Index: sys/cam/ata/ata_da.c
===================================================================
--- sys/cam/ata/ata_da.c
+++ sys/cam/ata/ata_da.c
@@ -1806,6 +1806,12 @@
 		    "Unable to allocate softc\n");
 		return(CAM_REQ_CMP_ERR);
 	}
+	if ((softc->disk = disk_alloc_nowait()) == NULL) {
+		printf("adaregister: Unable to probe new device. "
+		    "Unable to allocate disk\n");
+		free(softc, M_DEVBUF);
+		return(CAM_REQ_CMP_ERR);
+	}
 
 	announce_buf = softc->announce_temp;
 	bzero(announce_buf, ADA_ANNOUNCETMP_SZ);
@@ -1813,6 +1819,7 @@
 	if (cam_iosched_init(&softc->cam_iosched, periph) != 0) {
 		printf("adaregister: Unable to probe new device. "
 		       "Unable to allocate iosched memory\n");
+		disk_free(softc->disk);
 		free(softc, M_DEVBUF);
 		return(CAM_REQ_CMP_ERR);
 	}
@@ -1868,7 +1875,6 @@
 	}
 	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,
 			  periph->unit_number, softc->params.secsize,
Index: sys/cam/mmc/mmc_da.c
===================================================================
--- sys/cam/mmc/mmc_da.c
+++ sys/cam/mmc/mmc_da.c
@@ -1542,6 +1542,12 @@
 		printf("Cannot add partition for sdda\n");
 		return (false);
 	}
+	if ((part->disk = disk_alloc_nowait()) == NULL) {
+		printf("Cannot alloc disk for sdda\n");
+		free(part, M_DEVBUF);
+		sc->part[type] = NULL;
+		return (false);
+	}
 
 	part->cnt = cnt;
 	part->type = type;
@@ -1575,7 +1581,6 @@
 	(void)cam_periph_hold(periph, PRIBIO);
 	cam_periph_unlock(periph);
 
-	part->disk = disk_alloc();
 	part->disk->d_rotation_rate = DISK_RR_NON_ROTATING;
 	part->disk->d_devstat = devstat_new_entry(part->name,
 	    cnt, 512,
Index: sys/cam/nvme/nvme_da.c
===================================================================
--- sys/cam/nvme/nvme_da.c
+++ sys/cam/nvme/nvme_da.c
@@ -854,16 +854,23 @@
 
 	softc = (struct nda_softc *)malloc(sizeof(*softc), M_DEVBUF,
 	    M_NOWAIT | M_ZERO);
-
 	if (softc == NULL) {
 		printf("ndaregister: Unable to probe new device. "
 		    "Unable to allocate softc\n");
 		return(CAM_REQ_CMP_ERR);
 	}
 
+	if ((disk = disk_alloc_nowait()) == NULL) {
+		printf("ndaregister: Unable to probe new device. "
+		    "Unable to allocate disk\n");
+		free(softc, M_DEVBUF);
+		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");
+		disk_free(disk);
 		free(softc, M_DEVBUF);
 		return(CAM_REQ_CMP_ERR);
 	}
@@ -891,7 +898,7 @@
 	TUNABLE_INT_FETCH(announce_buf, &quirks);
 	softc->quirks = quirks;
 	cam_iosched_set_sort_queue(softc->cam_iosched, 0);
-	softc->disk = disk = disk_alloc();
+	softc->disk = disk;
 	disk->d_rotation_rate = DISK_RR_NON_ROTATING;
 	disk->d_open = ndaopen;
 	disk->d_close = ndaclose;
Index: sys/cam/scsi/scsi_cd.c
===================================================================
--- sys/cam/scsi/scsi_cd.c
+++ sys/cam/scsi/scsi_cd.c
@@ -605,6 +605,12 @@
 		       "Unable to allocate softc\n");
 		return(CAM_REQ_CMP_ERR);
 	}
+	if ((softc->disk = disk_alloc()) == NULL) {
+		printf("cdregister: Unable to probe new device. "
+		       "Unable to allocate softc\n");
+		free(softc, M_DEVBUF);
+		return(CAM_REQ_CMP_ERR);
+	}
 
 	LIST_INIT(&softc->pending_ccbs);
 	STAILQ_INIT(&softc->mode_queue);
@@ -673,7 +679,6 @@
 	 * WORM peripheral driver.  WORM drives will also have the WORM
 	 * driver attached to them.
 	 */
-	softc->disk = disk_alloc();
 	softc->disk->d_devstat = devstat_new_entry("cd",
 			  periph->unit_number, 0,
 			  DEVSTAT_BS_UNAVAILABLE,
Index: sys/cam/scsi/scsi_da.c
===================================================================
--- sys/cam/scsi/scsi_da.c
+++ sys/cam/scsi/scsi_da.c
@@ -2775,16 +2775,23 @@
 
 	softc = (struct da_softc *)malloc(sizeof(*softc), M_DEVBUF,
 	    M_NOWAIT|M_ZERO);
-
 	if (softc == NULL) {
 		printf("daregister: Unable to probe new device. "
 		       "Unable to allocate softc\n");
 		return(CAM_REQ_CMP_ERR);
 	}
 
+	if ((softc->disk = disk_alloc_nowait()) == NULL) {
+		printf("daregister: Unable to probe new device. "
+		       "Unable to allocate disk\n");
+		free(softc, M_DEVBUF);
+		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");
+		disk_free(softc->disk);
 		free(softc, M_DEVBUF);
 		return(CAM_REQ_CMP_ERR);
 	}
@@ -2904,7 +2911,6 @@
 	/*
 	 * Register this media as a disk.
 	 */
-	softc->disk = disk_alloc();
 	softc->disk->d_devstat = devstat_new_entry(periph->periph_name,
 			  periph->unit_number, 0,
 			  DEVSTAT_BS_UNAVAILABLE,