diff --git a/sys/cam/ata/ata_da.c b/sys/cam/ata/ata_da.c
--- a/sys/cam/ata/ata_da.c
+++ b/sys/cam/ata/ata_da.c
@@ -1834,13 +1834,6 @@
 	announce_buf = softc->announce_temp;
 	bzero(announce_buf, ADA_ANNOUNCETMP_SZ);
 
-	if (cam_iosched_init(&softc->cam_iosched, periph) != 0) {
-		printf("adaregister: Unable to probe new device. "
-		       "Unable to allocate iosched memory\n");
-		free(softc, M_DEVBUF);
-		return(CAM_REQ_CMP_ERR);
-	}
-
 	periph->softc = softc;
 	xpt_path_inq(&softc->cpi, periph->path);
 
@@ -1901,8 +1894,6 @@
 	} else {
 		softc->flags |= ADA_FLAG_ROTATING;
 	}
-	cam_iosched_set_sort_queue(softc->cam_iosched,
-	    (softc->flags & ADA_FLAG_ROTATING) ? -1 : 0);
 	softc->disk = disk_alloc();
 	adasetgeom(softc, cgd);
 	softc->disk->d_devstat = devstat_new_entry(periph->periph_name,
@@ -1921,6 +1912,16 @@
 	softc->disk->d_name = "ada";
 	softc->disk->d_drv1 = periph;
 	softc->disk->d_unit = periph->unit_number;
+
+	if (cam_iosched_init(&softc->cam_iosched, periph, softc->disk) != 0) {
+		printf("adaregister: Unable to probe new device. "
+		       "Unable to allocate iosched memory\n");
+		free(softc, M_DEVBUF);
+		return(CAM_REQ_CMP_ERR);
+	}
+	cam_iosched_set_sort_queue(softc->cam_iosched,
+	    (softc->flags & ADA_FLAG_ROTATING) ? -1 : 0);
+
 	cam_periph_lock(periph);
 
 	dp = &softc->params;
diff --git a/sys/cam/cam_iosched.h b/sys/cam/cam_iosched.h
--- a/sys/cam/cam_iosched.h
+++ b/sys/cam/cam_iosched.h
@@ -80,7 +80,8 @@
 
 typedef void (*cam_iosched_latfcn_t)(void *, sbintime_t, struct bio *);
 
-int cam_iosched_init(struct cam_iosched_softc **, struct cam_periph *periph);
+int cam_iosched_init(struct cam_iosched_softc **, struct cam_periph *periph,
+    const struct disk *dp);
 void cam_iosched_fini(struct cam_iosched_softc *);
 void cam_iosched_sysctl_init(struct cam_iosched_softc *, struct sysctl_ctx_list *, struct sysctl_oid *);
 struct bio *cam_iosched_next_trim(struct cam_iosched_softc *isc);
diff --git a/sys/cam/cam_iosched.c b/sys/cam/cam_iosched.c
--- a/sys/cam/cam_iosched.c
+++ b/sys/cam/cam_iosched.c
@@ -314,6 +314,7 @@
 struct cam_iosched_softc {
 	struct bio_queue_head bio_queue;
 	struct bio_queue_head trim_queue;
+	const struct disk *disk;
 				/* scheduler flags < 16, user flags >= 16 */
 	uint32_t	flags;
 	int		sort_io_queue;
@@ -1153,12 +1154,14 @@
  * sizeof struct cam_iosched_softc.
  */
 int
-cam_iosched_init(struct cam_iosched_softc **iscp, struct cam_periph *periph)
+cam_iosched_init(struct cam_iosched_softc **iscp, struct cam_periph *periph,
+    const struct disk *dp)
 {
 
 	*iscp = malloc(sizeof(**iscp), M_CAMSCHED, M_NOWAIT | M_ZERO);
 	if (*iscp == NULL)
 		return ENOMEM;
+	(*iscp)->disk = dp;
 #ifdef CAM_IOSCHED_DYNAMIC
 	if (iosched_debug)
 		printf("CAM IOSCHEDULER Allocating entry at %p\n", *iscp);
diff --git a/sys/cam/nvme/nvme_da.c b/sys/cam/nvme/nvme_da.c
--- a/sys/cam/nvme/nvme_da.c
+++ b/sys/cam/nvme/nvme_da.c
@@ -862,13 +862,6 @@
 		return(CAM_REQ_CMP_ERR);
 	}
 
-	if (cam_iosched_init(&softc->cam_iosched, periph) != 0) {
-		printf("ndaregister: Unable to probe new device. "
-		       "Unable to allocate iosched memory\n");
-		free(softc, M_DEVBUF);
-		return(CAM_REQ_CMP_ERR);
-	}
-
 	/* ident_data parsing */
 
 	periph->softc = softc;
@@ -891,7 +884,6 @@
 	quirks = softc->quirks;
 	TUNABLE_INT_FETCH(announce_buf, &quirks);
 	softc->quirks = quirks;
-	cam_iosched_set_sort_queue(softc->cam_iosched, 0);
 	softc->disk = disk = disk_alloc();
 	disk->d_rotation_rate = DISK_RR_NON_ROTATING;
 	disk->d_open = ndaopen;
@@ -953,6 +945,15 @@
 	    DEVSTAT_ALL_SUPPORTED,
 	    DEVSTAT_TYPE_DIRECT | XPORT_DEVSTAT_TYPE(cpi.transport),
 	    DEVSTAT_PRIORITY_DISK);
+
+	if (cam_iosched_init(&softc->cam_iosched, periph, disk) != 0) {
+		printf("ndaregister: Unable to probe new device. "
+		       "Unable to allocate iosched memory\n");
+		free(softc, M_DEVBUF);
+		return(CAM_REQ_CMP_ERR);
+	}
+	cam_iosched_set_sort_queue(softc->cam_iosched, 0);
+
 	/*
 	 * Add alias for older nvd drives to ease transition.
 	 */
diff --git a/sys/cam/scsi/scsi_da.c b/sys/cam/scsi/scsi_da.c
--- a/sys/cam/scsi/scsi_da.c
+++ b/sys/cam/scsi/scsi_da.c
@@ -2804,13 +2804,6 @@
 		return(CAM_REQ_CMP_ERR);
 	}
 
-	if (cam_iosched_init(&softc->cam_iosched, periph) != 0) {
-		printf("daregister: Unable to probe new device. "
-		       "Unable to allocate iosched memory\n");
-		free(softc, M_DEVBUF);
-		return(CAM_REQ_CMP_ERR);
-	}
-
 	LIST_INIT(&softc->pending_ccbs);
 	softc->state = DA_STATE_PROBE_WP;
 	bioq_init(&softc->delete_run_queue);
@@ -2979,7 +2972,13 @@
 	softc->disk->d_hba_subdevice = cpi.hba_subdevice;
 	snprintf(softc->disk->d_attachment, sizeof(softc->disk->d_attachment),
 	    "%s%d", cpi.dev_name, cpi.unit_number);
-	cam_periph_lock(periph);
+
+	if (cam_iosched_init(&softc->cam_iosched, periph, softc->disk) != 0) {
+		printf("daregister: Unable to probe new device. "
+		       "Unable to allocate iosched memory\n");
+		free(softc, M_DEVBUF);
+		return(CAM_REQ_CMP_ERR);
+	}
 
 	/*
 	 * Add async callbacks for events of interest.
@@ -2988,6 +2987,7 @@
 	 * fine without them and the only alternative
 	 * would be to not attach the device on failure.
 	 */
+	cam_periph_lock(periph);
 	xpt_register_async(AC_SENT_BDR | AC_BUS_RESET | AC_LOST_DEVICE |
 	    AC_ADVINFO_CHANGED | AC_SCSI_AEN | AC_UNIT_ATTENTION |
 	    AC_INQ_CHANGED, daasync, periph, periph->path);