diff --git a/drivers/isdn/hardware/avm/avm_cs.c b/drivers/isdn/hardware/avm/avm_cs.c
index db9bad2..27391c3 100644
--- a/drivers/isdn/hardware/avm/avm_cs.c
+++ b/drivers/isdn/hardware/avm/avm_cs.c
@@ -212,11 +212,8 @@
     
     /* Unlink device structure, free pieces */
     *linkp = link->next;
-    if (link->priv) {
-	kfree(link->priv);
-    }
+    kfree(link->priv);
     kfree(link);
-    
 } /* avmcs_detach */
 
 /*======================================================================
diff --git a/drivers/isdn/hisax/avm_pci.c b/drivers/isdn/hisax/avm_pci.c
index 625799a..5d8ee73 100644
--- a/drivers/isdn/hisax/avm_pci.c
+++ b/drivers/isdn/hisax/avm_pci.c
@@ -552,14 +552,10 @@
 {
 	modehdlc(bcs, 0, 0);
 	if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
-		if (bcs->hw.hdlc.rcvbuf) {
-			kfree(bcs->hw.hdlc.rcvbuf);
-			bcs->hw.hdlc.rcvbuf = NULL;
-		}
-		if (bcs->blog) {
-			kfree(bcs->blog);
-			bcs->blog = NULL;
-		}
+		kfree(bcs->hw.hdlc.rcvbuf);
+		bcs->hw.hdlc.rcvbuf = NULL;
+		kfree(bcs->blog);
+		bcs->blog = NULL;
 		skb_queue_purge(&bcs->rqueue);
 		skb_queue_purge(&bcs->squeue);
 		if (bcs->tx_skb) {
diff --git a/drivers/isdn/hisax/avma1_cs.c b/drivers/isdn/hisax/avma1_cs.c
index 0e22991..5f5a5ae7 100644
--- a/drivers/isdn/hisax/avma1_cs.c
+++ b/drivers/isdn/hisax/avma1_cs.c
@@ -236,9 +236,7 @@
     
     /* Unlink device structure, free pieces */
     *linkp = link->next;
-    if (link->priv) {
-	kfree(link->priv);
-    }
+    kfree(link->priv);
     kfree(link);
     
 } /* avma1cs_detach */
diff --git a/drivers/isdn/hisax/config.c b/drivers/isdn/hisax/config.c
index fbaab43..8159bce 100644
--- a/drivers/isdn/hisax/config.c
+++ b/drivers/isdn/hisax/config.c
@@ -787,8 +787,7 @@
 	ic.command = ISDN_STAT_UNLOAD;
 	ic.driver = cs->myid;
 	cs->iif.statcallb(&ic);
-	if (cs->status_buf)
-		kfree(cs->status_buf);
+	kfree(cs->status_buf);
 	cs->status_read = NULL;
 	cs->status_write = NULL;
 	cs->status_end = NULL;
@@ -807,10 +806,8 @@
 
 	skb_queue_purge(&csta->rq);
 	skb_queue_purge(&csta->sq);
-	if (csta->rcvbuf) {
-		kfree(csta->rcvbuf);
-		csta->rcvbuf = NULL;
-	}
+	kfree(csta->rcvbuf);
+	csta->rcvbuf = NULL;
 	if (csta->tx_skb) {
 		dev_kfree_skb(csta->tx_skb);
 		csta->tx_skb = NULL;
diff --git a/drivers/isdn/hisax/hfc_2bds0.c b/drivers/isdn/hisax/hfc_2bds0.c
index 7cf8779..637a261 100644
--- a/drivers/isdn/hisax/hfc_2bds0.c
+++ b/drivers/isdn/hisax/hfc_2bds0.c
@@ -1052,18 +1052,12 @@
 void
 release2bds0(struct IsdnCardState *cs)
 {
-	if (cs->bcs[0].hw.hfc.send) {
-		kfree(cs->bcs[0].hw.hfc.send);
-		cs->bcs[0].hw.hfc.send = NULL;
-	}
-	if (cs->bcs[1].hw.hfc.send) {
-		kfree(cs->bcs[1].hw.hfc.send);
-		cs->bcs[1].hw.hfc.send = NULL;
-	}
-	if (cs->hw.hfcD.send) {
-		kfree(cs->hw.hfcD.send);
-		cs->hw.hfcD.send = NULL;
-	}
+	kfree(cs->bcs[0].hw.hfc.send);
+	cs->bcs[0].hw.hfc.send = NULL;
+	kfree(cs->bcs[1].hw.hfc.send);
+	cs->bcs[1].hw.hfc.send = NULL;
+	kfree(cs->hw.hfcD.send);
+	cs->hw.hfcD.send = NULL;
 }
 
 void
diff --git a/drivers/isdn/hisax/hfc_2bs0.c b/drivers/isdn/hisax/hfc_2bs0.c
index f978a5a..c964539 100644
--- a/drivers/isdn/hisax/hfc_2bs0.c
+++ b/drivers/isdn/hisax/hfc_2bs0.c
@@ -582,12 +582,8 @@
 void
 releasehfc(struct IsdnCardState *cs)
 {
-	if (cs->bcs[0].hw.hfc.send) {
-		kfree(cs->bcs[0].hw.hfc.send);
-		cs->bcs[0].hw.hfc.send = NULL;
-	}
-	if (cs->bcs[1].hw.hfc.send) {
-		kfree(cs->bcs[1].hw.hfc.send);
-		cs->bcs[1].hw.hfc.send = NULL;
-	}
+	kfree(cs->bcs[0].hw.hfc.send);
+	cs->bcs[0].hw.hfc.send = NULL;
+	kfree(cs->bcs[1].hw.hfc.send);
+	cs->bcs[1].hw.hfc.send = NULL;
 }
diff --git a/drivers/isdn/hisax/hscx.c b/drivers/isdn/hisax/hscx.c
index 66dbaee..c8f9951 100644
--- a/drivers/isdn/hisax/hscx.c
+++ b/drivers/isdn/hisax/hscx.c
@@ -156,14 +156,10 @@
 {
 	modehscx(bcs, 0, bcs->channel);
 	if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
-		if (bcs->hw.hscx.rcvbuf) {
-			kfree(bcs->hw.hscx.rcvbuf);
-			bcs->hw.hscx.rcvbuf = NULL;
-		}
-		if (bcs->blog) {
-			kfree(bcs->blog);
-			bcs->blog = NULL;
-		}
+		kfree(bcs->hw.hscx.rcvbuf);
+		bcs->hw.hscx.rcvbuf = NULL;
+		kfree(bcs->blog);
+		bcs->blog = NULL;
 		skb_queue_purge(&bcs->rqueue);
 		skb_queue_purge(&bcs->squeue);
 		if (bcs->tx_skb) {
diff --git a/drivers/isdn/hisax/icc.c b/drivers/isdn/hisax/icc.c
index b4ca585..c615752 100644
--- a/drivers/isdn/hisax/icc.c
+++ b/drivers/isdn/hisax/icc.c
@@ -571,14 +571,10 @@
 
 static void
 DC_Close_icc(struct IsdnCardState *cs) {
-	if (cs->dc.icc.mon_rx) {
-		kfree(cs->dc.icc.mon_rx);
-		cs->dc.icc.mon_rx = NULL;
-	}
-	if (cs->dc.icc.mon_tx) {
-		kfree(cs->dc.icc.mon_tx);
-		cs->dc.icc.mon_tx = NULL;
-	}
+	kfree(cs->dc.icc.mon_rx);
+	cs->dc.icc.mon_rx = NULL;
+	kfree(cs->dc.icc.mon_tx);
+	cs->dc.icc.mon_tx = NULL;
 }
 
 static void
diff --git a/drivers/isdn/hisax/ipacx.c b/drivers/isdn/hisax/ipacx.c
index efba2f4..2e9afae 100644
--- a/drivers/isdn/hisax/ipacx.c
+++ b/drivers/isdn/hisax/ipacx.c
@@ -762,14 +762,10 @@
 {
 	bch_mode(bcs, 0, bcs->channel);
 	if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
-		if (bcs->hw.hscx.rcvbuf) {
-			kfree(bcs->hw.hscx.rcvbuf);
-			bcs->hw.hscx.rcvbuf = NULL;
-		}
-		if (bcs->blog) {
-			kfree(bcs->blog);
-			bcs->blog = NULL;
-		}
+		kfree(bcs->hw.hscx.rcvbuf);
+		bcs->hw.hscx.rcvbuf = NULL;
+		kfree(bcs->blog);
+		bcs->blog = NULL;
 		skb_queue_purge(&bcs->rqueue);
 		skb_queue_purge(&bcs->squeue);
 		if (bcs->tx_skb) {
diff --git a/drivers/isdn/hisax/isac.c b/drivers/isdn/hisax/isac.c
index 85e063a..565b789 100644
--- a/drivers/isdn/hisax/isac.c
+++ b/drivers/isdn/hisax/isac.c
@@ -570,15 +570,12 @@
 }
 
 static void
-DC_Close_isac(struct IsdnCardState *cs) {
-	if (cs->dc.isac.mon_rx) {
-		kfree(cs->dc.isac.mon_rx);
-		cs->dc.isac.mon_rx = NULL;
-	}
-	if (cs->dc.isac.mon_tx) {
-		kfree(cs->dc.isac.mon_tx);
-		cs->dc.isac.mon_tx = NULL;
-	}
+DC_Close_isac(struct IsdnCardState *cs)
+{
+	kfree(cs->dc.isac.mon_rx);
+	cs->dc.isac.mon_rx = NULL;
+	kfree(cs->dc.isac.mon_tx);
+	cs->dc.isac.mon_tx = NULL;
 }
 
 static void
diff --git a/drivers/isdn/hisax/isar.c b/drivers/isdn/hisax/isar.c
index 642a87c..674af67 100644
--- a/drivers/isdn/hisax/isar.c
+++ b/drivers/isdn/hisax/isar.c
@@ -1688,10 +1688,8 @@
 {
 	modeisar(bcs, 0, bcs->channel);
 	if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
-		if (bcs->hw.isar.rcvbuf) {
-			kfree(bcs->hw.isar.rcvbuf);
-			bcs->hw.isar.rcvbuf = NULL;
-		}
+		kfree(bcs->hw.isar.rcvbuf);
+		bcs->hw.isar.rcvbuf = NULL;
 		skb_queue_purge(&bcs->rqueue);
 		skb_queue_purge(&bcs->squeue);
 		if (bcs->tx_skb) {
diff --git a/drivers/isdn/hisax/jade.c b/drivers/isdn/hisax/jade.c
index 363ae31..2659fec 100644
--- a/drivers/isdn/hisax/jade.c
+++ b/drivers/isdn/hisax/jade.c
@@ -195,14 +195,10 @@
 {
     modejade(bcs, 0, bcs->channel);
     if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
-	if (bcs->hw.hscx.rcvbuf) {
-		kfree(bcs->hw.hscx.rcvbuf);
-		bcs->hw.hscx.rcvbuf = NULL;
-	}
-	if (bcs->blog) {
-		kfree(bcs->blog);
-		bcs->blog = NULL;
-	}
+	kfree(bcs->hw.hscx.rcvbuf);
+	bcs->hw.hscx.rcvbuf = NULL;
+	kfree(bcs->blog);
+	bcs->blog = NULL;
 	skb_queue_purge(&bcs->rqueue);
 	skb_queue_purge(&bcs->squeue);
 	if (bcs->tx_skb) {
diff --git a/drivers/isdn/hisax/netjet.c b/drivers/isdn/hisax/netjet.c
index 94da03c..47a47ef 100644
--- a/drivers/isdn/hisax/netjet.c
+++ b/drivers/isdn/hisax/netjet.c
@@ -855,14 +855,10 @@
 {
 	mode_tiger(bcs, 0, bcs->channel);
 	if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
-		if (bcs->hw.tiger.rcvbuf) {
-			kfree(bcs->hw.tiger.rcvbuf);
-			bcs->hw.tiger.rcvbuf = NULL;
-		}
-		if (bcs->hw.tiger.sendbuf) {
-			kfree(bcs->hw.tiger.sendbuf);
-			bcs->hw.tiger.sendbuf = NULL;
-		}
+		kfree(bcs->hw.tiger.rcvbuf);
+		bcs->hw.tiger.rcvbuf = NULL;
+		kfree(bcs->hw.tiger.sendbuf);
+		bcs->hw.tiger.sendbuf = NULL;
 		skb_queue_purge(&bcs->rqueue);
 		skb_queue_purge(&bcs->squeue);
 		if (bcs->tx_skb) {
@@ -967,20 +963,12 @@
 static void
 releasetiger(struct IsdnCardState *cs)
 {
-	if (cs->bcs[0].hw.tiger.send) {
-		kfree(cs->bcs[0].hw.tiger.send);
-		cs->bcs[0].hw.tiger.send = NULL;
-	}
-	if (cs->bcs[1].hw.tiger.send) {
-		cs->bcs[1].hw.tiger.send = NULL;
-	}
-	if (cs->bcs[0].hw.tiger.rec) {
-		kfree(cs->bcs[0].hw.tiger.rec);
-		cs->bcs[0].hw.tiger.rec = NULL;
-	}
-	if (cs->bcs[1].hw.tiger.rec) {
-		cs->bcs[1].hw.tiger.rec = NULL;
-	}
+	kfree(cs->bcs[0].hw.tiger.send);
+	cs->bcs[0].hw.tiger.send = NULL;
+	cs->bcs[1].hw.tiger.send = NULL;
+	kfree(cs->bcs[0].hw.tiger.rec);
+	cs->bcs[0].hw.tiger.rec = NULL;
+	cs->bcs[1].hw.tiger.rec = NULL;
 }
 
 void
diff --git a/drivers/isdn/hisax/st5481_usb.c b/drivers/isdn/hisax/st5481_usb.c
index 89fbeb5..b096b64 100644
--- a/drivers/isdn/hisax/st5481_usb.c
+++ b/drivers/isdn/hisax/st5481_usb.c
@@ -335,14 +335,12 @@
 
 	// Stop and free Control and Interrupt URBs
 	usb_kill_urb(ctrl->urb);
-	if (ctrl->urb->transfer_buffer)
-		kfree(ctrl->urb->transfer_buffer);
+	kfree(ctrl->urb->transfer_buffer);
 	usb_free_urb(ctrl->urb);
 	ctrl->urb = NULL;
 
 	usb_kill_urb(intr->urb);
-	if (intr->urb->transfer_buffer)
-		kfree(intr->urb->transfer_buffer);
+	kfree(intr->urb->transfer_buffer);
 	usb_free_urb(intr->urb);
 	ctrl->urb = NULL;
 }
@@ -457,8 +455,7 @@
  err:
 	for (j = 0; j < 2; j++) {
 		if (urb[j]) {
-			if (urb[j]->transfer_buffer)
-				kfree(urb[j]->transfer_buffer);
+			kfree(urb[j]->transfer_buffer);
 			urb[j]->transfer_buffer = NULL;
 			usb_free_urb(urb[j]);
 			urb[j] = NULL;
@@ -473,8 +470,7 @@
 
 	for (j = 0; j < 2; j++) {
 		usb_kill_urb(urb[j]);
-		if (urb[j]->transfer_buffer)
-			kfree(urb[j]->transfer_buffer);			
+		kfree(urb[j]->transfer_buffer);
 		usb_free_urb(urb[j]);
 		urb[j] = NULL;
 	}
diff --git a/drivers/isdn/hisax/w6692.c b/drivers/isdn/hisax/w6692.c
index 7baf8e4..0352ee5 100644
--- a/drivers/isdn/hisax/w6692.c
+++ b/drivers/isdn/hisax/w6692.c
@@ -819,14 +819,10 @@
 {
 	W6692Bmode(bcs, 0, bcs->channel);
 	if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
-		if (bcs->hw.w6692.rcvbuf) {
-			kfree(bcs->hw.w6692.rcvbuf);
-			bcs->hw.w6692.rcvbuf = NULL;
-		}
-		if (bcs->blog) {
-			kfree(bcs->blog);
-			bcs->blog = NULL;
-		}
+		kfree(bcs->hw.w6692.rcvbuf);
+		bcs->hw.w6692.rcvbuf = NULL;
+		kfree(bcs->blog);
+		bcs->blog = NULL;
 		skb_queue_purge(&bcs->rqueue);
 		skb_queue_purge(&bcs->squeue);
 		if (bcs->tx_skb) {
diff --git a/drivers/isdn/hysdn/hysdn_procconf.c b/drivers/isdn/hysdn/hysdn_procconf.c
index 639582f..87f59a0 100644
--- a/drivers/isdn/hysdn/hysdn_procconf.c
+++ b/drivers/isdn/hysdn/hysdn_procconf.c
@@ -359,8 +359,7 @@
 	} else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
 		/* read access -> output card info data */
 
-		if (filep->private_data)
-			kfree(filep->private_data);	/* release memory */
+		kfree(filep->private_data);	/* release memory */
 	}
 	unlock_kernel();
 	return (retval);
diff --git a/drivers/isdn/i4l/isdn_ppp.c b/drivers/isdn/i4l/isdn_ppp.c
index d97a9be..1a19a0f 100644
--- a/drivers/isdn/i4l/isdn_ppp.c
+++ b/drivers/isdn/i4l/isdn_ppp.c
@@ -364,10 +364,8 @@
 		isdn_net_hangup(&p->dev);
 	}
 	for (i = 0; i < NUM_RCV_BUFFS; i++) {
-		if (is->rq[i].buf) {
-			kfree(is->rq[i].buf);
-			is->rq[i].buf = NULL;
-		}
+		kfree(is->rq[i].buf);
+		is->rq[i].buf = NULL;
 	}
 	is->first = is->rq + NUM_RCV_BUFFS - 1;	/* receive queue */
 	is->last = is->rq;
@@ -378,14 +376,10 @@
 	is->slcomp = NULL;
 #endif
 #ifdef CONFIG_IPPP_FILTER
-	if (is->pass_filter) {
-		kfree(is->pass_filter);
-		is->pass_filter = NULL;
-	}
-	if (is->active_filter) {
-		kfree(is->active_filter);
-		is->active_filter = NULL;
-	}
+	kfree(is->pass_filter);
+	is->pass_filter = NULL;
+	kfree(is->active_filter);
+	is->active_filter = NULL;
 #endif
 
 /* TODO: if this was the previous master: link the stuff to the new master */
@@ -914,8 +908,7 @@
 		kfree(ippp_table[i]);
 
 #ifdef CONFIG_ISDN_MPP
-	if (isdn_ppp_bundle_arr)
-		kfree(isdn_ppp_bundle_arr);
+	kfree(isdn_ppp_bundle_arr);
 #endif /* CONFIG_ISDN_MPP */
 
 }
diff --git a/drivers/isdn/i4l/isdn_tty.c b/drivers/isdn/i4l/isdn_tty.c
index 356ee48..8c404b4 100644
--- a/drivers/isdn/i4l/isdn_tty.c
+++ b/drivers/isdn/i4l/isdn_tty.c
@@ -712,22 +712,14 @@
 #endif
 	info->emu.vpar[4] = 0;
 	info->emu.vpar[5] = 8;
-	if (info->dtmf_state) {
-		kfree(info->dtmf_state);
-		info->dtmf_state = NULL;
-	}
-	if (info->silence_state) {
-		kfree(info->silence_state);
-		info->silence_state = NULL;
-	}
-	if (info->adpcms) {
-		kfree(info->adpcms);
-		info->adpcms = NULL;
-	}
-	if (info->adpcmr) {
-		kfree(info->adpcmr);
-		info->adpcmr = NULL;
-	}
+	kfree(info->dtmf_state);
+	info->dtmf_state = NULL;
+	kfree(info->silence_state);
+	info->silence_state = NULL;
+	kfree(info->adpcms);
+	info->adpcms = NULL;
+	kfree(info->adpcmr);
+	info->adpcmr = NULL;
 #endif
 	if ((info->msr & UART_MSR_RI) &&
 		(info->emu.mdmreg[REG_RUNG] & BIT_RUNG))
diff --git a/drivers/isdn/pcbit/drv.c b/drivers/isdn/pcbit/drv.c
index 5de861f..94f2148 100644
--- a/drivers/isdn/pcbit/drv.c
+++ b/drivers/isdn/pcbit/drv.c
@@ -561,10 +561,8 @@
 		else
 			pcbit_fsm_event(dev, chan, EV_USR_RELEASE_REQ, NULL);
 
-		if (cbdata.data.setup.CalledPN)
-			kfree(cbdata.data.setup.CalledPN);
-		if (cbdata.data.setup.CallingPN)
-			kfree(cbdata.data.setup.CallingPN);
+		kfree(cbdata.data.setup.CalledPN);
+		kfree(cbdata.data.setup.CallingPN);
 		break;
     
 	case MSG_CONN_CONF: