diff --git a/sys/dev/ic/aic79xx.c b/sys/dev/ic/aic79xx.c
index a66da031a0cb..4c4afc2f43e1 100644
--- a/sys/dev/ic/aic79xx.c
+++ b/sys/dev/ic/aic79xx.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: aic79xx.c,v 1.45 2011/07/02 13:12:44 mrg Exp $	*/
+/*	$NetBSD: aic79xx.c,v 1.46 2013/10/17 21:24:24 christos Exp $	*/
 
 /*
  * Core routines and tables shareable across OS platforms.
@@ -49,7 +49,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: aic79xx.c,v 1.45 2011/07/02 13:12:44 mrg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: aic79xx.c,v 1.46 2013/10/17 21:24:24 christos Exp $");
 
 #include <dev/ic/aic79xx_osm.h>
 #include <dev/ic/aic79xx_inline.h>
@@ -1025,9 +1025,10 @@ ahd_handle_seqint(struct ahd_softc *ahd, u_int intstat)
 		{
 			struct	ahd_devinfo devinfo;
 			struct	scb *scb;
+#ifdef notdef
 			struct	ahd_initiator_tinfo *targ_info;
 			struct	ahd_tmode_tstate *tstate;
-			struct	ahd_transinfo *tinfo;
+#endif
 			u_int	scbid;
 
 			/*
@@ -1055,12 +1056,13 @@ ahd_handle_seqint(struct ahd_softc *ahd, u_int intstat)
 					    SCB_GET_LUN(scb),
 					    SCB_GET_CHANNEL(ahd, scb),
 					    ROLE_INITIATOR);
+#ifdef notdef
 			targ_info = ahd_fetch_transinfo(ahd,
 							devinfo.channel,
 							devinfo.our_scsiid,
 							devinfo.target,
 							&tstate);
-			tinfo = &targ_info->curr;
+#endif
 			ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 				      AHD_TRANS_ACTIVE, /*paused*/TRUE);
 			ahd_set_syncrate(ahd, &devinfo, /*period*/0,
@@ -1747,7 +1749,6 @@ ahd_handle_transmission_error(struct ahd_softc *ahd)
 	struct	scb *scb;
 	u_int	scbid;
 	u_int	lqistat1;
-	u_int	lqistat2;
 	u_int	msg_out;
 	u_int	curphase;
 	u_int	lastphase;
@@ -1758,7 +1759,7 @@ ahd_handle_transmission_error(struct ahd_softc *ahd)
 	scb = NULL;
 	ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
 	lqistat1 = ahd_inb(ahd, LQISTAT1) & ~(LQIPHASE_LQ|LQIPHASE_NLQ);
-	lqistat2 = ahd_inb(ahd, LQISTAT2);
+	(void)ahd_inb(ahd, LQISTAT2);
 	if ((lqistat1 & (LQICRCI_NLQ|LQICRCI_LQ)) == 0
 	 && (ahd->bugs & AHD_NLQICRC_DELAYED_BUG) != 0) {
 		u_int lqistate;
@@ -2657,10 +2658,8 @@ ahd_dump_sglist(struct scb *scb)
 			sg_list = (struct ahd_dma64_seg*)scb->sg_list;
 			for (i = 0; i < scb->sg_count; i++) {
 				uint64_t addr;
-				uint32_t len;
 
 				addr = ahd_le64toh(sg_list[i].addr);
-				len = ahd_le32toh(sg_list[i].len);
 				printf("sg[%d] - Addr 0x%x%x : Length %d%s\n",
 				       i,
 				       (uint32_t)((addr >> 32) & 0xFFFFFFFF),
@@ -3288,13 +3287,12 @@ ahd_update_pending_scbs(struct ahd_softc *ahd)
 	LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
 		struct ahd_devinfo devinfo;
 		struct hardware_scb *pending_hscb;
-		struct ahd_initiator_tinfo *tinfo;
 		struct ahd_tmode_tstate *tstate;
 
 		ahd_scb_devinfo(ahd, &devinfo, pending_scb);
-		tinfo = ahd_fetch_transinfo(ahd, devinfo.channel,
-					    devinfo.our_scsiid,
-					    devinfo.target, &tstate);
+		(void)ahd_fetch_transinfo(ahd, devinfo.channel,
+					  devinfo.our_scsiid,
+					  devinfo.target, &tstate);
 		pending_hscb = pending_scb->hscb;
 		if ((tstate->auto_negotiate & devinfo.target_mask) == 0
 		 && (pending_scb->flags & SCB_AUTO_NEGOTIATE) != 0) {
@@ -7127,7 +7125,6 @@ ahd_search_qinfifo(struct ahd_softc *ahd, int target, char channel,
 	int		 found;
 	int		 targets;
 	int		 pending_cmds;
-	int		 qincount;
 
 	/* Must be in CCHAN mode */
 	saved_modes = ahd_save_modes(ahd);
@@ -7155,7 +7152,7 @@ ahd_search_qinfifo(struct ahd_softc *ahd, int target, char channel,
 	LIST_FOREACH(scb, &ahd->pending_scbs, pending_links) {
 		pending_cmds++;
 	}
-	qincount = ahd_qinfifo_count(ahd);
+	(void)ahd_qinfifo_count(ahd);
 
 	if (action == SEARCH_PRINT) {
 		printf("qinstart = 0x%x qinfifonext = 0x%x\n",
@@ -7953,7 +7950,6 @@ ahd_handle_scsi_status(struct ahd_softc *ahd, struct scb *scb)
 		struct scsi_request_sense *sc;
 		struct ahd_initiator_tinfo *targ_info;
 		struct ahd_tmode_tstate *tstate;
-		struct ahd_transinfo *tinfo;
 #ifdef AHD_DEBUG
 		if (ahd_debug & AHD_SHOW_SENSE) {
 			ahd_print_path(ahd, scb);
@@ -7975,7 +7971,6 @@ ahd_handle_scsi_status(struct ahd_softc *ahd, struct scb *scb)
 						devinfo.our_scsiid,
 						devinfo.target,
 						&tstate);
-		tinfo = &targ_info->curr;
 		sg = scb->sg_list;
 		sc = (struct scsi_request_sense *)hscb->shared_data.idata.cdb;
 		/*
diff --git a/sys/dev/ic/aic79xx_osm.c b/sys/dev/ic/aic79xx_osm.c
index 72dd90e3123b..db535e4616d0 100644
--- a/sys/dev/ic/aic79xx_osm.c
+++ b/sys/dev/ic/aic79xx_osm.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: aic79xx_osm.c,v 1.31 2010/02/24 22:37:57 dyoung Exp $	*/
+/*	$NetBSD: aic79xx_osm.c,v 1.32 2013/10/17 21:24:24 christos Exp $	*/
 
 /*
  * Bus independent NetBSD shim for the aic7xxx based adaptec SCSI controllers
@@ -41,7 +41,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: aic79xx_osm.c,v 1.31 2010/02/24 22:37:57 dyoung Exp $");
+__KERNEL_RCSID(0, "$NetBSD: aic79xx_osm.c,v 1.32 2013/10/17 21:24:24 christos Exp $");
 
 #include <dev/ic/aic79xx_osm.h>
 #include <dev/ic/aic79xx_inline.h>
@@ -739,7 +739,6 @@ ahd_timeout(void *arg)
 {
 	struct	scb	  *scb;
 	struct	ahd_softc *ahd;
-	ahd_mode_state	   saved_modes;
 	int		   s;
 
 	scb = arg;
@@ -750,7 +749,7 @@ ahd_timeout(void *arg)
 	ahd_lock(ahd, &s);
 
 	ahd_pause_and_flushwork(ahd);
-	saved_modes = ahd_save_modes(ahd);
+	(void)ahd_save_modes(ahd);
 #if 0
 	ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
 	ahd_outb(ahd, SCSISIGO, ACKO);
diff --git a/sys/dev/ic/arn5008.c b/sys/dev/ic/arn5008.c
index da4477c2d933..2bff5181f7b5 100644
--- a/sys/dev/ic/arn5008.c
+++ b/sys/dev/ic/arn5008.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: arn5008.c,v 1.3 2013/04/06 14:57:38 martin Exp $	*/
+/*	$NetBSD: arn5008.c,v 1.4 2013/10/17 21:24:24 christos Exp $	*/
 /*	$OpenBSD: ar5008.c,v 1.21 2012/08/25 12:14:31 kettenis Exp $	*/
 
 /*-
@@ -24,7 +24,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: arn5008.c,v 1.3 2013/04/06 14:57:38 martin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: arn5008.c,v 1.4 2013/10/17 21:24:24 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/sockio.h>
@@ -1181,7 +1181,7 @@ ar5008_swba_intr(struct athn_softc *sc)
 Static int
 ar5008_intr(struct athn_softc *sc)
 {
-	uint32_t intr, intr2, intr5, sync;
+	uint32_t intr, intr5, sync;
 
 	/* Get pending interrupts. */
 	intr = AR_READ(sc, AR_INTR_ASYNC_CAUSE);
@@ -1202,12 +1202,14 @@ ar5008_intr(struct athn_softc *sc)
 
 	if (intr != 0) {
 		if (intr & AR_ISR_BCNMISC) {
-			intr2 = AR_READ(sc, AR_ISR_S2);
+			uint32_t intr2 = AR_READ(sc, AR_ISR_S2);
 #if notyet
 			if (intr2 & AR_ISR_S2_TIM)
 				/* TBD */;
 			if (intr2 & AR_ISR_S2_TSFOOR)
 				/* TBD */;
+#else
+			__USE(intr2);
 #endif
 		}
 		intr = AR_READ(sc, AR_ISR_RAC);
diff --git a/sys/dev/ic/arn9003.c b/sys/dev/ic/arn9003.c
index 6fcbea4fbbc7..fdb9b40f61b8 100644
--- a/sys/dev/ic/arn9003.c
+++ b/sys/dev/ic/arn9003.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: arn9003.c,v 1.3 2013/04/06 14:57:38 martin Exp $	*/
+/*	$NetBSD: arn9003.c,v 1.4 2013/10/17 21:24:24 christos Exp $	*/
 /*	$OpenBSD: ar9003.c,v 1.25 2012/10/20 09:53:32 stsp Exp $	*/
 
 /*-
@@ -24,7 +24,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: arn9003.c,v 1.3 2013/04/06 14:57:38 martin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: arn9003.c,v 1.4 2013/10/17 21:24:24 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/sockio.h>
@@ -1339,7 +1339,7 @@ ar9003_swba_intr(struct athn_softc *sc)
 Static int
 ar9003_intr(struct athn_softc *sc)
 {
-	uint32_t intr, intr2, intr5, sync;
+	uint32_t intr, sync;
 
 	/* Get pending interrupts. */
 	intr = AR_READ(sc, AR_INTR_ASYNC_CAUSE);
@@ -1360,7 +1360,7 @@ ar9003_intr(struct athn_softc *sc)
 
 	if (intr != 0) {
 		if (intr & AR_ISR_BCNMISC) {
-			intr2 = AR_READ(sc, AR_ISR_S2);
+			uint32_t intr2 = AR_READ(sc, AR_ISR_S2);
 #ifdef notyet
 			if (intr2 & AR_ISR_S2_TIM)
 				/* TBD */;
@@ -1368,6 +1368,8 @@ ar9003_intr(struct athn_softc *sc)
 				/* TBD */;
 			if (intr2 & AR_ISR_S2_BB_WATCHDOG)
 				/* TBD */;
+#else
+			__USE(intr2);
 #endif
 		}
 		intr = AR_READ(sc, AR_ISR_RAC);
@@ -1391,11 +1393,15 @@ ar9003_intr(struct athn_softc *sc)
 			ar9003_tx_intr(sc);
 
 		if (intr & AR_ISR_GENTMR) {
-			intr5 = AR_READ(sc, AR_ISR_S5_S);
+			uint32_t intr5 = AR_READ(sc, AR_ISR_S5_S);
+#ifdef ATHN_DEBUG
 			DPRINTFN(DBG_INTR, sc,
 			    "GENTMR trigger=%d thresh=%d\n",
 			    MS(intr5, AR_ISR_S5_GENTIMER_TRIG),
 			    MS(intr5, AR_ISR_S5_GENTIMER_THRESH));
+#else
+			__USE(intr5);
+#endif
 		}
 	}
 	if (sync != 0) {
diff --git a/sys/dev/ic/arn9285.c b/sys/dev/ic/arn9285.c
index 7b4662eb5e95..69790ae74487 100644
--- a/sys/dev/ic/arn9285.c
+++ b/sys/dev/ic/arn9285.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: arn9285.c,v 1.2 2013/04/03 14:20:02 christos Exp $	*/
+/*	$NetBSD: arn9285.c,v 1.3 2013/10/17 21:24:24 christos Exp $	*/
 /*	$OpenBSD: ar9285.c,v 1.19 2012/06/10 21:23:36 kettenis Exp $	*/
 
 /*-
@@ -24,7 +24,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: arn9285.c,v 1.2 2013/04/03 14:20:02 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: arn9285.c,v 1.3 2013/10/17 21:24:24 christos Exp $");
 
 #ifndef _MODULE
 #include "athn_usb.h"
@@ -794,21 +794,25 @@ ar9285_set_txpower(struct athn_softc *sc, struct ieee80211_channel *c,
     struct ieee80211_channel *extc)
 {
 	const struct ar9285_eeprom *eep = sc->sc_eep;
+#ifdef notyet
 	const struct ar9285_modal_eep_header *modal = &eep->modalHeader;
+#endif
 	uint8_t tpow_cck[4], tpow_ofdm[4];
 #ifndef IEEE80211_NO_HT
 	uint8_t tpow_cck_ext[4], tpow_ofdm_ext[4];
 	uint8_t tpow_ht20[8], tpow_ht40[8];
 	uint8_t ht40inc;
 #endif
-	int16_t max_ant_gain, power[ATHN_POWER_COUNT];
+	int16_t power[ATHN_POWER_COUNT];
 	int i;
 
 	ar9285_set_power_calib(sc, c);
 
+#ifdef notyet
 	/* Compute transmit power reduction due to antenna gain. */
-	max_ant_gain = modal->antennaGain;
+	uint16_t max_ant_gain = modal->antennaGain;
 	/* XXX */
+#endif
 
 	/* Get CCK target powers. */
 	ar5008_get_lg_tpow(sc, c, AR_CTL_11B, eep->calTargetPowerCck,
diff --git a/sys/dev/ic/arn9287.c b/sys/dev/ic/arn9287.c
index 5a168d0536a3..477fab29db1e 100644
--- a/sys/dev/ic/arn9287.c
+++ b/sys/dev/ic/arn9287.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: arn9287.c,v 1.2 2013/04/03 14:20:02 christos Exp $	*/
+/*	$NetBSD: arn9287.c,v 1.3 2013/10/17 21:24:24 christos Exp $	*/
 /*	$OpenBSD: ar9287.c,v 1.17 2012/06/10 21:23:36 kettenis Exp $	*/
 
 /*-
@@ -24,7 +24,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: arn9287.c,v 1.2 2013/04/03 14:20:02 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: arn9287.c,v 1.3 2013/10/17 21:24:24 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/sockio.h>
@@ -433,21 +433,25 @@ ar9287_set_txpower(struct athn_softc *sc, struct ieee80211_channel *c,
     struct ieee80211_channel *extc)
 {
 	const struct ar9287_eeprom *eep = sc->sc_eep;
+#ifdef notyet
 	const struct ar9287_modal_eep_header *modal = &eep->modalHeader;
+#endif
 	uint8_t tpow_cck[4], tpow_ofdm[4];
 #ifndef IEEE80211_NO_HT
 	uint8_t tpow_cck_ext[4], tpow_ofdm_ext[4];
 	uint8_t tpow_ht20[8], tpow_ht40[8];
 	uint8_t ht40inc;
 #endif
-	int16_t pwr = 0, max_ant_gain, power[ATHN_POWER_COUNT];
+	int16_t pwr = 0, power[ATHN_POWER_COUNT];
 	int i;
 
 	ar9287_set_power_calib(sc, c);
 
+#ifdef notyet
 	/* Compute transmit power reduction due to antenna gain. */
-	max_ant_gain = MAX(modal->antennaGainCh[0], modal->antennaGainCh[1]);
+	uint16_t max_ant_gain = MAX(modal->antennaGainCh[0], modal->antennaGainCh[1]);
 	/* XXX */
+#endif
 
 	/*
 	 * Reduce scaled power by number of active chains to get per-chain
diff --git a/sys/dev/ic/athn.c b/sys/dev/ic/athn.c
index 5974fd1da139..71dfe7f5bd70 100644
--- a/sys/dev/ic/athn.c
+++ b/sys/dev/ic/athn.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: athn.c,v 1.6 2013/06/24 19:43:58 martin Exp $	*/
+/*	$NetBSD: athn.c,v 1.7 2013/10/17 21:24:24 christos Exp $	*/
 /*	$OpenBSD: athn.c,v 1.75 2013/01/14 09:50:31 jsing Exp $	*/
 
 /*-
@@ -23,7 +23,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: athn.c,v 1.6 2013/06/24 19:43:58 martin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: athn.c,v 1.7 2013/10/17 21:24:24 christos Exp $");
 
 #ifndef _MODULE
 #include "athn_usb.h"		/* for NATHN_USB */
@@ -1941,7 +1941,7 @@ athn_set_sta_timers(struct athn_softc *sc)
 	struct ieee80211com *ic = &sc->sc_ic;
 	uint32_t tsfhi, tsflo, tsftu, reg;
 	uint32_t intval, next_tbtt, next_dtim;
-	int dtim_period, dtim_count, rem_dtim_count;
+	int dtim_period, rem_dtim_count;
 
 	tsfhi = AR_READ(sc, AR_TSF_U32);
 	tsflo = AR_READ(sc, AR_TSF_L32);
@@ -1958,10 +1958,10 @@ athn_set_sta_timers(struct athn_softc *sc)
 		dtim_period = 1;	/* Assume all TIMs are DTIMs. */
 
 #ifdef notyet
-	dtim_count = ic->ic_dtim_count;
+	int dtim_count = ic->ic_dtim_count;
 	if (dtim_count >= dtim_period)	/* Should not happen. */
-#endif
 		dtim_count = 0;	/* Assume last TIM was a DTIM. */
+#endif
 
 	/* Compute number of remaining TIMs until next DTIM. */
 	rem_dtim_count = 0;	/* XXX */
diff --git a/sys/dev/ic/atw.c b/sys/dev/ic/atw.c
index 76941d9bd0a0..bb778e9161e1 100644
--- a/sys/dev/ic/atw.c
+++ b/sys/dev/ic/atw.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: atw.c,v 1.154 2013/09/14 13:10:25 joerg Exp $  */
+/*	$NetBSD: atw.c,v 1.155 2013/10/17 21:24:24 christos Exp $  */
 
 /*-
  * Copyright (c) 1998, 1999, 2000, 2002, 2003, 2004 The NetBSD Foundation, Inc.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: atw.c,v 1.154 2013/09/14 13:10:25 joerg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: atw.c,v 1.155 2013/10/17 21:24:24 christos Exp $");
 
 
 #include <sys/param.h>
@@ -902,7 +902,6 @@ void
 atw_reset(struct atw_softc *sc)
 {
 	int i;
-	uint32_t lpc;
 
 	ATW_WRITE(sc, ATW_NAR, 0x0);
 	DELAY(atw_nar_delay);
@@ -949,7 +948,7 @@ atw_reset(struct atw_softc *sc)
 
 	DELAY(atw_magic_delay4);
 
-	lpc = ATW_READ(sc, ATW_LPC);
+	(void)ATW_READ(sc, ATW_LPC);
 
 	DPRINTF(sc, ("%s: ATW_LPC %#08x\n", __func__, lpc));
 
@@ -2474,10 +2473,8 @@ atw_newstate(struct ieee80211com *ic, enum ieee80211_state nstate, int arg)
 {
 	struct ifnet *ifp = ic->ic_ifp;
 	struct atw_softc *sc = ifp->if_softc;
-	enum ieee80211_state ostate;
 	int error = 0;
 
-	ostate = ic->ic_state;
 	callout_stop(&sc->sc_scan_ch);
 
 	switch (nstate) {
@@ -3452,7 +3449,7 @@ atw_start(struct ifnet *ifp)
 	struct atw_frame *hh;
 	uint16_t hdrctl;
 	struct mbuf *m0, *m;
-	struct atw_txsoft *txs, *last_txs;
+	struct atw_txsoft *txs;
 	struct atw_txdesc *txd;
 	int npkt, rate;
 	bus_dmamap_t dmamap;
@@ -3805,8 +3802,6 @@ atw_start(struct ifnet *ifp)
 
 		SIMPLEQ_REMOVE_HEAD(&sc->sc_txfreeq, txs_q);
 		SIMPLEQ_INSERT_TAIL(&sc->sc_txdirtyq, txs, txs_q);
-
-		last_txs = txs;
 	}
 
 	if (sc->sc_txfree != ofree) {
diff --git a/sys/dev/ic/bwi.c b/sys/dev/ic/bwi.c
index d9a751e8472c..634c5d38caf2 100644
--- a/sys/dev/ic/bwi.c
+++ b/sys/dev/ic/bwi.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: bwi.c,v 1.22 2012/04/25 05:14:05 nakayama Exp $	*/
+/*	$NetBSD: bwi.c,v 1.23 2013/10/17 21:24:24 christos Exp $	*/
 /*	$OpenBSD: bwi.c,v 1.74 2008/02/25 21:13:30 mglocker Exp $	*/
 
 /*
@@ -48,7 +48,7 @@
 
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: bwi.c,v 1.22 2012/04/25 05:14:05 nakayama Exp $");
+__KERNEL_RCSID(0, "$NetBSD: bwi.c,v 1.23 2013/10/17 21:24:24 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/callout.h>
@@ -5320,7 +5320,7 @@ bwi_rf_calc_nrssi_slope_11b(struct bwi_mac *mac)
 	struct bwi_phy *phy = &mac->mac_phy;
 	uint16_t save_rf[SAVE_RF_MAX];
 	uint16_t save_phy[SAVE_PHY_MAX];
-	uint16_t ant_div, bbp_atten, chan_ex;
+	uint16_t ant_div, chan_ex;
 	int16_t nrssi[2];
 	int i;
 
@@ -5333,7 +5333,7 @@ bwi_rf_calc_nrssi_slope_11b(struct bwi_mac *mac)
 		save_phy[i] = PHY_READ(mac, save_phy_regs[i]);
 
 	ant_div = CSR_READ_2(sc, BWI_RF_ANTDIV);
-	bbp_atten = CSR_READ_2(sc, BWI_BBP_ATTEN);
+	(void)CSR_READ_2(sc, BWI_BBP_ATTEN);
 	chan_ex = CSR_READ_2(sc, BWI_RF_CHAN_EX);
 
 	/*
@@ -9338,13 +9338,13 @@ bwi_txeof(struct bwi_softc *sc)
 	struct ifnet *ifp = &sc->sc_if;
 
 	for (;;) {
-		uint32_t tx_status0, tx_status1;
+		uint32_t tx_status0;
 		uint16_t tx_id, tx_info;
 
 		tx_status0 = CSR_READ_4(sc, BWI_TXSTATUS_0);
 		if ((tx_status0 & BWI_TXSTATUS_0_MORE) == 0)
 			break;
-		tx_status1 = CSR_READ_4(sc, BWI_TXSTATUS_1);
+		(void)CSR_READ_4(sc, BWI_TXSTATUS_1);
 
 		tx_id = __SHIFTOUT(tx_status0, BWI_TXSTATUS_0_TXID_MASK);
 		tx_info = BWI_TXSTATUS_0_INFO(tx_status0);
diff --git a/sys/dev/ic/ciss.c b/sys/dev/ic/ciss.c
index 0d69d7f3635c..1ed754ffea20 100644
--- a/sys/dev/ic/ciss.c
+++ b/sys/dev/ic/ciss.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ciss.c,v 1.31 2013/10/13 04:24:21 christos Exp $	*/
+/*	$NetBSD: ciss.c,v 1.32 2013/10/17 21:24:24 christos Exp $	*/
 /*	$OpenBSD: ciss.c,v 1.68 2013/05/30 16:15:02 deraadt Exp $	*/
 
 /*
@@ -19,7 +19,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ciss.c,v 1.31 2013/10/13 04:24:21 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ciss.c,v 1.32 2013/10/17 21:24:24 christos Exp $");
 
 #include "bio.h"
 
@@ -1067,7 +1067,6 @@ ciss_scsi_cmd(struct scsipi_channel *chan, scsipi_adapter_req_t req,
 	u_int8_t target;
 	struct ciss_ccb *ccb;
 	struct ciss_cmd *cmd;
-	int error;
 
 	CISS_DPRINTF(CISS_D_CMD, ("ciss_scsi_cmd "));
 
@@ -1087,7 +1086,6 @@ ciss_scsi_cmd(struct scsipi_channel *chan, scsipi_adapter_req_t req,
 			break;
 		}
 
-		error = 0;
 		xs->error = XS_NOERROR;
 
 		/* XXX emulate SYNCHRONIZE_CACHE ??? */
diff --git a/sys/dev/ic/mfi.c b/sys/dev/ic/mfi.c
index 3673d26ad1a1..8bf8819fc59d 100644
--- a/sys/dev/ic/mfi.c
+++ b/sys/dev/ic/mfi.c
@@ -1,4 +1,4 @@
-/* $NetBSD: mfi.c,v 1.49 2013/06/28 14:46:44 christos Exp $ */
+/* $NetBSD: mfi.c,v 1.50 2013/10/17 21:24:24 christos Exp $ */
 /* $OpenBSD: mfi.c,v 1.66 2006/11/28 23:59:45 dlg Exp $ */
 
 /*
@@ -73,7 +73,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: mfi.c,v 1.49 2013/06/28 14:46:44 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: mfi.c,v 1.50 2013/10/17 21:24:24 christos Exp $");
 
 #include "bio.h"
 
@@ -2340,7 +2340,6 @@ mfi_ioctl_setstate(struct mfi_softc *sc, struct bioc_setstate *bs)
 	struct mfi_pd_list	*pd;
 	int			i, found, rv = EINVAL;
 	uint8_t			mbox[MFI_MBOX_SIZE];
-	uint32_t		cmd;
 
 	DNPRINTF(MFI_D_IOCTL, "%s: mfi_ioctl_setstate %x\n", DEVNAME(sc),
 	    bs->bs_status);
@@ -2368,21 +2367,17 @@ mfi_ioctl_setstate(struct mfi_softc *sc, struct bioc_setstate *bs)
 	switch (bs->bs_status) {
 	case BIOC_SSONLINE:
 		mbox[2] = MFI_PD_ONLINE;
-		cmd = MD_DCMD_PD_SET_STATE;
 		break;
 
 	case BIOC_SSOFFLINE:
 		mbox[2] = MFI_PD_OFFLINE;
-		cmd = MD_DCMD_PD_SET_STATE;
 		break;
 
 	case BIOC_SSHOTSPARE:
 		mbox[2] = MFI_PD_HOTSPARE;
-		cmd = MD_DCMD_PD_SET_STATE;
 		break;
 /*
 	case BIOC_SSREBUILD:
-		cmd = MD_DCMD_PD_REBUILD;
 		break;
 */
 	default:
@@ -3501,9 +3496,6 @@ mfifopen(dev_t dev, int flag, int mode, struct lwp *l)
 static int
 mfifclose(dev_t dev, int flag, int mode, struct lwp *l)
 {
-	struct mfi_softc *sc;
-
-	sc = device_lookup_private(&mfi_cd, minor(dev));
 	return (0);
 }
 
diff --git a/sys/dev/ic/mtd803.c b/sys/dev/ic/mtd803.c
index d7f2e750af31..267198ac7a58 100644
--- a/sys/dev/ic/mtd803.c
+++ b/sys/dev/ic/mtd803.c
@@ -1,4 +1,4 @@
-/* $NetBSD: mtd803.c,v 1.27 2012/10/27 17:18:22 chs Exp $ */
+/* $NetBSD: mtd803.c,v 1.28 2013/10/17 21:24:24 christos Exp $ */
 
 /*-
  *
@@ -44,7 +44,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: mtd803.c,v 1.27 2012/10/27 17:18:22 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: mtd803.c,v 1.28 2013/10/17 21:24:24 christos Exp $");
 
 
 #include <sys/param.h>
@@ -460,7 +460,6 @@ mtd_start(struct ifnet *ifp)
 {
 	struct mtd_softc *sc = ifp->if_softc;
 	struct mbuf *m;
-	int len;
 	int first_tx = sc->cur_tx;
 
 	/* Don't transmit when the interface is busy or inactive */
@@ -476,7 +475,7 @@ mtd_start(struct ifnet *ifp)
 		bpf_mtap(ifp, m);
 
 		/* Copy mbuf chain into tx buffer */
-		len = mtd_put(sc, sc->cur_tx, m);
+		(void)mtd_put(sc, sc->cur_tx, m);
 
 		if (sc->cur_tx != first_tx)
 			sc->desc[MTD_NUM_RXD + sc->cur_tx].stat = MTD_TXD_OWNER;
diff --git a/sys/dev/ic/rtw.c b/sys/dev/ic/rtw.c
index 9ebe8a77f49c..9844dc41f514 100644
--- a/sys/dev/ic/rtw.c
+++ b/sys/dev/ic/rtw.c
@@ -1,4 +1,4 @@
-/* $NetBSD: rtw.c,v 1.119 2011/07/04 16:06:17 joerg Exp $ */
+/* $NetBSD: rtw.c,v 1.120 2013/10/17 21:24:24 christos Exp $ */
 /*-
  * Copyright (c) 2004, 2005, 2006, 2007 David Young.  All rights
  * reserved.
@@ -32,7 +32,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rtw.c,v 1.119 2011/07/04 16:06:17 joerg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rtw.c,v 1.120 2013/10/17 21:24:24 christos Exp $");
 
 
 #include <sys/param.h>
@@ -830,7 +830,6 @@ rtw_srom_parse(struct rtw_srom *sr, uint32_t *flags, uint8_t *cs_threshold,
 	const char *rfname, *paname;
 	char scratch[sizeof("unknown 0xXX")];
 	uint16_t srom_version;
-	uint8_t mac[IEEE80211_ADDR_LEN];
 
 	*flags &= ~(RTW_F_DIGPHY|RTW_F_DFLANTB|RTW_F_ANTDIV);
 	*rcr &= ~(RTW_RCR_ENCS1 | RTW_RCR_ENCS2);
@@ -849,8 +848,10 @@ rtw_srom_parse(struct rtw_srom *sr, uint32_t *flags, uint8_t *cs_threshold,
 		    srom_version >> 8, srom_version & 0xff);
 	}
 
+	uint8_t mac[IEEE80211_ADDR_LEN];
 	for (i = 0; i < IEEE80211_ADDR_LEN; i++)
 		mac[i] = RTW_SR_GET(sr, RTW_SR_MAC + i);
+	__USE(mac);
 
 	RTW_DPRINTF(RTW_DEBUG_ATTACH,
 	    ("%s: EEPROM MAC %s\n", device_xname(dev), ether_sprintf(mac)));
@@ -1054,9 +1055,13 @@ rtw_set_rfprog(struct rtw_regs *regs, enum rtw_rfchipid rfchipid,
 
 	RTW_WBR(regs, RTW_CONFIG4, RTW_CONFIG4);
 
+#ifdef RTW_DEBUG
 	RTW_DPRINTF(RTW_DEBUG_INIT,
 	    ("%s: %s RF programming method, %#02x\n", device_xname(dev), method,
 	    RTW_READ8(regs, RTW_CONFIG4)));
+#else
+	__USE(method);
+#endif
 }
 
 static inline void
@@ -1375,12 +1380,17 @@ rtw_rxdesc_init(struct rtw_rxdesc_blk *rdb, struct rtw_rxsoft *rs,
 	octl = rd->rd_ctl;
 	rd->rd_ctl = htole32(ctl);
 
+#ifdef RTW_DEBUG
 	RTW_DPRINTF(
 	    kick ? (RTW_DEBUG_RECV_DESC | RTW_DEBUG_IO_KICK)
 	         : RTW_DEBUG_RECV_DESC,
 	    ("%s: rd %p buf %08x -> %08x ctl %08x -> %08x\n", __func__, rd,
 	     le32toh(obuf), le32toh(rd->rd_buf), le32toh(octl),
 	     le32toh(rd->rd_ctl)));
+#else
+	__USE(octl);
+	__USE(obuf);
+#endif
 
 	/* sync the descriptor */
 	bus_dmamap_sync(rdb->rdb_dmat, rdb->rdb_dmamap,
@@ -1392,11 +1402,9 @@ static void
 rtw_rxdesc_init_all(struct rtw_rxdesc_blk *rdb, struct rtw_rxsoft *ctl, int kick)
 {
 	int i;
-	struct rtw_rxdesc *rd;
 	struct rtw_rxsoft *rs;
 
 	for (i = 0; i < rdb->rdb_ndesc; i++) {
-		rd = &rdb->rdb_desc[i];
 		rs = &ctl[i];
 		rtw_rxdesc_init(rdb, rs, i, kick);
 	}
@@ -1730,10 +1738,14 @@ rtw_collect_txpkt(struct rtw_softc *sc, struct rtw_txdesc_blk *tdb,
 		condstring = "error";
 	}
 
+#ifdef RTW_DEBUG
 	DPRINTF(sc, RTW_DEBUG_XMIT_DESC,
 	    ("%s: ts %p txdesc[%d, %d] %s tries rts %u data %u\n",
 	    device_xname(sc->sc_dev), ts, ts->ts_first, ts->ts_last,
 	    condstring, rts_retry, data_retry));
+#else
+	__USE(condstring);
+#endif
 }
 
 static void
@@ -1864,11 +1876,17 @@ rtw_intr_beacon(struct rtw_softc *sc, uint16_t isr)
 
 	if ((isr & (RTW_INTR_TBDOK|RTW_INTR_TBDER)) != 0) {
 		next = rtw_txring_next(&sc->sc_regs, tdb);
+#ifdef RTW_DEBUG
 		RTW_DPRINTF(RTW_DEBUG_BEACON,
 		    ("%s: beacon ring %sprocessed, isr = %#04" PRIx16
 		     ", next %u expected %u, %" PRIu64 "\n", __func__,
 		     (next == tdb->tdb_next) ? "" : "un", isr, next,
 		     tdb->tdb_next, (uint64_t)tsfth << 32 | tsftl));
+#else
+		__USE(next);
+		__USE(tsfth);
+		__USE(tsftl);
+#endif
 		if ((RTW_READ8(&sc->sc_regs, RTW_TPPOLL) & RTW_TPPOLL_BQ) == 0)
 			rtw_collect_txring(sc, tsb, tdb, 1);
 	}
@@ -2104,9 +2122,13 @@ rtw_resume_ticks(struct rtw_softc *sc)
 
 	sc->sc_do_tick = 1;
 
+#ifdef RTW_DEBUG
 	RTW_DPRINTF(RTW_DEBUG_TIMEOUT,
 	    ("%s: resume ticks delta %#08x now %#08x next %#08x\n",
 	    device_xname(sc->sc_dev), tsftrl1 - tsftrl0, tsftrl1, next_tint));
+#else
+	__USE(tsftrl0);
+#endif
 }
 
 static void
diff --git a/sys/dev/ic/sl811hs.c b/sys/dev/ic/sl811hs.c
index 4e967a60ebfd..12f2de58129f 100644
--- a/sys/dev/ic/sl811hs.c
+++ b/sys/dev/ic/sl811hs.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: sl811hs.c,v 1.46 2013/10/04 21:10:18 joerg Exp $	*/
+/*	$NetBSD: sl811hs.c,v 1.47 2013/10/17 21:24:24 christos Exp $	*/
 
 /*
  * Not (c) 2007 Matthew Orgass
@@ -68,7 +68,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sl811hs.c,v 1.46 2013/10/04 21:10:18 joerg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sl811hs.c,v 1.47 2013/10/17 21:24:24 christos Exp $");
 
 #include "opt_slhci.h"
 
@@ -1365,11 +1365,9 @@ slhci_close(struct usbd_pipe *pipe)
 {
 	struct slhci_softc *sc;
 	struct slhci_pipe *spipe;
-	struct slhci_transfers *t;
 
 	sc = pipe->device->bus->hci_private;
 	spipe = (struct slhci_pipe *)pipe;
-	t = &sc->sc_transfers;
 
 	DLOG(D_TRACE, "%s close spipe %p spipe->xfer %p",
 	    pnames(spipe->ptype), spipe, spipe->xfer, 0);
@@ -1597,7 +1595,7 @@ waitcheck:
 #define BSB(a, b, c, d, e) bus_space_barrier(a, b, c, d, BUS_SPACE_BARRIER_ # e)
 #define BSB_SYNC(a, b, c, d) bus_space_barrier(a, b, c, d, BUS_SPACE_BARRIER_SYNC)
 #else /* now !SLHCI_BUS_SPACE_BARRIERS */
-#define BSB(a, b, c, d, e)
+#define BSB(a, b, c, d, e) __USE(d)
 #define BSB_SYNC(a, b, c, d)
 #endif /* SLHCI_BUS_SPACE_BARRIERS */
 
@@ -2621,10 +2619,8 @@ static usbd_status
 slhci_close_pipe(struct slhci_softc *sc, struct slhci_pipe *spipe, struct
     usbd_xfer *xfer)
 {
-	struct slhci_transfers *t;
 	struct usbd_pipe *pipe;
 
-	t = &sc->sc_transfers;
 	pipe = &spipe->pipe;
 
 	if (pipe->interval && spipe->ptype != PT_ROOT_INTR)
diff --git a/sys/dev/ic/spic.c b/sys/dev/ic/spic.c
index 2f911a887274..68e3a9f3f1d4 100644
--- a/sys/dev/ic/spic.c
+++ b/sys/dev/ic/spic.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: spic.c,v 1.18 2010/04/21 21:49:53 dyoung Exp $	*/
+/*	$NetBSD: spic.c,v 1.19 2013/10/17 21:24:24 christos Exp $	*/
 
 /*
  * Copyright (c) 2002 The NetBSD Foundation, Inc.
@@ -49,7 +49,7 @@
 
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: spic.c,v 1.18 2010/04/21 21:49:53 dyoung Exp $");
+__KERNEL_RCSID(0, "$NetBSD: spic.c,v 1.19 2013/10/17 21:24:24 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -113,11 +113,11 @@ static const struct wsmouse_accessops spic_accessops = {
 static u_int8_t
 spic_call1(struct spic_softc *sc, u_int8_t dev)
 {
-	u_int8_t v1, v2;
+	u_int8_t v2;
 
 	SPIC_COMMAND(0, INB(sc, SPIC_PORT2) & 2);
 	OUTB(sc, dev, SPIC_PORT2);
-	v1 = INB(sc, SPIC_PORT2);
+	(void)INB(sc, SPIC_PORT2);
 	v2 = INB(sc, SPIC_PORT1);
 	return v2;
 }
diff --git a/sys/dev/ic/tpm.c b/sys/dev/ic/tpm.c
index e15f174c8fab..d8fea740e272 100644
--- a/sys/dev/ic/tpm.c
+++ b/sys/dev/ic/tpm.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: tpm.c,v 1.8 2013/09/14 13:09:55 joerg Exp $	*/
+/*	$NetBSD: tpm.c,v 1.9 2013/10/17 21:24:24 christos Exp $	*/
 /*
  * Copyright (c) 2008, 2009 Michael Shalayeff
  * Copyright (c) 2009, 2010 Hans-Jörg Höxer
@@ -18,7 +18,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tpm.c,v 1.8 2013/09/14 13:09:55 joerg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tpm.c,v 1.9 2013/10/17 21:24:24 christos Exp $");
 
 #if 0
 #define	TPM_DEBUG 
@@ -855,7 +855,6 @@ int
 tpm_legacy_init(struct tpm_softc *sc, int irq, const char *name)
 {
 	char id[8];
-	uint8_t ioh, iol;
 	int i;
 
 	if ((i = bus_space_map(sc->sc_batm, tpm_enabled, 2, 0, &sc->sc_bahm))) {
@@ -870,8 +869,6 @@ tpm_legacy_init(struct tpm_softc *sc, int irq, const char *name)
 
 	aprint_debug_dev(sc->sc_dev, "%.4s %d.%d @0x%x\n", &id[4], id[0],
 	    id[1], tpm_enabled);
-	iol = tpm_enabled & 0xff;
-	ioh = tpm_enabled >> 16;
 	tpm_enabled = 0;
 
 	return 0;