diff --git a/sys/compat/ndis/kern_ndis.c b/sys/compat/ndis/kern_ndis.c
index 0dfcb53e32e2..f45f31455271 100644
--- a/sys/compat/ndis/kern_ndis.c
+++ b/sys/compat/ndis/kern_ndis.c
@@ -838,8 +838,6 @@ ndis_set_info(arg, oid, buf, buflen)
 
 	sc = arg;
 
-	mtx_lock(&ndis_req_mtx);
-
 	KeAcquireSpinLock(&sc->ndis_block->nmb_lock, &irql);
 
 	if (sc->ndis_block->nmb_pendingreq != NULL)
@@ -847,16 +845,20 @@ ndis_set_info(arg, oid, buf, buflen)
 	else
 		sc->ndis_block->nmb_pendingreq = (ndis_request *)sc;
 
+	NDIS_LOCK(sc);
 	setfunc = sc->ndis_chars->nmc_setinfo_func;
 	adapter = sc->ndis_block->nmb_miniportadapterctx;
 
-	if (adapter == NULL || setfunc == NULL) {
+	if (adapter == NULL || setfunc == NULL ||
+	    sc->ndis_block->nmb_devicectx == NULL) {
 		sc->ndis_block->nmb_pendingreq = NULL;
+		NDIS_UNLOCK(sc);
 		KeReleaseSpinLock(&sc->ndis_block->nmb_lock, irql);
-		mtx_unlock(&ndis_req_mtx);
 		return(ENXIO);
 	}
 
+	NDIS_UNLOCK(sc);
+
 	rval = MSCALL6(setfunc, adapter, oid, buf, *buflen,
 	    &byteswritten, &bytesneeded);
 
@@ -865,13 +867,13 @@ ndis_set_info(arg, oid, buf, buflen)
 	KeReleaseSpinLock(&sc->ndis_block->nmb_lock, irql);
 
 	if (rval == NDIS_STATUS_PENDING) {
+		mtx_lock(&ndis_req_mtx);
 		error = msleep(&sc->ndis_block->nmb_setstat,
 		    &ndis_req_mtx,
 		    curthread->td_priority|PDROP,
 		    "ndisset", 5 * hz);
 		rval = sc->ndis_block->nmb_setstat;
-	} else
-		mtx_unlock(&ndis_req_mtx);
+	}
 
 
 	if (byteswritten)
@@ -1044,20 +1046,22 @@ ndis_reset_nic(arg)
 	ndis_handle		adapter;
 	ndis_reset_handler	resetfunc;
 	uint8_t			addressing_reset;
-	struct ifnet		*ifp;
 	int			rval;
 	uint8_t			irql;
 
 	sc = arg;
-	ifp = &sc->arpcom.ac_if;
 
+	NDIS_LOCK(sc);
 	adapter = sc->ndis_block->nmb_miniportadapterctx;
 	resetfunc = sc->ndis_chars->nmc_reset_func;
 
-	if (adapter == NULL || resetfunc == NULL)
+	if (adapter == NULL || resetfunc == NULL ||
+	    sc->ndis_block->nmb_devicectx == NULL) {
+		NDIS_UNLOCK(sc);
 		return(EIO);
+	}
 
-	mtx_lock(&ndis_req_mtx);
+	NDIS_UNLOCK(sc);
 
 	if (NDIS_SERIALIZED(sc->ndis_block))
 		KeAcquireSpinLock(&sc->ndis_block->nmb_lock, &irql);
@@ -1068,10 +1072,10 @@ ndis_reset_nic(arg)
 		KeReleaseSpinLock(&sc->ndis_block->nmb_lock, irql);
 
 	if (rval == NDIS_STATUS_PENDING) {
+		mtx_lock(&ndis_req_mtx);
 		msleep(sc, &ndis_req_mtx,
 		    curthread->td_priority|PDROP, "ndisrst", 0);
-	} else
-		mtx_unlock(&ndis_req_mtx);
+	}
 
 	return(0);
 }
@@ -1085,14 +1089,11 @@ ndis_halt_nic(arg)
 	struct ndis_softc	*sc;
 	ndis_handle		adapter;
 	ndis_halt_handler	haltfunc;
-	struct ifnet		*ifp;
 #ifdef NDIS_REAP_TIMERS
 	ndis_miniport_timer	*t, *n;
-	uint8_t			irql;
 #endif
 
 	sc = arg;
-	ifp = &sc->arpcom.ac_if;
 
 	NDIS_LOCK(sc);
 	adapter = sc->ndis_block->nmb_miniportadapterctx;
@@ -1101,6 +1102,8 @@ ndis_halt_nic(arg)
 		return(EIO);
 	}
 
+	sc->ndis_block->nmb_devicectx = NULL;
+
 #ifdef NDIS_REAP_TIMERS
 	/*
 	 * Drivers are sometimes very lax about cancelling all
@@ -1110,7 +1113,6 @@ ndis_halt_nic(arg)
 	 * the timers reside will no longer be valid.
 	 */
 
-	KeAcquireSpinLock(&sc->ndis_block->nmb_lock, &irql);
 	t = sc->ndis_block->nmb_timerlist;
 	while (t != NULL) {
 		KeCancelTimer(&t->nmt_ktimer);
@@ -1119,7 +1121,6 @@ ndis_halt_nic(arg)
 		n->nmt_nexttimer = NULL;
 	}
 	sc->ndis_block->nmb_timerlist = NULL;
-	KeReleaseSpinLock(&sc->ndis_block->nmb_lock, irql);
 	KeFlushQueuedDpcs();
 #endif
 
@@ -1132,9 +1133,7 @@ ndis_halt_nic(arg)
 	haltfunc = sc->ndis_chars->nmc_halt_func;
 	NDIS_UNLOCK(sc);
 
-	mtx_lock(&ndis_req_mtx);
 	MSCALL1(haltfunc, adapter);
-	mtx_unlock(&ndis_req_mtx);
 
 	NDIS_LOCK(sc);
 	sc->ndis_block->nmb_miniportadapterctx = NULL;
@@ -1194,10 +1193,8 @@ ndis_init_nic(arg)
 	for (i = 0; i < NdisMediumMax; i++)
 		mediumarray[i] = i;
 
-	mtx_lock(&ndis_req_mtx);
         status = MSCALL6(initfunc, &openstatus, &chosenmedium,
             mediumarray, NdisMediumMax, block, block);
-	mtx_unlock(&ndis_req_mtx);
 
 	/*
 	 * If the init fails, blow away the other exported routines
@@ -1223,6 +1220,10 @@ ndis_init_nic(arg)
 
 	ndis_thsuspend(curthread->td_proc, NULL, hz);
 
+	NDIS_LOCK(sc);
+	sc->ndis_block->nmb_devicectx = sc;
+	NDIS_UNLOCK(sc);
+
 	return(0);
 }
 
@@ -1340,7 +1341,7 @@ ndis_get_info(arg, oid, buf, buflen)
 	uint8_t			irql;
 
 	sc = arg;
-	mtx_lock(&ndis_req_mtx);
+
 	KeAcquireSpinLock(&sc->ndis_block->nmb_lock, &irql);
 
 	if (sc->ndis_block->nmb_pendingreq != NULL)
@@ -1348,16 +1349,20 @@ ndis_get_info(arg, oid, buf, buflen)
 	else
 		sc->ndis_block->nmb_pendingreq = (ndis_request *)sc;
 
+	NDIS_LOCK(sc);
 	queryfunc = sc->ndis_chars->nmc_queryinfo_func;
 	adapter = sc->ndis_block->nmb_miniportadapterctx;
 
-	if (adapter == NULL || queryfunc == NULL) {
+	if (adapter == NULL || queryfunc == NULL ||
+	    sc->ndis_block->nmb_devicectx == NULL) {
 		sc->ndis_block->nmb_pendingreq = NULL;
+		NDIS_UNLOCK(sc);
 		KeReleaseSpinLock(&sc->ndis_block->nmb_lock, irql);
-		mtx_unlock(&ndis_req_mtx);
 		return(ENXIO);
 	}
 
+	NDIS_UNLOCK(sc);
+
 	rval = MSCALL6(queryfunc, adapter, oid, buf, *buflen,
 	    &byteswritten, &bytesneeded);
 
@@ -1368,13 +1373,13 @@ ndis_get_info(arg, oid, buf, buflen)
 	/* Wait for requests that block. */
 
 	if (rval == NDIS_STATUS_PENDING) {
+		mtx_lock(&ndis_req_mtx);
 		error = msleep(&sc->ndis_block->nmb_getstat,
 		    &ndis_req_mtx,
 		    curthread->td_priority|PDROP,
 		    "ndisget", 5 * hz);
 		rval = sc->ndis_block->nmb_getstat;
-	} else
-		mtx_unlock(&ndis_req_mtx);
+	}
 
 	if (byteswritten)
 		*buflen = byteswritten;
diff --git a/sys/compat/ndis/ndis_var.h b/sys/compat/ndis/ndis_var.h
index 22e614e8e824..6e81b9961e42 100644
--- a/sys/compat/ndis/ndis_var.h
+++ b/sys/compat/ndis/ndis_var.h
@@ -1476,19 +1476,12 @@ struct ndis_miniport_block {
 	 * End of windows-specific portion of miniport block. Everything
 	 * below is BSD-specific.
 	 */
-	struct ifnet		*nmb_ifp;
 	uint8_t			nmb_dummybuf[128];
-	device_object		nmb_devobj;
 	ndis_config_parm	nmb_replyparm;
-	int			nmb_pciidx;
-	device_t		nmb_dev;
 	ndis_resource_list	*nmb_rlist;
 	ndis_status		nmb_getstat;
 	ndis_status		nmb_setstat;
-	vm_offset_t		nmb_img;
 	ndis_miniport_timer	*nmb_timerlist;
-	io_workitem		*nmb_workitems[NUMBER_OF_SINGLE_WORK_ITEMS];
-	int			nmb_item_idx;
 	TAILQ_ENTRY(ndis_miniport_block)	link;
 };
 
diff --git a/sys/compat/ndis/subr_ntoskrnl.c b/sys/compat/ndis/subr_ntoskrnl.c
index e2e3838f0f0a..f7194c0a759f 100644
--- a/sys/compat/ndis/subr_ntoskrnl.c
+++ b/sys/compat/ndis/subr_ntoskrnl.c
@@ -3108,9 +3108,8 @@ KeFlushQueuedDpcs(void)
 	 * for them to drain.
 	 */
 
-	kq = kq_queues;
 	for (i = 0; i < mp_ncpus; i++) {
-		kq += i;
+		kq = kq_queues + i;
 		KeSetEvent(&kq->kq_proc, 0, FALSE);
 		KeWaitForSingleObject((nt_dispatch_header *)&kq->kq_done,
 		    0, 0, TRUE, NULL);
diff --git a/sys/dev/if_ndis/if_ndis.c b/sys/dev/if_ndis/if_ndis.c
index 072146cbba5e..e09250ddc4d1 100644
--- a/sys/dev/if_ndis/if_ndis.c
+++ b/sys/dev/if_ndis/if_ndis.c
@@ -2768,14 +2768,14 @@ ndis_stop(sc)
 	ifp = &sc->arpcom.ac_if;
 	untimeout(ndis_tick, sc, sc->ndis_stat_ch);
 
-	ndis_halt_nic(sc);
-
 	NDIS_LOCK(sc);
 	ifp->if_timer = 0;
 	sc->ndis_link = 0;
 	ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
 	NDIS_UNLOCK(sc);
 
+	ndis_halt_nic(sc);
+
 	return;
 }