XPT_ACCEPT_TARGET_IO:	/* Accept Host Target Mode CDB */
@@ -1479,13 +1497,14 @@ ataaction(struct cam_sim *sim, union ccb *ccb)
 	case XPT_ABORT:			/* Abort the specified CCB */
 		/* XXX Implement */
 		ccb->ccb_h.status = CAM_REQ_INVALID;
-		xpt_done(ccb);
 		break;
 	case XPT_SET_TRAN_SETTINGS:
 	{
 		struct	ccb_trans_settings *cts = &ccb->cts;
 		struct	ata_cam_device *d; 
 
+		if (ata_check_ids(dev, ccb))
+			return;
 		if (cts->type == CTS_TYPE_CURRENT_SETTINGS)
 			d = &ch->curr[ccb->ccb_h.target_id];
 		else
@@ -1520,7 +1539,6 @@ ataaction(struct cam_sim *sim, union ccb *ccb)
 				d->atapi = cts->xport_specific.ata.atapi;
 		}
 		ccb->ccb_h.status = CAM_REQ_CMP;
-		xpt_done(ccb);
 		break;
 	}
 	case XPT_GET_TRAN_SETTINGS:
@@ -1528,6 +1546,8 @@ ataaction(struct cam_sim *sim, union ccb *ccb)
 		struct	ccb_trans_settings *cts = &ccb->cts;
 		struct  ata_cam_device *d;
 
+		if (ata_check_ids(dev, ccb))
+			return;
 		if (cts->type == CTS_TYPE_CURRENT_SETTINGS)
 			d = &ch->curr[ccb->ccb_h.target_id];
 		else
@@ -1567,48 +1587,16 @@ ataaction(struct cam_sim *sim, union ccb *ccb)
 			cts->xport_specific.ata.valid |= CTS_ATA_VALID_ATAPI;
 		}
 		ccb->ccb_h.status = CAM_REQ_CMP;
-		xpt_done(ccb);
 		break;
 	}
-#if 0
-	case XPT_CALC_GEOMETRY:
-	{
-		struct	  ccb_calc_geometry *ccg;
-		uint32_t size_mb;
-		uint32_t secs_per_cylinder;
-
-		ccg = &ccb->ccg;
-		size_mb = ccg->volume_size
-			/ ((1024L * 1024L) / ccg->block_size);
-		if (size_mb >= 1024 && (aha->extended_trans != 0)) {
-			if (size_mb >= 2048) {
-				ccg->heads = 255;
-				ccg->secs_per_track = 63;
-			} else {
-				ccg->heads = 128;
-				ccg->secs_per_track = 32;
-			}
-		} else {
-			ccg->heads = 64;
-			ccg->secs_per_track = 32;
-		}
-		secs_per_cylinder = ccg->heads * ccg->secs_per_track;
-		ccg->cylinders = ccg->volume_size / secs_per_cylinder;
-		ccb->ccb_h.status = CAM_REQ_CMP;
-		xpt_done(ccb);
-		break;
-	}
-#endif
 	case XPT_RESET_BUS:		/* Reset the specified SCSI bus */
 	case XPT_RESET_DEV:	/* Bus Device Reset the specified SCSI device */
 		ata_reinit(dev);
 		ccb->ccb_h.status = CAM_REQ_CMP;
-		xpt_done(ccb);
 		break;
 	case XPT_TERM_IO:		/* Terminate the I/O process */
 		/* XXX Implement */
 		ccb->ccb_h.status = CAM_REQ_INVALID;
-		xpt_done(ccb);
 		break;
 	case XPT_PATH_INQ:		/* Path routing inquiry */
 	{
@@ -1643,14 +1631,13 @@ ataaction(struct cam_sim *sim, union ccb *ccb)
 		cpi->protocol_version = PROTO_VERSION_UNSPECIFIED;
 		cpi->maxio = ch->dma.max_iosize ? ch->dma.max_iosize : DFLTPHYS;
 		cpi->ccb_h.status = CAM_REQ_CMP;
-		xpt_done(ccb);
 		break;
 	}
 	default:
 		ccb->ccb_h.status = CAM_REQ_INVALID;
-		xpt_done(ccb);
 		break;
 	}
+	xpt_done(ccb);
 }
 
 static void