Fix compiler warnings, mostly signed issues,

when USB modules are compiled with WARNS=9.

MFC after:	1 weeks

59 files changed, 242 insertions, 255 deletions

diff --git a/sys/dev/usb/controller/at91dci.c b/sys/dev/usb/controller/at91dci.c
index d325812..e7d5e6e 100644
--- a/sys/dev/usb/controller/at91dci.c
+++ b/sys/dev/usb/controller/at91dci.c
@@ -1725,14 +1725,13 @@ static const struct at91dci_config_desc at91dci_confd = {
 	},
 };
 
+#define	HSETW(ptr, val) ptr = { (uint8_t)(val), (uint8_t)((val) >> 8) }
+
 static const struct usb_hub_descriptor_min at91dci_hubd = {
 	.bDescLength = sizeof(at91dci_hubd),
 	.bDescriptorType = UDESC_HUB,
 	.bNbrPorts = 1,
-	.wHubCharacteristics[0] =
-	(UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL) & 0xFF,
-	.wHubCharacteristics[1] =
-	(UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL) >> 8,
+	HSETW(.wHubCharacteristics, (UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL)),
 	.bPwrOn2PwrGood = 50,
 	.bHubContrCurrent = 0,
 	.DeviceRemovable = {0},		/* port is removable */
diff --git a/sys/dev/usb/controller/atmegadci.c b/sys/dev/usb/controller/atmegadci.c
index 7db3bdb..700ca8f 100644
--- a/sys/dev/usb/controller/atmegadci.c
+++ b/sys/dev/usb/controller/atmegadci.c
@@ -1548,14 +1548,13 @@ static const struct atmegadci_config_desc atmegadci_confd = {
 	},
 };
 
+#define	HSETW(ptr, val) ptr = { (uint8_t)(val), (uint8_t)((val) >> 8) }
+
 static const struct usb_hub_descriptor_min atmegadci_hubd = {
 	.bDescLength = sizeof(atmegadci_hubd),
 	.bDescriptorType = UDESC_HUB,
 	.bNbrPorts = 1,
-	.wHubCharacteristics[0] =
-	(UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL) & 0xFF,
-	.wHubCharacteristics[1] =
-	(UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL) >> 8,
+	HSETW(.wHubCharacteristics, (UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL)),
 	.bPwrOn2PwrGood = 50,
 	.bHubContrCurrent = 0,
 	.DeviceRemovable = {0},		/* port is removable */
diff --git a/sys/dev/usb/controller/avr32dci.c b/sys/dev/usb/controller/avr32dci.c
index 9494c30..9f9cd5d 100644
--- a/sys/dev/usb/controller/avr32dci.c
+++ b/sys/dev/usb/controller/avr32dci.c
@@ -1489,14 +1489,13 @@ static const struct avr32dci_config_desc avr32dci_confd = {
 	},
 };
 
+#define	HSETW(ptr, val) ptr = { (uint8_t)(val), (uint8_t)((val) >> 8) }
+
 static const struct usb_hub_descriptor_min avr32dci_hubd = {
 	.bDescLength = sizeof(avr32dci_hubd),
 	.bDescriptorType = UDESC_HUB,
 	.bNbrPorts = 1,
-	.wHubCharacteristics[0] =
-	(UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL) & 0xFF,
-	.wHubCharacteristics[1] =
-	(UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL) >> 8,
+	HSETW(.wHubCharacteristics, (UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL)),
 	.bPwrOn2PwrGood = 50,
 	.bHubContrCurrent = 0,
 	.DeviceRemovable = {0},		/* port is removable */
diff --git a/sys/dev/usb/controller/dwc_otg.c b/sys/dev/usb/controller/dwc_otg.c
index fee1207..f3ef19a 100644
--- a/sys/dev/usb/controller/dwc_otg.c
+++ b/sys/dev/usb/controller/dwc_otg.c
@@ -2057,14 +2057,13 @@ static const struct dwc_otg_config_desc dwc_otg_confd = {
 	},
 };
 
+#define	HSETW(ptr, val) ptr = { (uint8_t)(val), (uint8_t)((val) >> 8) }
+
 static const struct usb_hub_descriptor_min dwc_otg_hubd = {
 	.bDescLength = sizeof(dwc_otg_hubd),
 	.bDescriptorType = UDESC_HUB,
 	.bNbrPorts = 1,
-	.wHubCharacteristics[0] =
-	(UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL) & 0xFF,
-	.wHubCharacteristics[1] =
-	(UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL) >> 8,
+	HSETW(.wHubCharacteristics, (UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL)),
 	.bPwrOn2PwrGood = 50,
 	.bHubContrCurrent = 0,
 	.DeviceRemovable = {0},		/* port is removable */
diff --git a/sys/dev/usb/controller/ehci.c b/sys/dev/usb/controller/ehci.c
index f59c801..da37954 100644
--- a/sys/dev/usb/controller/ehci.c
+++ b/sys/dev/usb/controller/ehci.c
@@ -3011,13 +3011,8 @@ static const struct ehci_config_desc ehci_confd = {
 static const
 struct usb_hub_descriptor ehci_hubd =
 {
-	0,				/* dynamic length */
-	UDESC_HUB,
-	0,
-	{0, 0},
-	0,
-	0,
-	{0},
+	.bDescLength = 0,		/* dynamic length */
+	.bDescriptorType = UDESC_HUB,
 };
 
 static void
diff --git a/sys/dev/usb/controller/musb_otg.c b/sys/dev/usb/controller/musb_otg.c
index d463052..db0d54f 100644
--- a/sys/dev/usb/controller/musb_otg.c
+++ b/sys/dev/usb/controller/musb_otg.c
@@ -2192,14 +2192,13 @@ static const struct musbotg_config_desc musbotg_confd = {
 	},
 };
 
+#define	HSETW(ptr, val) ptr = { (uint8_t)(val), (uint8_t)((val) >> 8) }
+
 static const struct usb_hub_descriptor_min musbotg_hubd = {
 	.bDescLength = sizeof(musbotg_hubd),
 	.bDescriptorType = UDESC_HUB,
 	.bNbrPorts = 1,
-	.wHubCharacteristics[0] =
-	(UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL) & 0xFF,
-	.wHubCharacteristics[1] =
-	(UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL) >> 16,
+	HSETW(.wHubCharacteristics, (UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL)),
 	.bPwrOn2PwrGood = 50,
 	.bHubContrCurrent = 0,
 	.DeviceRemovable = {0},		/* port is removable */
diff --git a/sys/dev/usb/controller/ohci.c b/sys/dev/usb/controller/ohci.c
index 93c2bb2..a3179f1 100644
--- a/sys/dev/usb/controller/ohci.c
+++ b/sys/dev/usb/controller/ohci.c
@@ -2080,13 +2080,8 @@ struct ohci_config_desc ohci_confd =
 static const
 struct usb_hub_descriptor ohci_hubd =
 {
-	0,				/* dynamic length */
-	UDESC_HUB,
-	0,
-	{0, 0},
-	0,
-	0,
-	{0},
+	.bDescLength = 0,	/* dynamic length */
+	.bDescriptorType = UDESC_HUB,
 };
 
 static usb_error_t
diff --git a/sys/dev/usb/controller/uhci.c b/sys/dev/usb/controller/uhci.c
index d9091c9..c7a8c19 100644
--- a/sys/dev/usb/controller/uhci.c
+++ b/sys/dev/usb/controller/uhci.c
@@ -2351,13 +2351,11 @@ static const struct uhci_config_desc uhci_confd = {
 static const
 struct usb_hub_descriptor_min uhci_hubd_piix =
 {
-	sizeof(uhci_hubd_piix),
-	UDESC_HUB,
-	2,
-	{UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL, 0},
-	50,				/* power on to power good */
-	0,
-	{0x00},				/* both ports are removable */
+	.bDescLength = sizeof(uhci_hubd_piix),
+	.bDescriptorType = UDESC_HUB,
+	.bNbrPorts = 2,
+	.wHubCharacteristics = {UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL, 0},
+	.bPwrOn2PwrGood = 50,
 };
 
 /*
diff --git a/sys/dev/usb/controller/uss820dci.c b/sys/dev/usb/controller/uss820dci.c
index 612bc81..19229f8 100644
--- a/sys/dev/usb/controller/uss820dci.c
+++ b/sys/dev/usb/controller/uss820dci.c
@@ -1789,14 +1789,13 @@ static const struct uss820dci_config_desc uss820dci_confd = {
 	},
 };
 
+#define	HSETW(ptr, val) ptr = { (uint8_t)(val), (uint8_t)((val) >> 8) }
+
 static const struct usb_hub_descriptor_min uss820dci_hubd = {
 	.bDescLength = sizeof(uss820dci_hubd),
 	.bDescriptorType = UDESC_HUB,
 	.bNbrPorts = 1,
-	.wHubCharacteristics[0] =
-	(UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL) & 0xFF,
-	.wHubCharacteristics[1] =
-	(UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL) >> 8,
+	HSETW(.wHubCharacteristics, (UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL)),
 	.bPwrOn2PwrGood = 50,
 	.bHubContrCurrent = 0,
 	.DeviceRemovable = {0},		/* port is removable */
diff --git a/sys/dev/usb/controller/xhci.c b/sys/dev/usb/controller/xhci.c
index a9690f9..aed7edf 100644
--- a/sys/dev/usb/controller/xhci.c
+++ b/sys/dev/usb/controller/xhci.c
@@ -821,7 +821,7 @@ xhci_check_transfer(struct xhci_softc *sc, struct xhci_trb *trb)
 		offset = td_event - td->td_self;
 
 		if (offset >= 0 &&
-		    offset < sizeof(td->td_trb)) {
+		    offset < (int64_t)sizeof(td->td_trb)) {
 
 			usb_pc_cpu_invalidate(td->page_cache);
 
@@ -2805,7 +2805,7 @@ struct usb_pipe_methods xhci_device_generic_methods =
  * Simulate a hardware HUB by handling all the necessary requests.
  *------------------------------------------------------------------------*/
 
-#define	HSETW(ptr, val) ptr[0] = (uint8_t)(val), ptr[1] = (uint8_t)((val) >> 8)
+#define	HSETW(ptr, val) ptr = { (uint8_t)(val), (uint8_t)((val) >> 8) }
 
 static const
 struct usb_device_descriptor xhci_devd =
@@ -2848,8 +2848,7 @@ struct xhci_bos_desc xhci_bosd = {
 		HSETW(.wSpeedsSupported, 0x000C),
 		.bFunctionalitySupport = 8,
 		.bU1DevExitLat = 255,	/* dummy - not used */
-		.wU2DevExitLat[0] = 0x00,
-		.wU2DevExitLat[1] = 0x08,
+		.wU2DevExitLat = { 0x00, 0x08 },
 	},
 	.cidd = {
 		.bLength = sizeof(xhci_bosd.cidd),
diff --git a/sys/dev/usb/input/atp.c b/sys/dev/usb/input/atp.c
index 6cfba78..8a55e32 100644
--- a/sys/dev/usb/input/atp.c
+++ b/sys/dev/usb/input/atp.c
@@ -761,7 +761,7 @@ atp_get_pressures(int *p, const int *cur, const int *base, int n)
 		 * threshold; this will reduce the contribution from
 		 * lower pressure readings.
 		 */
-		if (p[i] <= atp_sensor_noise_threshold)
+		if ((u_int)p[i] <= atp_sensor_noise_threshold)
 			p[i] = 0; /* filter away noise */
 		else
 			p[i] -= atp_sensor_noise_threshold;
@@ -887,7 +887,7 @@ atp_match_stroke_component(atp_stroke_component *component,
 
 	delta_mickeys = pspan->loc - component->loc;
 
-	if (abs(delta_mickeys) > atp_max_delta_mickeys)
+	if ((u_int)abs(delta_mickeys) > atp_max_delta_mickeys)
 		return (FALSE); /* the finger span is too far out; no match */
 
 	component->loc          = pspan->loc;
@@ -1164,9 +1164,10 @@ static void
 atp_add_new_strokes(struct atp_softc *sc, atp_pspan *pspans_x,
     u_int n_xpspans, atp_pspan *pspans_y, u_int n_ypspans)
 {
-	int       i, j;
 	atp_pspan spans[2][ATP_MAX_PSPANS_PER_AXIS];
-	u_int     nspans[2];
+	u_int nspans[2];
+	u_int i;
+	u_int j;
 
 	/* Copy unmatched pspans into the local arrays. */
 	for (i = 0, nspans[X] = 0; i < n_xpspans; i++) {
@@ -1373,9 +1374,9 @@ atp_terminate_stroke(struct atp_softc *sc,
 static __inline boolean_t
 atp_stroke_has_small_movement(const atp_stroke *stroke)
 {
-	return ((abs(stroke->components[X].delta_mickeys) <=
+	return (((u_int)abs(stroke->components[X].delta_mickeys) <=
 		atp_small_movement_threshold) &&
-	    (abs(stroke->components[Y].delta_mickeys) <=
+	    ((u_int)abs(stroke->components[Y].delta_mickeys) <=
 		atp_small_movement_threshold));
 }
 
@@ -1388,7 +1389,7 @@ static __inline void
 atp_update_pending_mickeys(atp_stroke_component *component)
 {
 	component->pending += component->delta_mickeys;
-	if (abs(component->pending) <= atp_small_movement_threshold)
+	if ((u_int)abs(component->pending) <= atp_small_movement_threshold)
 		component->delta_mickeys = 0;
 	else {
 		/*
@@ -1690,7 +1691,7 @@ atp_attach(device_t dev)
 
 	if (usb_fifo_attach(sc->sc_usb_device, sc, &sc->sc_mutex,
 		&atp_fifo_methods, &sc->sc_fifo,
-		device_get_unit(dev), 0 - 1, uaa->info.bIfaceIndex,
+		device_get_unit(dev), -1, uaa->info.bIfaceIndex,
 		UID_ROOT, GID_OPERATOR, 0644)) {
 		goto detach;
 	}
@@ -1764,13 +1765,13 @@ atp_intr(struct usb_xfer *xfer, usb_error_t error)
 
 	switch (USB_GET_STATE(xfer)) {
 	case USB_ST_TRANSFERRED:
-		if (len > sc->sc_params->data_len) {
+		if (len > (int)sc->sc_params->data_len) {
 			DPRINTFN(ATP_LLEVEL_ERROR,
 			    "truncating large packet from %u to %u bytes\n",
 			    len, sc->sc_params->data_len);
 			len = sc->sc_params->data_len;
 		}
-		if (len < sc->sc_params->data_len)
+		if (len < (int)sc->sc_params->data_len)
 			goto tr_setup;
 
 		pc = usbd_xfer_get_frame(xfer, 0);
@@ -2213,9 +2214,9 @@ static device_method_t atp_methods[] = {
 };
 
 static driver_t atp_driver = {
-	ATP_DRIVER_NAME,
-	atp_methods,
-	sizeof(struct atp_softc)
+	.name = ATP_DRIVER_NAME,
+	.methods = atp_methods,
+	.size = sizeof(struct atp_softc)
 };
 
 static devclass_t atp_devclass;
diff --git a/sys/dev/usb/input/uep.c b/sys/dev/usb/input/uep.c
index e534b27..b468c3d 100644
--- a/sys/dev/usb/input/uep.c
+++ b/sys/dev/usb/input/uep.c
@@ -202,7 +202,7 @@ uep_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 		u_char buf[17], *p;
 		int pkt_len;
 
-		if (len > sizeof(buf)) {
+		if (len > (int)sizeof(buf)) {
 			DPRINTF("bad input length %d\n", len);
 			goto tr_setup;
 		}
@@ -329,7 +329,7 @@ uep_attach(device_t dev)
 	}
 
 	error = usb_fifo_attach(uaa->device, sc, &sc->mtx, &uep_fifo_methods,
-	    &sc->fifo, device_get_unit(dev), 0 - 1, uaa->info.bIfaceIndex,
+	    &sc->fifo, device_get_unit(dev), -1, uaa->info.bIfaceIndex,
 	    UID_ROOT, GID_OPERATOR, 0644);
 
         if (error) {
diff --git a/sys/dev/usb/input/uhid.c b/sys/dev/usb/input/uhid.c
index 929227b..a1050c6 100644
--- a/sys/dev/usb/input/uhid.c
+++ b/sys/dev/usb/input/uhid.c
@@ -170,10 +170,10 @@ uhid_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 		 * If the ID byte is non zero we allow descriptors
 		 * having multiple sizes:
 		 */
-		if ((actlen >= sc->sc_isize) ||
+		if ((actlen >= (int)sc->sc_isize) ||
 		    ((actlen > 0) && (sc->sc_iid != 0))) {
 			/* limit report length to the maximum */
-			if (actlen > sc->sc_isize)
+			if (actlen > (int)sc->sc_isize)
 				actlen = sc->sc_isize;
 			usb_fifo_put_data(sc->sc_fifo.fp[USB_FIFO_RX], pc,
 			    0, actlen, 1);
@@ -768,7 +768,7 @@ uhid_attach(device_t dev)
 
 	error = usb_fifo_attach(uaa->device, sc, &sc->sc_mtx,
 	    &uhid_fifo_methods, &sc->sc_fifo,
-	    unit, 0 - 1, uaa->info.bIfaceIndex,
+	    unit, -1, uaa->info.bIfaceIndex,
 	    UID_ROOT, GID_OPERATOR, 0644);
 	if (error) {
 		goto detach;
diff --git a/sys/dev/usb/input/ukbd.c b/sys/dev/usb/input/ukbd.c
index eb7e1d9..7f8bfd4 100644
--- a/sys/dev/usb/input/ukbd.c
+++ b/sys/dev/usb/input/ukbd.c
@@ -2047,7 +2047,7 @@ ukbd_key2scan(struct ukbd_softc *sc, int code, int shift, int up)
 		0x5c,	/* Keyboard Intl' 6 (Keypad ,) (For PC-9821 layout) */
 	};
 
-	if ((code >= 89) && (code < (89 + (sizeof(scan) / sizeof(scan[0]))))) {
+	if ((code >= 89) && (code < (int)(89 + (sizeof(scan) / sizeof(scan[0]))))) {
 		code = scan[code - 89];
 	}
 	/* Pause/Break */
diff --git a/sys/dev/usb/input/ums.c b/sys/dev/usb/input/ums.c
index a910df4..2773144 100644
--- a/sys/dev/usb/input/ums.c
+++ b/sys/dev/usb/input/ums.c
@@ -201,7 +201,7 @@ ums_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 	case USB_ST_TRANSFERRED:
 		DPRINTFN(6, "sc=%p actlen=%d\n", sc, len);
 
-		if (len > sizeof(sc->sc_temp)) {
+		if (len > (int)sizeof(sc->sc_temp)) {
 			DPRINTFN(6, "truncating large packet to %zu bytes\n",
 			    sizeof(sc->sc_temp));
 			len = sizeof(sc->sc_temp);
@@ -644,7 +644,7 @@ ums_attach(device_t dev)
 		/* Some wheels need the Z axis reversed. */
 		info->sc_flags |= UMS_FLAG_REVZ;
 	}
-	if (isize > usbd_xfer_max_framelen(sc->sc_xfer[UMS_INTR_DT])) {
+	if (isize > (int)usbd_xfer_max_framelen(sc->sc_xfer[UMS_INTR_DT])) {
 		DPRINTF("WARNING: report size, %d bytes, is larger "
 		    "than interrupt size, %d bytes!\n", isize,
 		    usbd_xfer_max_framelen(sc->sc_xfer[UMS_INTR_DT]));
@@ -698,7 +698,7 @@ ums_attach(device_t dev)
 
 	err = usb_fifo_attach(uaa->device, sc, &sc->sc_mtx,
 	    &ums_fifo_methods, &sc->sc_fifo,
-	    device_get_unit(dev), 0 - 1, uaa->info.bIfaceIndex,
+	    device_get_unit(dev), -1, uaa->info.bIfaceIndex,
   	    UID_ROOT, GID_OPERATOR, 0644);
 	if (err) {
 		goto detach;
diff --git a/sys/dev/usb/misc/ufm.c b/sys/dev/usb/misc/ufm.c
index 11bea65..032b635 100644
--- a/sys/dev/usb/misc/ufm.c
+++ b/sys/dev/usb/misc/ufm.c
@@ -156,7 +156,7 @@ ufm_attach(device_t dev)
 
 	error = usb_fifo_attach(uaa->device, sc, &sc->sc_mtx,
 	    &ufm_fifo_methods, &sc->sc_fifo,
-	    device_get_unit(dev), 0 - 1, uaa->info.bIfaceIndex,
+	    device_get_unit(dev), -1, uaa->info.bIfaceIndex,
 	    UID_ROOT, GID_OPERATOR, 0644);
 	if (error) {
 		goto detach;
diff --git a/sys/dev/usb/net/if_aue.c b/sys/dev/usb/net/if_aue.c
index fdee6b7..33ed236 100644
--- a/sys/dev/usb/net/if_aue.c
+++ b/sys/dev/usb/net/if_aue.c
@@ -740,7 +740,7 @@ aue_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 	case USB_ST_TRANSFERRED:
 
 		if ((ifp->if_drv_flags & IFF_DRV_RUNNING) &&
-		    actlen >= sizeof(pkt)) {
+		    actlen >= (int)sizeof(pkt)) {
 
 			pc = usbd_xfer_get_frame(xfer, 0);
 			usbd_copy_out(pc, 0, &pkt, sizeof(pkt));
@@ -793,7 +793,7 @@ aue_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 			}
 		} else {
 
-			if (actlen <= sizeof(stat) + ETHER_CRC_LEN) {
+			if (actlen <= (int)(sizeof(stat) + ETHER_CRC_LEN)) {
 				ifp->if_ierrors++;
 				goto tr_setup;
 			}
diff --git a/sys/dev/usb/net/if_axe.c b/sys/dev/usb/net/if_axe.c
index 02bb358..2f9929f 100644
--- a/sys/dev/usb/net/if_axe.c
+++ b/sys/dev/usb/net/if_axe.c
@@ -1037,7 +1037,7 @@ axe_rx_frame(struct usb_ether *ue, struct usb_page_cache *pc, int actlen)
 	error = 0;
 	if ((sc->sc_flags & AXE_FLAG_STD_FRAME) != 0) {
 		while (pos < actlen) {
-			if ((pos + sizeof(hdr)) > actlen) {
+			if ((int)(pos + sizeof(hdr)) > actlen) {
 				/* too little data */
 				error = EINVAL;
 				break;
@@ -1061,7 +1061,7 @@ axe_rx_frame(struct usb_ether *ue, struct usb_page_cache *pc, int actlen)
 		}
 	} else if ((sc->sc_flags & AXE_FLAG_CSUM_FRAME) != 0) {
 		while (pos < actlen) {
-			if ((pos + sizeof(csum_hdr)) > actlen) {
+			if ((int)(pos + sizeof(csum_hdr)) > actlen) {
 				/* too little data */
 				error = EINVAL;
 				break;
diff --git a/sys/dev/usb/net/if_cdce.c b/sys/dev/usb/net/if_cdce.c
index eabf9c6..780efe8 100644
--- a/sys/dev/usb/net/if_cdce.c
+++ b/sys/dev/usb/net/if_cdce.c
@@ -303,8 +303,8 @@ cdce_ncm_init(struct cdce_softc *sc)
 	int err;
 
 	ufd = usbd_find_descriptor(sc->sc_ue.ue_udev, NULL,
-	    sc->sc_ifaces_index[1], UDESC_CS_INTERFACE, 0 - 1,
-	    UCDC_NCM_FUNC_DESC_SUBTYPE, 0 - 1);
+	    sc->sc_ifaces_index[1], UDESC_CS_INTERFACE, 0xFF,
+	    UCDC_NCM_FUNC_DESC_SUBTYPE, 0xFF);
 
 	/* verify length of NCM functional descriptor */
 	if (ufd != NULL) {
@@ -514,7 +514,7 @@ cdce_attach(device_t dev)
 
 	ud = usbd_find_descriptor
 	    (uaa->device, NULL, uaa->info.bIfaceIndex,
-	    UDESC_CS_INTERFACE, 0 - 1, UDESCSUB_CDC_UNION, 0 - 1);
+	    UDESC_CS_INTERFACE, 0xFF, UDESCSUB_CDC_UNION, 0xFF);
 
 	if ((ud == NULL) || (ud->bLength < sizeof(*ud)) ||
 	    (sc->sc_flags & CDCE_FLAG_NO_UNION)) {
@@ -598,7 +598,7 @@ alloc_transfers:
 
 	ued = usbd_find_descriptor
 	    (uaa->device, NULL, uaa->info.bIfaceIndex,
-	    UDESC_CS_INTERFACE, 0 - 1, UDESCSUB_CDC_ENF, 0 - 1);
+	    UDESC_CS_INTERFACE, 0xFF, UDESCSUB_CDC_ENF, 0xFF);
 
 	if ((ued == NULL) || (ued->bLength < sizeof(*ued))) {
 		error = USB_ERR_INVAL;
@@ -892,7 +892,9 @@ cdce_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 	struct cdce_softc *sc = usbd_xfer_softc(xfer);
 	struct mbuf *m;
 	uint8_t x;
-	int actlen, aframes, len;
+	int actlen;
+	int aframes;
+	int len;
 
 	usbd_xfer_status(xfer, &actlen, NULL, &aframes, NULL);
 
@@ -911,7 +913,7 @@ cdce_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 			if ((sc->sc_flags & CDCE_FLAG_ZAURUS) && len >= 14)
 				len -= 4;
 
-			if (len < sizeof(struct ether_header)) {
+			if (len < (int)sizeof(struct ether_header)) {
 				m_freem(m);
 				continue;
 			}
@@ -1096,7 +1098,7 @@ cdce_ncm_fill_tx_frames(struct usb_xfer *xfer, uint8_t index)
 			break;
 		}
 
-		if (m->m_pkthdr.len > rem) {
+		if (m->m_pkthdr.len > (int)rem) {
 			if (n == 0) {
 				/* The frame won't fit in our buffer */
 				DPRINTFN(1, "Frame too big to be transmitted!\n");
@@ -1278,7 +1280,7 @@ cdce_ncm_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 		DPRINTFN(1, "received %u bytes in %u frames\n",
 		    actlen, aframes);
 
-		if (actlen < (sizeof(sc->sc_ncm.hdr) +
+		if (actlen < (int)(sizeof(sc->sc_ncm.hdr) +
 		    sizeof(sc->sc_ncm.dpt))) {
 			DPRINTFN(1, "frame too short\n");
 			goto tr_setup;
@@ -1305,7 +1307,7 @@ cdce_ncm_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 			goto tr_stall;
 		}
 		temp = UGETW(sc->sc_ncm.hdr.wDptIndex);
-		if ((temp + sizeof(sc->sc_ncm.dpt)) > actlen) {
+		if ((int)(temp + sizeof(sc->sc_ncm.dpt)) > actlen) {
 			DPRINTFN(1, "invalid DPT index: 0x%04x\n", temp);
 			goto tr_stall;
 		}
@@ -1354,7 +1356,7 @@ cdce_ncm_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 			temp = UGETW(sc->sc_ncm.dp[x].wFrameLength);
 
 			if ((offset == 0) ||
-			    (temp < sizeof(struct ether_header)) ||
+			    (temp < (int)sizeof(struct ether_header)) ||
 			    (temp > (MCLBYTES - ETHER_ALIGN))) {
 				DPRINTFN(1, "NULL frame detected at %d\n", x);
 				m = NULL;
@@ -1366,7 +1368,7 @@ cdce_ncm_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 				m = NULL;
 				/* silently ignore this frame */
 				continue;
-			} else if (temp > (MHLEN - ETHER_ALIGN)) {
+			} else if (temp > (int)(MHLEN - ETHER_ALIGN)) {
 				m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
 			} else {
 				m = m_gethdr(M_DONTWAIT, MT_DATA);
diff --git a/sys/dev/usb/net/if_cue.c b/sys/dev/usb/net/if_cue.c
index 7466ba9..30c5247a 100644
--- a/sys/dev/usb/net/if_cue.c
+++ b/sys/dev/usb/net/if_cue.c
@@ -457,7 +457,7 @@ cue_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 	switch (USB_GET_STATE(xfer)) {
 	case USB_ST_TRANSFERRED:
 
-		if (actlen <= (2 + sizeof(struct ether_header))) {
+		if (actlen <= (int)(2 + sizeof(struct ether_header))) {
 			ifp->if_ierrors++;
 			goto tr_setup;
 		}
diff --git a/sys/dev/usb/net/if_ipheth.c b/sys/dev/usb/net/if_ipheth.c
index ad4b6f1..21db100 100644
--- a/sys/dev/usb/net/if_ipheth.c
+++ b/sys/dev/usb/net/if_ipheth.c
@@ -471,7 +471,7 @@ ipheth_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 			sc->sc_rx_buf[x] = NULL;
 			len = usbd_xfer_frame_len(xfer, x);
 
-			if (len < (sizeof(struct ether_header) +
+			if (len < (int)(sizeof(struct ether_header) +
 			    IPHETH_RX_ADJ)) {
 				m_freem(m);
 				continue;
diff --git a/sys/dev/usb/net/if_kue.c b/sys/dev/usb/net/if_kue.c
index 2d3fc42..791c73a 100644
--- a/sys/dev/usb/net/if_kue.c
+++ b/sys/dev/usb/net/if_kue.c
@@ -545,7 +545,7 @@ kue_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 	switch (USB_GET_STATE(xfer)) {
 	case USB_ST_TRANSFERRED:
 
-		if (actlen <= (2 + sizeof(struct ether_header))) {
+		if (actlen <= (int)(2 + sizeof(struct ether_header))) {
 			ifp->if_ierrors++;
 			goto tr_setup;
 		}
diff --git a/sys/dev/usb/net/if_rue.c b/sys/dev/usb/net/if_rue.c
index a870676..894e368 100644
--- a/sys/dev/usb/net/if_rue.c
+++ b/sys/dev/usb/net/if_rue.c
@@ -638,7 +638,7 @@ rue_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 	case USB_ST_TRANSFERRED:
 
 		if (ifp && (ifp->if_drv_flags & IFF_DRV_RUNNING) &&
-		    actlen >= sizeof(pkt)) {
+		    actlen >= (int)sizeof(pkt)) {
 
 			pc = usbd_xfer_get_frame(xfer, 0);
 			usbd_copy_out(pc, 0, &pkt, sizeof(pkt));
diff --git a/sys/dev/usb/net/if_udav.c b/sys/dev/usb/net/if_udav.c
index 8160a3b..2507846 100644
--- a/sys/dev/usb/net/if_udav.c
+++ b/sys/dev/usb/net/if_udav.c
@@ -642,7 +642,7 @@ udav_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 	switch (USB_GET_STATE(xfer)) {
 	case USB_ST_TRANSFERRED:
 
-		if (actlen < sizeof(stat) + ETHER_CRC_LEN) {
+		if (actlen < (int)(sizeof(stat) + ETHER_CRC_LEN)) {
 			ifp->if_ierrors++;
 			goto tr_setup;
 		}
diff --git a/sys/dev/usb/net/if_usie.c b/sys/dev/usb/net/if_usie.c
index ed9054f..813a781 100644
--- a/sys/dev/usb/net/if_usie.c
+++ b/sys/dev/usb/net/if_usie.c
@@ -918,7 +918,7 @@ tr_setup:
 		if (m == NULL)
 			break;
 
-		if (m->m_pkthdr.len > (MCLBYTES - ETHER_HDR_LEN +
+		if (m->m_pkthdr.len > (int)(MCLBYTES - ETHER_HDR_LEN +
 		    ETHER_CRC_LEN - sizeof(sc->sc_txd))) {
 			DPRINTF("packet len is too big: %d\n",
 			    m->m_pkthdr.len);
diff --git a/sys/dev/usb/net/ruephy.c b/sys/dev/usb/net/ruephy.c
index 839c022..bb9931e 100644
--- a/sys/dev/usb/net/ruephy.c
+++ b/sys/dev/usb/net/ruephy.c
@@ -67,9 +67,9 @@ static device_method_t ruephy_methods[] = {
 static devclass_t ruephy_devclass;
 
 static driver_t ruephy_driver = {
-	"ruephy",
-	ruephy_methods,
-	sizeof(struct mii_softc)
+	.name = "ruephy",
+	.methods = ruephy_methods,
+	.size = sizeof(struct mii_softc)
 };
 
 DRIVER_MODULE(ruephy, miibus, ruephy_driver, ruephy_devclass, 0, 0);
diff --git a/sys/dev/usb/net/uhso.c b/sys/dev/usb/net/uhso.c
index 8211170..e741719 100644
--- a/sys/dev/usb/net/uhso.c
+++ b/sys/dev/usb/net/uhso.c
@@ -482,9 +482,9 @@ static device_method_t uhso_methods[] = {
 };
 
 static driver_t uhso_driver = {
-	"uhso",
-	uhso_methods,
-	sizeof(struct uhso_softc)
+	.name = "uhso",
+	.methods = uhso_methods,
+	.size = sizeof(struct uhso_softc)
 };
 
 static devclass_t uhso_devclass;
@@ -1366,7 +1366,7 @@ uhso_bs_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 			UHSO_DPRINTF(0, "UCDC notification too short: %d\n", actlen);
 			goto tr_setup;
 		}
-		else if (actlen > sizeof(struct usb_cdc_notification)) {
+		else if (actlen > (int)sizeof(struct usb_cdc_notification)) {
 			UHSO_DPRINTF(0, "UCDC notification too large: %d\n", actlen);
 			actlen = sizeof(struct usb_cdc_notification);
 		}
diff --git a/sys/dev/usb/serial/ubsa.c b/sys/dev/usb/serial/ubsa.c
index c29d75d..da96052 100644
--- a/sys/dev/usb/serial/ubsa.c
+++ b/sys/dev/usb/serial/ubsa.c
@@ -627,7 +627,7 @@ ubsa_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 	switch (USB_GET_STATE(xfer)) {
 	case USB_ST_TRANSFERRED:
 
-		if (actlen >= sizeof(buf)) {
+		if (actlen >= (int)sizeof(buf)) {
 			pc = usbd_xfer_get_frame(xfer, 0);
 			usbd_copy_out(pc, 0, buf, sizeof(buf));
 
diff --git a/sys/dev/usb/serial/uchcom.c b/sys/dev/usb/serial/uchcom.c
index 2b12029..b592497 100644
--- a/sys/dev/usb/serial/uchcom.c
+++ b/sys/dev/usb/serial/uchcom.c
@@ -846,9 +846,9 @@ static device_method_t uchcom_methods[] = {
 };
 
 static driver_t uchcom_driver = {
-	"ucom",
-	uchcom_methods,
-	sizeof(struct uchcom_softc)
+	.name = "ucom",
+	.methods = uchcom_methods,
+	.size = sizeof(struct uchcom_softc)
 };
 
 static devclass_t uchcom_devclass;
diff --git a/sys/dev/usb/serial/ucycom.c b/sys/dev/usb/serial/ucycom.c
index 4a35bf5..2607872 100644
--- a/sys/dev/usb/serial/ucycom.c
+++ b/sys/dev/usb/serial/ucycom.c
@@ -519,7 +519,7 @@ ucycom_intr_read_callback(struct usb_xfer *xfer, usb_error_t error)
 	struct usb_page_cache *pc;
 	uint8_t buf[2];
 	uint32_t offset;
-	uint32_t len;
+	int len;
 	int actlen;
 
 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
diff --git a/sys/dev/usb/serial/ufoma.c b/sys/dev/usb/serial/ufoma.c
index 7233f90..2f5e756 100644
--- a/sys/dev/usb/serial/ufoma.c
+++ b/sys/dev/usb/serial/ufoma.c
@@ -684,7 +684,7 @@ ufoma_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 			DPRINTF("too short message\n");
 			goto tr_setup;
 		}
-		if (actlen > sizeof(pkt)) {
+		if (actlen > (int)sizeof(pkt)) {
 			DPRINTF("truncating message\n");
 			actlen = sizeof(pkt);
 		}
diff --git a/sys/dev/usb/serial/ulpt.c b/sys/dev/usb/serial/ulpt.c
index 063e297..1bb7385 100644
--- a/sys/dev/usb/serial/ulpt.c
+++ b/sys/dev/usb/serial/ulpt.c
@@ -543,7 +543,7 @@ ulpt_attach(device_t dev)
 	/* search through all the descriptors looking for bidir mode */
 
 	id = usbd_get_interface_descriptor(uaa->iface);
-	alt_index = 0 - 1;
+	alt_index = 0xFF;
 	while (1) {
 		if (id == NULL) {
 			break;
@@ -631,14 +631,14 @@ found:
 
 	error = usb_fifo_attach(uaa->device, sc, &sc->sc_mtx,
 	    &ulpt_fifo_methods, &sc->sc_fifo,
-	    unit, 0 - 1, uaa->info.bIfaceIndex,
+	    unit, -1, uaa->info.bIfaceIndex,
 	    UID_ROOT, GID_OPERATOR, 0644);
 	if (error) {
 		goto detach;
 	}
 	error = usb_fifo_attach(uaa->device, sc, &sc->sc_mtx,
 	    &unlpt_fifo_methods, &sc->sc_fifo_noreset,
-	    unit, 0 - 1, uaa->info.bIfaceIndex,
+	    unit, -1, uaa->info.bIfaceIndex,
 	    UID_ROOT, GID_OPERATOR, 0644);
 	if (error) {
 		goto detach;
diff --git a/sys/dev/usb/serial/umodem.c b/sys/dev/usb/serial/umodem.c
index 9289eec..2da5c05 100644
--- a/sys/dev/usb/serial/umodem.c
+++ b/sys/dev/usb/serial/umodem.c
@@ -317,7 +317,7 @@ umodem_attach(device_t dev)
 
 		cud = usbd_find_descriptor(uaa->device, NULL,
 		    uaa->info.bIfaceIndex, UDESC_CS_INTERFACE,
-		    0 - 1, UDESCSUB_CDC_UNION, 0 - 1);
+		    0xFF, UDESCSUB_CDC_UNION, 0xFF);
 
 		if ((cud == NULL) || (cud->bLength < sizeof(*cud))) {
 			DPRINTF("Missing descriptor. "
@@ -702,7 +702,7 @@ umodem_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 			    "%d bytes\n", actlen);
 			goto tr_setup;
 		}
-		if (actlen > sizeof(pkt)) {
+		if (actlen > (int)sizeof(pkt)) {
 			DPRINTF("truncating message\n");
 			actlen = sizeof(pkt);
 		}
@@ -842,7 +842,7 @@ static void *
 umodem_get_desc(struct usb_attach_arg *uaa, uint8_t type, uint8_t subtype)
 {
 	return (usbd_find_descriptor(uaa->device, NULL, uaa->info.bIfaceIndex,
-	    type, 0 - 1, subtype, 0 - 1));
+	    type, 0xFF, subtype, 0xFF));
 }
 
 static usb_error_t
diff --git a/sys/dev/usb/serial/uplcom.c b/sys/dev/usb/serial/uplcom.c
index f868a53..37a91ae 100644
--- a/sys/dev/usb/serial/uplcom.c
+++ b/sys/dev/usb/serial/uplcom.c
@@ -606,7 +606,7 @@ uplcom_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
 	    &req, NULL, 0, 1000);
 }
 
-static const int32_t uplcom_rates[] = {
+static const uint32_t uplcom_rates[] = {
 	75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, 14400,
 	19200, 28800, 38400, 57600, 115200,
 	/*
diff --git a/sys/dev/usb/serial/usb_serial.c b/sys/dev/usb/serial/usb_serial.c
index 08ce2ca..a2c1f97 100644
--- a/sys/dev/usb/serial/usb_serial.c
+++ b/sys/dev/usb/serial/usb_serial.c
@@ -236,14 +236,14 @@ ucom_unit_free(int unit)
  */
 int
 ucom_attach(struct ucom_super_softc *ssc, struct ucom_softc *sc,
-    uint32_t subunits, void *parent,
+    int subunits, void *parent,
     const struct ucom_callback *callback, struct mtx *mtx)
 {
-	uint32_t subunit;
+	int subunit;
 	int error = 0;
 
 	if ((sc == NULL) ||
-	    (subunits == 0) ||
+	    (subunits <= 0) ||
 	    (callback == NULL)) {
 		return (EINVAL);
 	}
@@ -293,7 +293,7 @@ ucom_attach(struct ucom_super_softc *ssc, struct ucom_softc *sc,
 void
 ucom_detach(struct ucom_super_softc *ssc, struct ucom_softc *sc)
 {
-	uint32_t subunit;
+	int subunit;
 
 	if (ssc->sc_subunits == 0)
 		return;		/* not initialized */
@@ -1089,11 +1089,6 @@ ucom_param(struct tty *tp, struct termios *t)
 	DPRINTF("sc = %p\n", sc);
 
 	/* Check requested parameters. */
-	if (t->c_ospeed < 0) {
-		DPRINTF("negative ospeed\n");
-		error = EINVAL;
-		goto done;
-	}
 	if (t->c_ispeed && (t->c_ispeed != t->c_ospeed)) {
 		DPRINTF("mismatch ispeed and ospeed\n");
 		error = EINVAL;
diff --git a/sys/dev/usb/serial/usb_serial.h b/sys/dev/usb/serial/usb_serial.h
index ffd2859..8809264 100644
--- a/sys/dev/usb/serial/usb_serial.h
+++ b/sys/dev/usb/serial/usb_serial.h
@@ -166,7 +166,7 @@ struct ucom_softc {
 	struct tty *sc_tty;
 	struct mtx *sc_mtx;
 	void   *sc_parent;
-	uint32_t sc_subunit;
+	int sc_subunit;
 	uint16_t sc_portno;
 	uint16_t sc_flag;
 #define	UCOM_FLAG_RTS_IFLOW	0x01	/* use RTS input flow control */
@@ -194,7 +194,7 @@ struct ucom_softc {
     usbd_do_request_proc(udev,&(com)->sc_super->sc_tq,req,ptr,flags,NULL,timo)
 
 int	ucom_attach(struct ucom_super_softc *,
-	    struct ucom_softc *, uint32_t, void *,
+	    struct ucom_softc *, int, void *,
 	    const struct ucom_callback *callback, struct mtx *);
 void	ucom_detach(struct ucom_super_softc *, struct ucom_softc *);
 void	ucom_set_pnpinfo_usb(struct ucom_super_softc *, device_t);
diff --git a/sys/dev/usb/storage/umass.c b/sys/dev/usb/storage/umass.c
index a2248ea..596a5ef 100644
--- a/sys/dev/usb/storage/umass.c
+++ b/sys/dev/usb/storage/umass.c
@@ -1452,7 +1452,7 @@ umass_t_bbb_status_callback(struct usb_xfer *xfer, usb_error_t error)
 
 		/* Zero missing parts of the CSW: */
 
-		if (actlen < sizeof(sc->csw))
+		if (actlen < (int)sizeof(sc->csw))
 			memset(&sc->csw, 0, sizeof(sc->csw));
 
 		pc = usbd_xfer_get_frame(xfer, 0);
@@ -1961,7 +1961,7 @@ umass_t_cbi_status_callback(struct usb_xfer *xfer, usb_error_t error)
 	switch (USB_GET_STATE(xfer)) {
 	case USB_ST_TRANSFERRED:
 
-		if (actlen < sizeof(sc->sbl)) {
+		if (actlen < (int)sizeof(sc->sbl)) {
 			goto tr_setup;
 		}
 		pc = usbd_xfer_get_frame(xfer, 0);
diff --git a/sys/dev/usb/storage/urio.c b/sys/dev/usb/storage/urio.c
index e79ae87..39fcbe9 100644
--- a/sys/dev/usb/storage/urio.c
+++ b/sys/dev/usb/storage/urio.c
@@ -246,7 +246,7 @@ urio_attach(device_t dev)
 
 	error = usb_fifo_attach(uaa->device, sc, &sc->sc_mtx,
 	    &urio_fifo_methods, &sc->sc_fifo,
-	    device_get_unit(dev), 0 - 1, uaa->info.bIfaceIndex,
+	    device_get_unit(dev), -1, uaa->info.bIfaceIndex,
 	    UID_ROOT, GID_OPERATOR, 0644);
 	if (error) {
 		goto detach;
diff --git a/sys/dev/usb/storage/ustorage_fs.c b/sys/dev/usb/storage/ustorage_fs.c
index dd6b413..c874999 100644
--- a/sys/dev/usb/storage/ustorage_fs.c
+++ b/sys/dev/usb/storage/ustorage_fs.c
@@ -967,7 +967,7 @@ ustorage_fs_verify(struct ustorage_fs_softc *sc)
 	}
 	/* XXX TODO: verify that data is readable */
 done:
-	return (ustorage_fs_min_len(sc, 0, 0 - 1));
+	return (ustorage_fs_min_len(sc, 0, -1U));
 }
 
 /*------------------------------------------------------------------------*
@@ -989,7 +989,7 @@ ustorage_fs_inquiry(struct ustorage_fs_softc *sc)
 		memset(buf, 0, 36);
 		buf[0] = 0x7f;
 		/* Unsupported, no device - type */
-		return (ustorage_fs_min_len(sc, 36, 0 - 1));
+		return (ustorage_fs_min_len(sc, 36, -1U));
 	}
 	memset(buf, 0, 8);
 	/* Non - removable, direct - access device */
@@ -1008,7 +1008,7 @@ ustorage_fs_inquiry(struct ustorage_fs_softc *sc)
 #if (USTORAGE_QDATA_MAX < 36)
 #error "(USTORAGE_QDATA_MAX < 36)"
 #endif
-	return (ustorage_fs_min_len(sc, 36, 0 - 1));
+	return (ustorage_fs_min_len(sc, 36, -1U));
 }
 
 /*------------------------------------------------------------------------*
@@ -1077,7 +1077,7 @@ ustorage_fs_request_sense(struct ustorage_fs_softc *sc)
 #if (USTORAGE_QDATA_MAX < 18)
 #error "(USTORAGE_QDATA_MAX < 18)"
 #endif
-	return (ustorage_fs_min_len(sc, 18, 0 - 1));
+	return (ustorage_fs_min_len(sc, 18, -1U));
 }
 
 /*------------------------------------------------------------------------*
@@ -1108,7 +1108,7 @@ ustorage_fs_read_capacity(struct ustorage_fs_softc *sc)
 #if (USTORAGE_QDATA_MAX < 8)
 #error "(USTORAGE_QDATA_MAX < 8)"
 #endif
-	return (ustorage_fs_min_len(sc, 8, 0 - 1));
+	return (ustorage_fs_min_len(sc, 8, -1U));
 }
 
 /*------------------------------------------------------------------------*
@@ -1215,7 +1215,7 @@ ustorage_fs_mode_sense(struct ustorage_fs_softc *sc)
 #if (USTORAGE_QDATA_MAX < 24)
 #error "(USTORAGE_QDATA_MAX < 24)"
 #endif
-	return (ustorage_fs_min_len(sc, len, 0 - 1));
+	return (ustorage_fs_min_len(sc, len, -1U));
 }
 
 /*------------------------------------------------------------------------*
@@ -1305,7 +1305,7 @@ ustorage_fs_read_format_capacities(struct ustorage_fs_softc *sc)
 #if (USTORAGE_QDATA_MAX < 12)
 #error "(USTORAGE_QDATA_MAX < 12)"
 #endif
-	return (ustorage_fs_min_len(sc, 12, 0 - 1));
+	return (ustorage_fs_min_len(sc, 12, -1U));
 }
 
 /*------------------------------------------------------------------------*
@@ -1618,7 +1618,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 	switch (sc->sc_cmd_data[0]) {
 	case SC_INQUIRY:
 		sc->sc_transfer.cmd_dir = DIR_WRITE;
-		error = ustorage_fs_min_len(sc, sc->sc_cmd_data[4], 0 - 1);
+		error = ustorage_fs_min_len(sc, sc->sc_cmd_data[4], -1U);
 		if (error) {
 			break;
 		}
@@ -1633,7 +1633,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 
 	case SC_MODE_SELECT_6:
 		sc->sc_transfer.cmd_dir = DIR_READ;
-		error = ustorage_fs_min_len(sc, sc->sc_cmd_data[4], 0 - 1);
+		error = ustorage_fs_min_len(sc, sc->sc_cmd_data[4], -1U);
 		if (error) {
 			break;
 		}
@@ -1649,7 +1649,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 	case SC_MODE_SELECT_10:
 		sc->sc_transfer.cmd_dir = DIR_READ;
 		error = ustorage_fs_min_len(sc,
-		    get_be16(&sc->sc_cmd_data[7]), 0 - 1);
+		    get_be16(&sc->sc_cmd_data[7]), -1U);
 		if (error) {
 			break;
 		}
@@ -1664,7 +1664,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 
 	case SC_MODE_SENSE_6:
 		sc->sc_transfer.cmd_dir = DIR_WRITE;
-		error = ustorage_fs_min_len(sc, sc->sc_cmd_data[4], 0 - 1);
+		error = ustorage_fs_min_len(sc, sc->sc_cmd_data[4], -1U);
 		if (error) {
 			break;
 		}
@@ -1680,7 +1680,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 	case SC_MODE_SENSE_10:
 		sc->sc_transfer.cmd_dir = DIR_WRITE;
 		error = ustorage_fs_min_len(sc,
-		    get_be16(&sc->sc_cmd_data[7]), 0 - 1);
+		    get_be16(&sc->sc_cmd_data[7]), -1U);
 		if (error) {
 			break;
 		}
@@ -1694,7 +1694,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 		break;
 
 	case SC_PREVENT_ALLOW_MEDIUM_REMOVAL:
-		error = ustorage_fs_min_len(sc, 0, 0 - 1);
+		error = ustorage_fs_min_len(sc, 0, -1U);
 		if (error) {
 			break;
 		}
@@ -1776,7 +1776,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 	case SC_READ_FORMAT_CAPACITIES:
 		sc->sc_transfer.cmd_dir = DIR_WRITE;
 		error = ustorage_fs_min_len(sc,
-		    get_be16(&sc->sc_cmd_data[7]), 0 - 1);
+		    get_be16(&sc->sc_cmd_data[7]), -1U);
 		if (error) {
 			break;
 		}
@@ -1791,7 +1791,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 
 	case SC_REQUEST_SENSE:
 		sc->sc_transfer.cmd_dir = DIR_WRITE;
-		error = ustorage_fs_min_len(sc, sc->sc_cmd_data[4], 0 - 1);
+		error = ustorage_fs_min_len(sc, sc->sc_cmd_data[4], -1U);
 		if (error) {
 			break;
 		}
@@ -1805,7 +1805,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 		break;
 
 	case SC_START_STOP_UNIT:
-		error = ustorage_fs_min_len(sc, 0, 0 - 1);
+		error = ustorage_fs_min_len(sc, 0, -1U);
 		if (error) {
 			break;
 		}
@@ -1819,7 +1819,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 		break;
 
 	case SC_SYNCHRONIZE_CACHE:
-		error = ustorage_fs_min_len(sc, 0, 0 - 1);
+		error = ustorage_fs_min_len(sc, 0, -1U);
 		if (error) {
 			break;
 		}
@@ -1833,7 +1833,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 		break;
 
 	case SC_TEST_UNIT_READY:
-		error = ustorage_fs_min_len(sc, 0, 0 - 1);
+		error = ustorage_fs_min_len(sc, 0, -1U);
 		if (error) {
 			break;
 		}
@@ -1846,7 +1846,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 		 * We support a minimal version: BytChk must be 0.
 		 */
 	case SC_VERIFY:
-		error = ustorage_fs_min_len(sc, 0, 0 - 1);
+		error = ustorage_fs_min_len(sc, 0, -1U);
 		if (error) {
 			break;
 		}
@@ -1928,7 +1928,7 @@ ustorage_fs_do_cmd(struct ustorage_fs_softc *sc)
 		/* Fallthrough */
 
 	default:
-		error = ustorage_fs_min_len(sc, 0, 0 - 1);
+		error = ustorage_fs_min_len(sc, 0, -1U);
 		if (error) {
 			break;
 		}
diff --git a/sys/dev/usb/template/usb_template.c b/sys/dev/usb/template/usb_template.c
index b929665..9934202 100644
--- a/sys/dev/usb/template/usb_template.c
+++ b/sys/dev/usb/template/usb_template.c
@@ -374,7 +374,7 @@ usb_make_config_desc(struct usb_temp_setup *temp,
 
 	/* Reset some counters */
 
-	temp->bInterfaceNumber = 0 - 1;
+	temp->bInterfaceNumber = 0xFF;
 	temp->bAlternateSetting = 0;
 
 	/* Scan all the USB interfaces */
diff --git a/sys/dev/usb/usb_busdma.c b/sys/dev/usb/usb_busdma.c
index d31aeec..59dc8c1 100644
--- a/sys/dev/usb/usb_busdma.c
+++ b/sys/dev/usb/usb_busdma.c
@@ -108,7 +108,7 @@ usbd_get_page(struct usb_page_cache *pc, usb_frlength_t offset,
 			res->length = USB_PAGE_SIZE - offset;
 			res->physaddr = page->physaddr + offset;
 		} else {
-			res->length = 0 - 1;
+			res->length = (usb_size_t)-1;
 			res->physaddr = page->physaddr + offset;
 		}
 		if (!pc->buffer) {
@@ -123,7 +123,7 @@ usbd_get_page(struct usb_page_cache *pc, usb_frlength_t offset,
 	/* Case 2 - Plain PIO */
 
 	res->buffer = USB_ADD_BYTES(pc->buffer, offset);
-	res->length = 0 - 1;
+	res->length = (usb_size_t)-1;
 #if USB_HAVE_BUSDMA
 	res->physaddr = 0;
 #endif
diff --git a/sys/dev/usb/usb_compat_linux.c b/sys/dev/usb/usb_compat_linux.c
index 2f78d9f..22bf1f4 100644
--- a/sys/dev/usb/usb_compat_linux.c
+++ b/sys/dev/usb/usb_compat_linux.c
@@ -880,7 +880,7 @@ usb_linux_create_usb_device(struct usb_device *udev, device_t dev)
 	 */
 	for (pass = 0; pass < 2; pass++) {
 
-		iface_no_curr = 0 - 1;
+		iface_no_curr = 0xFFFF;
 		niface_total = 0;
 		iface_index = 0;
 		nedesc = 0;
diff --git a/sys/dev/usb/usb_dev.c b/sys/dev/usb/usb_dev.c
index 2b99036..a136dcd 100644
--- a/sys/dev/usb/usb_dev.c
+++ b/sys/dev/usb/usb_dev.c
@@ -1653,7 +1653,7 @@ usb_fifo_check_methods(struct usb_fifo_methods *pm)
 int
 usb_fifo_attach(struct usb_device *udev, void *priv_sc,
     struct mtx *priv_mtx, struct usb_fifo_methods *pm,
-    struct usb_fifo_sc *f_sc, uint16_t unit, uint16_t subunit,
+    struct usb_fifo_sc *f_sc, uint16_t unit, int16_t subunit,
     uint8_t iface_index, uid_t uid, gid_t gid, int mode)
 {
 	struct usb_fifo *f_tx;
@@ -1730,7 +1730,7 @@ usb_fifo_attach(struct usb_device *udev, void *priv_sc,
 		if (pm->basename[n] == NULL) {
 			continue;
 		}
-		if (subunit == 0xFFFF) {
+		if (subunit < 0) {
 			if (snprintf(devname, sizeof(devname),
 			    "%s%u%s", pm->basename[n],
 			    unit, pm->postfix[n] ?
@@ -1739,7 +1739,7 @@ usb_fifo_attach(struct usb_device *udev, void *priv_sc,
 			}
 		} else {
 			if (snprintf(devname, sizeof(devname),
-			    "%s%u.%u%s", pm->basename[n],
+			    "%s%u.%d%s", pm->basename[n],
 			    unit, subunit, pm->postfix[n] ?
 			    pm->postfix[n] : "")) {
 				/* ignore */
diff --git a/sys/dev/usb/usb_device.c b/sys/dev/usb/usb_device.c
index 726d7a7..1a7c1b6 100644
--- a/sys/dev/usb/usb_device.c
+++ b/sys/dev/usb/usb_device.c
@@ -1496,7 +1496,6 @@ usb_alloc_device(device_t parent_dev, struct usb_bus *bus,
 	struct usb_device *adev;
 	struct usb_device *hub;
 	uint8_t *scratch_ptr;
-	size_t scratch_size;
 	usb_error_t err;
 	uint8_t device_index;
 	uint8_t config_index;
@@ -1721,7 +1720,6 @@ usb_alloc_device(device_t parent_dev, struct usb_bus *bus,
 	 * simply disable all USB strings.
 	 */
 	scratch_ptr = udev->bus->scratch[0].data;
-	scratch_size = sizeof(udev->bus->scratch[0].data);
 
 	if (udev->ddesc.iManufacturer ||
 	    udev->ddesc.iProduct ||
diff --git a/sys/dev/usb/usb_handle_request.c b/sys/dev/usb/usb_handle_request.c
index 2d8d107..f5b226e 100644
--- a/sys/dev/usb/usb_handle_request.c
+++ b/sys/dev/usb/usb_handle_request.c
@@ -466,7 +466,6 @@ usb_handle_request(struct usb_xfer *xfer)
 	uint16_t rem;			/* data remainder */
 	uint16_t max_len;		/* max fragment length */
 	uint16_t wValue;
-	uint16_t wIndex;
 	uint8_t state;
 	uint8_t is_complete = 1;
 	usb_error_t err;
@@ -532,11 +531,10 @@ usb_handle_request(struct usb_xfer *xfer)
 	/* get some request fields decoded */
 
 	wValue = UGETW(req.wValue);
-	wIndex = UGETW(req.wIndex);
 
 	DPRINTF("req 0x%02x 0x%02x 0x%04x 0x%04x "
 	    "off=0x%x rem=0x%x, state=%d\n", req.bmRequestType,
-	    req.bRequest, wValue, wIndex, off, rem, state);
+	    req.bRequest, wValue, UGETW(req.wIndex), off, rem, state);
 
 	/* demultiplex the control request */
 
diff --git a/sys/dev/usb/usb_hid.c b/sys/dev/usb/usb_hid.c
index 6bd51cd..165919b 100644
--- a/sys/dev/usb/usb_hid.c
+++ b/sys/dev/usb/usb_hid.c
@@ -612,7 +612,7 @@ hid_report_size(const void *buf, usb_size_t len, enum hid_kind k, uint8_t *id)
  *	hid_locate
  *------------------------------------------------------------------------*/
 int
-hid_locate(const void *desc, usb_size_t size, uint32_t u, enum hid_kind k,
+hid_locate(const void *desc, usb_size_t size, int32_t u, enum hid_kind k,
     uint8_t index, struct hid_location *loc, uint32_t *flags, uint8_t *id)
 {
 	struct hid_data *d;
@@ -742,7 +742,7 @@ hid_put_data_unsigned(uint8_t *buf, usb_size_t len,
  *	hid_is_collection
  *------------------------------------------------------------------------*/
 int
-hid_is_collection(const void *desc, usb_size_t size, uint32_t usage)
+hid_is_collection(const void *desc, usb_size_t size, int32_t usage)
 {
 	struct hid_data *hd;
 	struct hid_item hi;
diff --git a/sys/dev/usb/usb_hub.c b/sys/dev/usb/usb_hub.c
index fe40100..bc9d98c 100644
--- a/sys/dev/usb/usb_hub.c
+++ b/sys/dev/usb/usb_hub.c
@@ -1431,7 +1431,7 @@ static uint8_t
 usb_intr_find_best_slot(usb_size_t *ptr, uint8_t start,
     uint8_t end, uint8_t mask)
 {
-	usb_size_t min = 0 - 1;
+	usb_size_t min = (usb_size_t)-1;
 	usb_size_t sum;
 	uint8_t x;
 	uint8_t y;
@@ -2149,7 +2149,7 @@ usb_bus_powerd(struct usb_bus *bus)
 
 	/* reset counters */
 
-	mintime = 0 - 1;
+	mintime = (usb_ticks_t)-1;
 	type_refs[0] = 0;
 	type_refs[1] = 0;
 	type_refs[2] = 0;
@@ -2186,7 +2186,7 @@ usb_bus_powerd(struct usb_bus *bus)
 		}
 	}
 
-	if (mintime >= (1 * hz)) {
+	if (mintime >= (usb_ticks_t)(1 * hz)) {
 		/* recompute power masks */
 		DPRINTF("Recomputing power masks\n");
 		bus->hw_power_state = 0;
diff --git a/sys/dev/usb/usb_msctest.c b/sys/dev/usb/usb_msctest.c
index a6b01b8..9952264 100644
--- a/sys/dev/usb/usb_msctest.c
+++ b/sys/dev/usb/usb_msctest.c
@@ -418,7 +418,8 @@ static void
 bbb_status_callback(struct usb_xfer *xfer, usb_error_t error)
 {
 	struct bbb_transfer *sc = usbd_xfer_softc(xfer);
-	int actlen, sumlen;
+	int actlen;
+	int sumlen;
 
 	usbd_xfer_status(xfer, &actlen, &sumlen, NULL, NULL);
 
@@ -427,7 +428,7 @@ bbb_status_callback(struct usb_xfer *xfer, usb_error_t error)
 
 		/* very simple status check */
 
-		if (actlen < sizeof(sc->csw)) {
+		if (actlen < (int)sizeof(sc->csw)) {
 			bbb_done(sc, USB_ERR_SHORT_XFER);
 		} else if (sc->csw.bCSWStatus == CSWSTATUS_GOOD) {
 			bbb_done(sc, 0);	/* success */
diff --git a/sys/dev/usb/usb_request.c b/sys/dev/usb/usb_request.c
index 3faebd3..f601154 100644
--- a/sys/dev/usb/usb_request.c
+++ b/sys/dev/usb/usb_request.c
@@ -1312,7 +1312,7 @@ usbd_req_get_config_desc(struct usb_device *udev, struct mtx *mtx,
 		goto done;
 	}
 	/* Extra sanity checking */
-	if (UGETW(d->wTotalLength) < sizeof(*d)) {
+	if (UGETW(d->wTotalLength) < (uint16_t)sizeof(*d)) {
 		err = USB_ERR_INVAL;
 	}
 done:
diff --git a/sys/dev/usb/usb_transfer.c b/sys/dev/usb/usb_transfer.c
index e948299..3e5398c 100644
--- a/sys/dev/usb/usb_transfer.c
+++ b/sys/dev/usb/usb_transfer.c
@@ -2700,7 +2700,8 @@ usbd_callback_wrapper_sub(struct usb_xfer *xfer)
 				(bus->methods->start_dma_delay) (xfer);
 			} else {
 				usbd_transfer_timeout_ms(xfer,
-				    (void *)&usb_dma_delay_done_cb, temp);
+				    (void (*)(void *))&usb_dma_delay_done_cb,
+				    temp);
 			}
 			USB_BUS_UNLOCK(bus);
 			return (1);	/* wait for new callback */
diff --git a/sys/dev/usb/usbdi.h b/sys/dev/usb/usbdi.h
index 6446720e..653f395 100644
--- a/sys/dev/usb/usbdi.h
+++ b/sys/dev/usb/usbdi.h
@@ -567,7 +567,7 @@ void	usbd_start_re_enumerate(struct usb_device *udev);
 
 int	usb_fifo_attach(struct usb_device *udev, void *priv_sc,
 	    struct mtx *priv_mtx, struct usb_fifo_methods *pm,
-	    struct usb_fifo_sc *f_sc, uint16_t unit, uint16_t subunit,
+	    struct usb_fifo_sc *f_sc, uint16_t unit, int16_t subunit,
 	    uint8_t iface_index, uid_t uid, gid_t gid, int mode);
 void	usb_fifo_detach(struct usb_fifo_sc *f_sc);
 int	usb_fifo_alloc_buffer(struct usb_fifo *f, uint32_t bufsize,
diff --git a/sys/dev/usb/usbhid.h b/sys/dev/usb/usbhid.h
index 4816e87..f40232a 100644
--- a/sys/dev/usb/usbhid.h
+++ b/sys/dev/usb/usbhid.h
@@ -226,7 +226,7 @@ void	hid_end_parse(struct hid_data *s);
 int	hid_get_item(struct hid_data *s, struct hid_item *h);
 int	hid_report_size(const void *buf, usb_size_t len, enum hid_kind k,
 	    uint8_t *id);
-int	hid_locate(const void *desc, usb_size_t size, uint32_t usage,
+int	hid_locate(const void *desc, usb_size_t size, int32_t usage,
 	    enum hid_kind kind, uint8_t index, struct hid_location *loc,
 	    uint32_t *flags, uint8_t *id);
 int32_t hid_get_data(const uint8_t *buf, usb_size_t len,
@@ -235,7 +235,7 @@ uint32_t hid_get_data_unsigned(const uint8_t *buf, usb_size_t len,
 	    struct hid_location *loc);
 void hid_put_data_unsigned(uint8_t *buf, usb_size_t len,
 	    struct hid_location *loc, unsigned int value);
-int	hid_is_collection(const void *desc, usb_size_t size, uint32_t usage);
+int	hid_is_collection(const void *desc, usb_size_t size, int32_t usage);
 struct usb_hid_descriptor *hid_get_descriptor_from_usb(
 	    struct usb_config_descriptor *cd,
 	    struct usb_interface_descriptor *id);
diff --git a/sys/dev/usb/wlan/if_rum.c b/sys/dev/usb/wlan/if_rum.c
index a809819..edd85cc 100644
--- a/sys/dev/usb/wlan/if_rum.c
+++ b/sys/dev/usb/wlan/if_rum.c
@@ -85,6 +85,8 @@ SYSCTL_INT(_hw_usb_rum, OID_AUTO, debug, CTLFLAG_RW, &rum_debug, 0,
     "Debug level");
 #endif
 
+#define N(a)	((int)(sizeof (a) / sizeof ((a)[0])))
+
 static const STRUCT_USB_HOST_ID rum_devs[] = {
 #define	RUM_DEV(v,p)  { USB_VP(USB_VENDOR_##v, USB_PRODUCT_##v##_##p) }
     RUM_DEV(ABOCOM, HWU54DM),
@@ -789,7 +791,7 @@ tr_setup:
 			STAILQ_REMOVE_HEAD(&sc->tx_q, next);
 			m = data->m;
 
-			if (m->m_pkthdr.len > (MCLBYTES + RT2573_TX_DESC_SIZE)) {
+			if (m->m_pkthdr.len > (int)(MCLBYTES + RT2573_TX_DESC_SIZE)) {
 				DPRINTFN(0, "data overflow, %u bytes\n",
 				    m->m_pkthdr.len);
 				m->m_pkthdr.len = (MCLBYTES + RT2573_TX_DESC_SIZE);
@@ -875,7 +877,7 @@ rum_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 
 		DPRINTFN(15, "rx done, actlen=%d\n", len);
 
-		if (len < RT2573_RX_DESC_SIZE + IEEE80211_MIN_LEN) {
+		if (len < (int)(RT2573_RX_DESC_SIZE + IEEE80211_MIN_LEN)) {
 			DPRINTF("%s: xfer too short %d\n",
 			    device_get_nameunit(sc->sc_dev), len);
 			ifp->if_ierrors++;
@@ -1407,7 +1409,7 @@ rum_write_multi(struct rum_softc *sc, uint16_t reg, void *buf, size_t len)
 {
 	struct usb_device_request req;
 	usb_error_t error;
-	int offset;
+	size_t offset;
 
 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
 	req.bRequest = RT2573_WRITE_MULTI_MAC;
@@ -1934,7 +1936,6 @@ rum_read_eeprom(struct rum_softc *sc)
 static int
 rum_bbp_init(struct rum_softc *sc)
 {
-#define N(a)	(sizeof (a) / sizeof ((a)[0]))
 	int i, ntries;
 
 	/* wait for BBP to be ready */
@@ -1962,13 +1963,11 @@ rum_bbp_init(struct rum_softc *sc)
 	}
 
 	return 0;
-#undef N
 }
 
 static void
 rum_init_locked(struct rum_softc *sc)
 {
-#define N(a)	(sizeof (a) / sizeof ((a)[0]))
 	struct ifnet *ifp = sc->sc_ifp;
 	struct ieee80211com *ic = ifp->if_l2com;
 	uint32_t tmp;
diff --git a/sys/dev/usb/wlan/if_run.c b/sys/dev/usb/wlan/if_run.c
index 44bb12b..ddb7395 100644
--- a/sys/dev/usb/wlan/if_run.c
+++ b/sys/dev/usb/wlan/if_run.c
@@ -74,7 +74,7 @@ __FBSDID("$FreeBSD$");
 #include <dev/usb/wlan/if_runreg.h>
 #include <dev/usb/wlan/if_runvar.h>
 
-#define nitems(_a)      (sizeof((_a)) / sizeof((_a)[0]))
+#define	N(_a) ((int)(sizeof((_a)) / sizeof((_a)[0])))
 
 #ifdef	USB_DEBUG
 #define RUN_DEBUG
@@ -658,7 +658,7 @@ run_attach(device_t self)
 	    sc->rf_rev == RT2860_RF_2850 ||
 	    sc->rf_rev == RT3070_RF_3052) {
 		/* set supported .11a rates */
-		for (i = 14; i < nitems(rt2860_rf2850); i++) {
+		for (i = 14; i < N(rt2860_rf2850); i++) {
 			uint8_t chan = rt2860_rf2850[i].chan;
 			ic->ic_channels[ic->ic_nchans].ic_freq =
 			    ieee80211_ieee2mhz(chan, IEEE80211_CHAN_A);
@@ -2574,8 +2574,8 @@ run_bulk_rx_callback(struct usb_xfer *xfer, usb_error_t error)
 
 		DPRINTFN(15, "rx done, actlen=%d\n", xferlen);
 
-		if (xferlen < sizeof (uint32_t) +
-		    sizeof (struct rt2860_rxwi) + sizeof (struct rt2870_rxd)) {
+		if (xferlen < (int)(sizeof(uint32_t) +
+		    sizeof(struct rt2860_rxwi) + sizeof(struct rt2870_rxd))) {
 			DPRINTF("xfer too short %d\n", xferlen);
 			goto tr_setup;
 		}
@@ -2640,11 +2640,12 @@ tr_setup:
 	for(;;) {
 		dmalen = le32toh(*mtod(m, uint32_t *)) & 0xffff;
 
-		if ((dmalen == 0) || ((dmalen & 3) != 0)) {
+		if ((dmalen >= (uint32_t)-8) || (dmalen == 0) ||
+		    ((dmalen & 3) != 0)) {
 			DPRINTF("bad DMA length %u\n", dmalen);
 			break;
 		}
-		if ((dmalen + 8) > xferlen) {
+		if ((dmalen + 8) > (uint32_t)xferlen) {
 			DPRINTF("bad DMA length %u > %d\n",
 			dmalen + 8, xferlen);
 			break;
@@ -4306,7 +4307,7 @@ run_bbp_init(struct run_softc *sc)
 		return (ETIMEDOUT);
 
 	/* initialize BBP registers to default values */
-	for (i = 0; i < nitems(rt2860_def_bbp); i++) {
+	for (i = 0; i < N(rt2860_def_bbp); i++) {
 		run_bbp_write(sc, rt2860_def_bbp[i].reg,
 		    rt2860_def_bbp[i].val);
 	}
@@ -4341,12 +4342,12 @@ run_rt3070_rf_init(struct run_softc *sc)
 
 	/* initialize RF registers to default value */
 	if (sc->mac_ver == 0x3572) {
-		for (i = 0; i < nitems(rt3572_def_rf); i++) {
+		for (i = 0; i < N(rt3572_def_rf); i++) {
 			run_rt3070_rf_write(sc, rt3572_def_rf[i].reg,
 			    rt3572_def_rf[i].val);
 		}
 	} else {
-		for (i = 0; i < nitems(rt3070_def_rf); i++) {
+		for (i = 0; i < N(rt3070_def_rf); i++) {
 			run_rt3070_rf_write(sc, rt3070_def_rf[i].reg,
 			    rt3070_def_rf[i].val);
 		}
@@ -4729,7 +4730,7 @@ run_init_locked(struct run_softc *sc)
 		run_write(sc, RT2860_TX_PWR_CFG(ridx), sc->txpow20mhz[ridx]);
 	}
 
-	for (i = 0; i < nitems(rt2870_def_mac); i++)
+	for (i = 0; i < N(rt2870_def_mac); i++)
 		run_write(sc, rt2870_def_mac[i].reg, rt2870_def_mac[i].val);
 	run_write(sc, RT2860_WMM_AIFSN_CFG, 0x00002273);
 	run_write(sc, RT2860_WMM_CWMIN_CFG, 0x00002344);
@@ -4949,9 +4950,9 @@ static device_method_t run_methods[] = {
 };
 
 static driver_t run_driver = {
-	"run",
-	run_methods,
-	sizeof(struct run_softc)
+	.name = "run",
+	.methods = run_methods,
+	.size = sizeof(struct run_softc)
 };
 
 static devclass_t run_devclass;
diff --git a/sys/dev/usb/wlan/if_uath.c b/sys/dev/usb/wlan/if_uath.c
index cfa8494..4e7ab0e 100644
--- a/sys/dev/usb/wlan/if_uath.c
+++ b/sys/dev/usb/wlan/if_uath.c
@@ -2309,6 +2309,11 @@ uath_cmdeof(struct uath_softc *sc, struct uath_cmd *cmd)
 	/* reply to a read command */
 	default:
 		dlen = hdr->len - sizeof(*hdr);
+		if (dlen < 0) {
+			device_printf(sc->sc_dev,
+			    "Invalid header length %d\n", dlen);
+			return;
+		}
 		DPRINTF(sc, UATH_DEBUG_RX_PROC | UATH_DEBUG_RECV_ALL,
 		    "%s: code %d data len %u\n",
 		    __func__, hdr->code & 0xff, dlen);
@@ -2334,7 +2339,7 @@ uath_cmdeof(struct uath_softc *sc, struct uath_cmd *cmd)
 			 * number of bytes--unless it's 0 in which
 			 * case a single 32-bit word should be present.
 			 */
-			if (dlen >= sizeof(uint32_t)) {
+			if (dlen >= (int)sizeof(uint32_t)) {
 				olen = be32toh(rp[0]);
 				dlen -= sizeof(uint32_t);
 				if (olen == 0) {
@@ -2346,7 +2351,7 @@ uath_cmdeof(struct uath_softc *sc, struct uath_cmd *cmd)
 				olen = 0;
 			if (cmd->odata != NULL) {
 				/* NB: cmd->olen validated in uath_cmd */
-				if (olen > cmd->olen) {
+				if (olen > (u_int)cmd->olen) {
 					/* XXX complain? */
 					device_printf(sc->sc_dev,
 					    "%s: cmd 0x%x olen %u cmd olen %u\n",
@@ -2354,7 +2359,7 @@ uath_cmdeof(struct uath_softc *sc, struct uath_cmd *cmd)
 					    cmd->olen);
 					olen = cmd->olen;
 				}
-				if (olen > dlen) {
+				if (olen > (u_int)dlen) {
 					/* XXX complain, shouldn't happen */
 					device_printf(sc->sc_dev,
 					    "%s: cmd 0x%x olen %u dlen %u\n",
@@ -2376,7 +2381,7 @@ uath_cmdeof(struct uath_softc *sc, struct uath_cmd *cmd)
 			return;
 		}
 		dlen = hdr->len - sizeof(*hdr);
-		if (dlen != sizeof(uint32_t)) {
+		if (dlen != (int)sizeof(uint32_t)) {
 			/* XXX something wrong */
 			return;
 		}
@@ -2423,7 +2428,7 @@ uath_intr_rx_callback(struct usb_xfer *xfer, usb_error_t error)
 		STAILQ_INSERT_TAIL(&sc->sc_cmd_inactive, cmd, next);
 		UATH_STAT_INC(sc, st_cmd_inactive);
 
-		KASSERT(actlen >= sizeof(struct uath_cmd_hdr),
+		KASSERT(actlen >= (int)sizeof(struct uath_cmd_hdr),
 		    ("short xfer error"));
 		pc = usbd_xfer_get_frame(xfer, 0);
 		usbd_copy_out(pc, 0, cmd->buf, actlen);
@@ -2542,7 +2547,7 @@ uath_data_rxeof(struct usb_xfer *xfer, struct uath_data *data,
 
 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 
-	if (actlen < UATH_MIN_RXBUFSZ) {
+	if (actlen < (int)UATH_MIN_RXBUFSZ) {
 		DPRINTF(sc, UATH_DEBUG_RECV | UATH_DEBUG_RECV_ALL,
 		    "%s: wrong xfer size (len=%d)\n", __func__, actlen);
 		ifp->if_ierrors++;
@@ -2888,9 +2893,9 @@ static device_method_t uath_methods[] = {
 	{ 0, 0 }
 };
 static driver_t uath_driver = {
-	"uath",
-	uath_methods,
-	sizeof(struct uath_softc)
+	.name = "uath",
+	.methods = uath_methods,
+	.size = sizeof(struct uath_softc)
 };
 static devclass_t uath_devclass;
 
diff --git a/sys/dev/usb/wlan/if_upgt.c b/sys/dev/usb/wlan/if_upgt.c
index 678e9c0..d9e9da2 100644
--- a/sys/dev/usb/wlan/if_upgt.c
+++ b/sys/dev/usb/wlan/if_upgt.c
@@ -1221,7 +1221,7 @@ upgt_eeprom_parse_freq3(struct upgt_softc *sc, uint8_t *data, int len)
 
 	for (i = 0; i < elements; i++) {
 		channel = ieee80211_mhz2ieee(le16toh(freq3[i].freq), 0);
-		if (!(channel >= 0 && channel < IEEE80211_CHAN_MAX))
+		if (channel >= IEEE80211_CHAN_MAX)
 			continue;
 
 		sc->sc_eeprom_freq3[channel] = freq3[i];
@@ -1254,7 +1254,7 @@ upgt_eeprom_parse_freq4(struct upgt_softc *sc, uint8_t *data, int len)
 
 	for (i = 0; i < elements; i++) {
 		channel = ieee80211_mhz2ieee(le16toh(freq4_1[i].freq), 0);
-		if (!(channel >= 0 && channel < IEEE80211_CHAN_MAX))
+		if (channel >= IEEE80211_CHAN_MAX)
 			continue;
 
 		freq4_2 = (struct upgt_eeprom_freq4_2 *)freq4_1[i].data;
@@ -1282,7 +1282,7 @@ upgt_eeprom_parse_freq6(struct upgt_softc *sc, uint8_t *data, int len)
 
 	for (i = 0; i < elements; i++) {
 		channel = ieee80211_mhz2ieee(le16toh(freq6[i].freq), 0);
-		if (!(channel >= 0 && channel < IEEE80211_CHAN_MAX))
+		if (channel >= IEEE80211_CHAN_MAX)
 			continue;
 
 		sc->sc_eeprom_freq6[channel] = freq6[i];
@@ -1403,7 +1403,7 @@ upgt_rxeof(struct usb_xfer *xfer, struct upgt_data *data, int *rssi)
 		return (NULL);
 	}
 
-	if (actlen < UPGT_RX_MINSZ)
+	if (actlen < (int)UPGT_RX_MINSZ)
 		return (NULL);
 
 	/*
@@ -1461,7 +1461,7 @@ upgt_rxeof(struct usb_xfer *xfer, struct upgt_data *data, int *rssi)
 static uint32_t
 upgt_chksum_le(const uint32_t *buf, size_t size)
 {
-	int i;
+	size_t i;
 	uint32_t crc = 0;
 
 	for (i = 0; i < size; i += sizeof(uint32_t)) {
@@ -1602,7 +1602,10 @@ upgt_fw_load(struct upgt_softc *sc)
 	struct upgt_data *data_cmd;
 	struct upgt_fw_x2_header *x2;
 	char start_fwload_cmd[] = { 0x3c, 0x0d };
-	int error = 0, offset, bsize, n;
+	int error = 0;
+	size_t offset;
+	int bsize;
+	int n;
 	uint32_t crc32;
 
 	fw = firmware_get(upgt_fwname);
@@ -1783,7 +1786,9 @@ upgt_fw_verify(struct upgt_softc *sc)
 	const uint8_t *p;
 	const uint32_t *uc;
 	uint32_t bra_option_type, bra_option_len;
-	int offset, bra_end = 0, error = 0;
+	size_t offset;
+	int bra_end = 0;
+	int error = 0;
 
 	fw = firmware_get(upgt_fwname);
 	if (fw == NULL) {
@@ -2382,9 +2387,9 @@ static device_method_t upgt_methods[] = {
 };
 
 static driver_t upgt_driver = {
-        "upgt",
-        upgt_methods,
-        sizeof(struct upgt_softc)
+	.name = "upgt",
+	.methods = upgt_methods,
+	.size = sizeof(struct upgt_softc)
 };
 
 static devclass_t upgt_devclass;
diff --git a/sys/dev/usb/wlan/if_ural.c b/sys/dev/usb/wlan/if_ural.c
index 945789f..d1cb91e 100644
--- a/sys/dev/usb/wlan/if_ural.c
+++ b/sys/dev/usb/wlan/if_ural.c
@@ -800,7 +800,7 @@ tr_setup:
 			STAILQ_REMOVE_HEAD(&sc->tx_q, next);
 			m = data->m;
 
-			if (m->m_pkthdr.len > (RAL_FRAME_SIZE + RAL_TX_DESC_SIZE)) {
+			if (m->m_pkthdr.len > (int)(RAL_FRAME_SIZE + RAL_TX_DESC_SIZE)) {
 				DPRINTFN(0, "data overflow, %u bytes\n",
 				    m->m_pkthdr.len);
 				m->m_pkthdr.len = (RAL_FRAME_SIZE + RAL_TX_DESC_SIZE);
@@ -881,7 +881,7 @@ ural_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 
 		DPRINTFN(15, "rx done, actlen=%d\n", len);
 
-		if (len < RAL_RX_DESC_SIZE + IEEE80211_MIN_LEN) {
+		if (len < (int)(RAL_RX_DESC_SIZE + IEEE80211_MIN_LEN)) {
 			DPRINTF("%s: xfer too short %d\n",
 			    device_get_nameunit(sc->sc_dev), len);
 			ifp->if_ierrors++;
@@ -1950,7 +1950,7 @@ ural_read_eeprom(struct ural_softc *sc)
 static int
 ural_bbp_init(struct ural_softc *sc)
 {
-#define N(a)	(sizeof (a) / sizeof ((a)[0]))
+#define N(a)	((int)(sizeof (a) / sizeof ((a)[0])))
 	int i, ntries;
 
 	/* wait for BBP to be ready */
@@ -2034,7 +2034,7 @@ ural_set_rxantenna(struct ural_softc *sc, int antenna)
 static void
 ural_init_locked(struct ural_softc *sc)
 {
-#define N(a)	(sizeof (a) / sizeof ((a)[0]))
+#define N(a)	((int)(sizeof (a) / sizeof ((a)[0])))
 	struct ifnet *ifp = sc->sc_ifp;
 	struct ieee80211com *ic = ifp->if_l2com;
 	uint16_t tmp;
diff --git a/sys/dev/usb/wlan/if_urtw.c b/sys/dev/usb/wlan/if_urtw.c
index 1259b2d..b1f5e0d 100644
--- a/sys/dev/usb/wlan/if_urtw.c
+++ b/sys/dev/usb/wlan/if_urtw.c
@@ -676,8 +676,8 @@ static void		urtw_ledtask(void *, int);
 static void		urtw_watchdog(void *);
 static void		urtw_set_multi(void *);
 static int		urtw_isbmode(uint16_t);
-static uint16_t		urtw_rate2rtl(int);
-static uint16_t		urtw_rtl2rate(int);
+static uint16_t		urtw_rate2rtl(uint32_t);
+static uint16_t		urtw_rtl2rate(uint32_t);
 static usb_error_t	urtw_set_rate(struct urtw_softc *);
 static usb_error_t	urtw_update_msr(struct urtw_softc *);
 static usb_error_t	urtw_read8_c(struct urtw_softc *, int, uint8_t *);
@@ -1092,7 +1092,7 @@ urtw_init(void *arg)
 static usb_error_t
 urtw_adapter_start_b(struct urtw_softc *sc)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	uint8_t data8;
 	usb_error_t error;
 
@@ -1939,9 +1939,9 @@ fail:
 }
 
 static uint16_t
-urtw_rate2rtl(int rate)
+urtw_rate2rtl(uint32_t rate)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	int i;
 
 	for (i = 0; i < N(urtw_ratetable); i++) {
@@ -1954,9 +1954,9 @@ urtw_rate2rtl(int rate)
 }
 
 static uint16_t
-urtw_rtl2rate(int rate)
+urtw_rtl2rate(uint32_t rate)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	int i;
 
 	for (i = 0; i < N(urtw_ratetable); i++) {
@@ -2481,7 +2481,7 @@ fail:
 static usb_error_t
 urtw_8225_rf_init(struct urtw_softc *sc)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	int i;
 	uint16_t data;
 	usb_error_t error;
@@ -2878,7 +2878,7 @@ fail:
 static usb_error_t
 urtw_8225v2_rf_init(struct urtw_softc *sc)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	int i;
 	uint16_t data;
 	uint32_t data32;
@@ -3212,7 +3212,7 @@ fail:
 static usb_error_t
 urtw_8225v2b_rf_init(struct urtw_softc *sc)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	int i;
 	uint8_t data8;
 	usb_error_t error;
@@ -3958,7 +3958,7 @@ urtw_rxeof(struct usb_xfer *xfer, struct urtw_data *data, int *rssi_p,
 
 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 
-	if (actlen < URTW_MIN_RXBUFSZ) {
+	if (actlen < (int)URTW_MIN_RXBUFSZ) {
 		ifp->if_ierrors++;
 		return (NULL);
 	}
@@ -4434,9 +4434,9 @@ static device_method_t urtw_methods[] = {
 	{ 0, 0 }
 };
 static driver_t urtw_driver = {
-	"urtw",
-	urtw_methods,
-	sizeof(struct urtw_softc)
+	.name = "urtw",
+	.methods = urtw_methods,
+	.size = sizeof(struct urtw_softc)
 };
 static devclass_t urtw_devclass;
 
diff --git a/sys/dev/usb/wlan/if_zyd.c b/sys/dev/usb/wlan/if_zyd.c
index 7e2cee9..0dac7ad 100644
--- a/sys/dev/usb/wlan/if_zyd.c
+++ b/sys/dev/usb/wlan/if_zyd.c
@@ -670,17 +670,18 @@ zyd_intr_read_callback(struct usb_xfer *xfer, usb_error_t error)
 			datalen -= 2;	/* XXX: padding? */
 
 			STAILQ_FOREACH(rqp, &sc->sc_rqh, rq) {
-				int i, cnt;
+				int i;
+				int count;
 
 				if (rqp->olen != datalen)
 					continue;
-				cnt = rqp->olen / sizeof(struct zyd_pair);
-				for (i = 0; i < cnt; i++) {
+				count = rqp->olen / sizeof(struct zyd_pair);
+				for (i = 0; i < count; i++) {
 					if (*(((const uint16_t *)rqp->idata) + i) !=
 					    (((struct zyd_pair *)cmd->data) + i)->reg)
 						break;
 				}
-				if (i != cnt)
+				if (i != count)
 					continue;
 				/* copy answer into caller-supplied buffer */
 				memcpy(rqp->odata, cmd->data, rqp->olen);
@@ -779,7 +780,7 @@ zyd_cmd(struct zyd_softc *sc, uint16_t code, const void *idata, int ilen,
 	struct zyd_rq rq;
 	int error;
 
-	if (ilen > sizeof(cmd.data))
+	if (ilen > (int)sizeof(cmd.data))
 		return (EINVAL);
 
 	cmd.code = htole16(code);
@@ -929,7 +930,7 @@ fail:
 static int
 zyd_rfmd_init(struct zyd_rf *rf)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct zyd_phy_pair phyini[] = ZYD_RFMD_PHY;
 	static const uint32_t rfini[] = ZYD_RFMD_RF;
@@ -988,7 +989,7 @@ fail:
 static int
 zyd_al2230_init(struct zyd_rf *rf)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct zyd_phy_pair phyini[] = ZYD_AL2230_PHY;
 	static const struct zyd_phy_pair phy2230s[] = ZYD_AL2230S_PHY_INIT;
@@ -1046,7 +1047,7 @@ fail:
 static int
 zyd_al2230_fini(struct zyd_rf *rf)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	int error, i;
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct zyd_phy_pair phy[] = ZYD_AL2230_PHY_FINI_PART1;
@@ -1066,7 +1067,7 @@ fail:
 static int
 zyd_al2230_init_b(struct zyd_rf *rf)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct zyd_phy_pair phy1[] = ZYD_AL2230_PHY_PART1;
 	static const struct zyd_phy_pair phy2[] = ZYD_AL2230_PHY_PART2;
@@ -1149,7 +1150,7 @@ fail:
 static int
 zyd_al2230_set_channel(struct zyd_rf *rf, uint8_t chan)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	int error, i;
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct zyd_phy_pair phy1[] = {
@@ -1179,7 +1180,7 @@ fail:
 static int
 zyd_al2230_set_channel_b(struct zyd_rf *rf, uint8_t chan)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	int error, i;
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct zyd_phy_pair phy1[] = ZYD_AL2230_PHY_PART1;
@@ -1214,7 +1215,7 @@ fail:
 static int
 zyd_al2230_bandedge6(struct zyd_rf *rf, struct ieee80211_channel *c)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	int error = 0, i;
 	struct zyd_softc *sc = rf->rf_sc;
 	struct ifnet *ifp = sc->sc_ifp;
@@ -1238,7 +1239,7 @@ fail:
 static int
 zyd_al7230B_init(struct zyd_rf *rf)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct zyd_phy_pair phyini_1[] = ZYD_AL7230B_PHY_1;
 	static const struct zyd_phy_pair phyini_2[] = ZYD_AL7230B_PHY_2;
@@ -1290,7 +1291,7 @@ fail:
 static int
 zyd_al7230B_set_channel(struct zyd_rf *rf, uint8_t chan)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct {
 		uint32_t	r1, r2;
@@ -1336,7 +1337,7 @@ fail:
 static int
 zyd_al2210_init(struct zyd_rf *rf)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct zyd_phy_pair phyini[] = ZYD_AL2210_PHY;
 	static const uint32_t rfini[] = ZYD_AL2210_RF;
@@ -1409,7 +1410,7 @@ static int
 zyd_gct_init(struct zyd_rf *rf)
 {
 #define	ZYD_GCT_INTR_REG	0x85c1
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct zyd_phy_pair phyini[] = ZYD_GCT_PHY;
 	static const uint32_t rfini[] = ZYD_GCT_RF;
@@ -1431,7 +1432,7 @@ zyd_gct_init(struct zyd_rf *rf)
 	if (error != 0)
 		return (error);
 
-	for (i = 0; i < N(vco) - 1; i++) {
+	for (i = 0; i < (int)(N(vco) - 1); i++) {
 		error = zyd_gct_set_channel_synth(rf, 1, 0);
 		if (error != 0)
 			goto fail;
@@ -1465,7 +1466,7 @@ fail:
 static int
 zyd_gct_mode(struct zyd_rf *rf)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	struct zyd_softc *sc = rf->rf_sc;
 	static const uint32_t mode[] = {
 		0x25f98, 0x25f9a, 0x25f94, 0x27fd4
@@ -1507,7 +1508,6 @@ zyd_gct_write(struct zyd_rf *rf, uint16_t value)
 static int
 zyd_gct_switch_radio(struct zyd_rf *rf, int on)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
 	int error;
 	struct zyd_softc *sc = rf->rf_sc;
 
@@ -1525,7 +1525,7 @@ fail:
 static int
 zyd_gct_set_channel(struct zyd_rf *rf, uint8_t chan)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	int error, i;
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct zyd_phy_pair cmd[] = {
@@ -1579,7 +1579,7 @@ zyd_gct_txgain(struct zyd_rf *rf, uint8_t chan)
 static int
 zyd_maxim2_init(struct zyd_rf *rf)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct zyd_phy_pair phyini[] = ZYD_MAXIM2_PHY;
 	static const uint32_t rfini[] = ZYD_MAXIM2_RF;
@@ -1616,7 +1616,7 @@ zyd_maxim2_switch_radio(struct zyd_rf *rf, int on)
 static int
 zyd_maxim2_set_channel(struct zyd_rf *rf, uint8_t chan)
 {
-#define N(a)	(sizeof(a) / sizeof((a)[0]))
+#define N(a)	((int)(sizeof(a) / sizeof((a)[0])))
 	struct zyd_softc *sc = rf->rf_sc;
 	static const struct zyd_phy_pair phyini[] = ZYD_MAXIM2_PHY;
 	static const uint32_t rfini[] = ZYD_MAXIM2_RF;
@@ -2185,12 +2185,12 @@ zyd_rx_data(struct usb_xfer *xfer, int offset, uint16_t len)
 	    sizeof(struct zyd_rx_stat) - IEEE80211_CRC_LEN;
 
 	/* allocate a mbuf to store the frame */
-	if (rlen > MCLBYTES) {
+	if (rlen > (int)MCLBYTES) {
 		DPRINTF(sc, ZYD_DEBUG_RECV, "%s: frame too long (length=%d)\n",
 		    device_get_nameunit(sc->sc_dev), rlen);
 		ifp->if_ierrors++;
 		return;
-	} else if (rlen > MHLEN)
+	} else if (rlen > (int)MHLEN)
 		m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
 	else
 		m = m_gethdr(M_DONTWAIT, MT_DATA);
@@ -2391,7 +2391,7 @@ tr_setup:
 			STAILQ_REMOVE_HEAD(&sc->tx_q, next);
 			m = data->m;
 
-			if (m->m_pkthdr.len > ZYD_MAX_TXBUFSZ) {
+			if (m->m_pkthdr.len > (int)ZYD_MAX_TXBUFSZ) {
 				DPRINTF(sc, ZYD_DEBUG_ANY, "data overflow, %u bytes\n",
 				    m->m_pkthdr.len);
 				m->m_pkthdr.len = ZYD_MAX_TXBUFSZ;
@@ -2933,9 +2933,9 @@ static device_method_t zyd_methods[] = {
 };
 
 static driver_t zyd_driver = {
-        "zyd",
-        zyd_methods,
-        sizeof(struct zyd_softc)
+	.name = "zyd",
+	.methods = zyd_methods,
+	.size = sizeof(struct zyd_softc)
 };
 
 static devclass_t zyd_devclass;