Index: head/sys/dev/ahci/ahci.c
===================================================================
--- head/sys/dev/ahci/ahci.c
+++ head/sys/dev/ahci/ahci.c
@@ -982,18 +982,22 @@
 	struct ahci_channel *ch = device_get_softc(dev);
 	struct ahci_dc_cb_args dcba;
 	size_t rfsize;
+	int error;
 
 	/* Command area. */
-	if (bus_dma_tag_create(bus_get_dma_tag(dev), 1024, 0,
+	error = bus_dma_tag_create(bus_get_dma_tag(dev), 1024, 0,
 	    BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR,
 	    NULL, NULL, AHCI_WORK_SIZE, 1, AHCI_WORK_SIZE,
-	    0, NULL, NULL, &ch->dma.work_tag))
+	    0, NULL, NULL, &ch->dma.work_tag);
+	if (error != 0)
 		goto error;
-	if (bus_dmamem_alloc(ch->dma.work_tag, (void **)&ch->dma.work,
-	    BUS_DMA_ZERO, &ch->dma.work_map))
+	error = bus_dmamem_alloc(ch->dma.work_tag, (void **)&ch->dma.work,
+	    BUS_DMA_ZERO, &ch->dma.work_map);
+	if (error != 0)
 		goto error;
-	if (bus_dmamap_load(ch->dma.work_tag, ch->dma.work_map, ch->dma.work,
-	    AHCI_WORK_SIZE, ahci_dmasetupc_cb, &dcba, 0) || dcba.error) {
+	error = bus_dmamap_load(ch->dma.work_tag, ch->dma.work_map, ch->dma.work,
+	    AHCI_WORK_SIZE, ahci_dmasetupc_cb, &dcba, BUS_DMA_NOWAIT);
+	if (error != 0 || (error = dcba.error) != 0) {
 		bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
 		goto error;
 	}
@@ -1003,33 +1007,37 @@
 	    rfsize = 4096;
 	else
 	    rfsize = 256;
-	if (bus_dma_tag_create(bus_get_dma_tag(dev), rfsize, 0,
+	error = bus_dma_tag_create(bus_get_dma_tag(dev), rfsize, 0,
 	    BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR,
 	    NULL, NULL, rfsize, 1, rfsize,
-	    0, NULL, NULL, &ch->dma.rfis_tag))
+	    0, NULL, NULL, &ch->dma.rfis_tag);
+	if (error != 0)
 		goto error;
-	if (bus_dmamem_alloc(ch->dma.rfis_tag, (void **)&ch->dma.rfis, 0,
-	    &ch->dma.rfis_map))
+	error = bus_dmamem_alloc(ch->dma.rfis_tag, (void **)&ch->dma.rfis, 0,
+	    &ch->dma.rfis_map);
+	if (error != 0)
 		goto error;
-	if (bus_dmamap_load(ch->dma.rfis_tag, ch->dma.rfis_map, ch->dma.rfis,
-	    rfsize, ahci_dmasetupc_cb, &dcba, 0) || dcba.error) {
+	error = bus_dmamap_load(ch->dma.rfis_tag, ch->dma.rfis_map, ch->dma.rfis,
+	    rfsize, ahci_dmasetupc_cb, &dcba, BUS_DMA_NOWAIT);
+	if (error != 0 || (error = dcba.error) != 0) {
 		bus_dmamem_free(ch->dma.rfis_tag, ch->dma.rfis, ch->dma.rfis_map);
 		goto error;
 	}
 	ch->dma.rfis_bus = dcba.maddr;
 	/* Data area. */
-	if (bus_dma_tag_create(bus_get_dma_tag(dev), 2, 0,
+	error = bus_dma_tag_create(bus_get_dma_tag(dev), 2, 0,
 	    BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR,
 	    NULL, NULL,
 	    AHCI_SG_ENTRIES * PAGE_SIZE * ch->numslots,
 	    AHCI_SG_ENTRIES, AHCI_PRD_MAX,
-	    0, busdma_lock_mutex, &ch->mtx, &ch->dma.data_tag)) {
+	    0, busdma_lock_mutex, &ch->mtx, &ch->dma.data_tag);
+	if (error != 0)
 		goto error;
-	}
 	return;
 
 error:
-	device_printf(dev, "WARNING - DMA initialization failed\n");
+	device_printf(dev, "WARNING - DMA initialization failed, error %d\n",
+	    error);
 	ahci_dmafini(dev);
 }