diff --git a/drivers/net/3c515.c b/drivers/net/3c515.c
index 684bab7..6ab84b6 100644
--- a/drivers/net/3c515.c
+++ b/drivers/net/3c515.c
@@ -1361,7 +1361,7 @@
 			/* Check if the packet is long enough to just accept without
 			   copying to a properly sized skbuff. */
 			if (pkt_len < rx_copybreak
-			    && (skb = dev_alloc_skb(pkt_len + 4)) != 0) {
+			    && (skb = dev_alloc_skb(pkt_len + 4)) != NULL) {
 				skb_reserve(skb, 2);	/* Align IP on 16 byte boundaries */
 				/* 'skb_put()' points to the start of sk_buff data area. */
 				memcpy(skb_put(skb, pkt_len),
diff --git a/drivers/net/7990.c b/drivers/net/7990.c
index 224e0bf..750a46f 100644
--- a/drivers/net/7990.c
+++ b/drivers/net/7990.c
@@ -277,8 +277,6 @@
         volatile struct lance_init_block *ib = lp->init_block;
         volatile struct lance_rx_desc *rd;
         unsigned char bits;
-        int len = 0;                    /* XXX shut up gcc warnings */
-        struct sk_buff *skb = 0;        /* XXX shut up gcc warnings */
 #ifdef TEST_HITS
         int i;
 #endif
@@ -318,10 +316,10 @@
                         if (bits & LE_R1_FRA) dev->stats.rx_frame_errors++;
                         if (bits & LE_R1_EOP) dev->stats.rx_errors++;
                 } else {
-                        len = (rd->mblength & 0xfff) - 4;
-                        skb = dev_alloc_skb (len+2);
+			int len = (rd->mblength & 0xfff) - 4;
+			struct sk_buff *skb = dev_alloc_skb (len+2);
 
-                        if (skb == 0) {
+                        if (!skb) {
                                 printk ("%s: Memory squeeze, deferring packet.\n",
                                         dev->name);
                                 dev->stats.rx_dropped++;
diff --git a/drivers/net/a2065.c b/drivers/net/a2065.c
index 18f7f81..6c5719a 100644
--- a/drivers/net/a2065.c
+++ b/drivers/net/a2065.c
@@ -269,8 +269,6 @@
 	volatile struct lance_regs *ll = lp->ll;
 	volatile struct lance_rx_desc *rd;
 	unsigned char bits;
-	int len = 0;			/* XXX shut up gcc warnings */
-	struct sk_buff *skb = 0;	/* XXX shut up gcc warnings */
 
 #ifdef TEST_HITS
 	int i;
@@ -306,10 +304,10 @@
 			if (bits & LE_R1_FRA) dev->stats.rx_frame_errors++;
 			if (bits & LE_R1_EOP) dev->stats.rx_errors++;
 		} else {
-			len = (rd->mblength & 0xfff) - 4;
-			skb = dev_alloc_skb (len+2);
+			int len = (rd->mblength & 0xfff) - 4;
+			struct sk_buff *skb = dev_alloc_skb (len+2);
 
-			if (skb == 0) {
+			if (!skb) {
 				printk(KERN_WARNING "%s: Memory squeeze, "
 				       "deferring packet.\n", dev->name);
 				dev->stats.rx_dropped++;
@@ -477,7 +475,7 @@
 	return IRQ_HANDLED;
 }
 
-struct net_device *last_dev = 0;
+struct net_device *last_dev;
 
 static int lance_open (struct net_device *dev)
 {
diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index 94d1857..3bb69d5 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -2757,7 +2757,7 @@
 		}
 
 #ifdef BCM_VLAN
-		if ((status & L2_FHDR_STATUS_L2_VLAN_TAG) && (bp->vlgrp != 0)) {
+		if ((status & L2_FHDR_STATUS_L2_VLAN_TAG) && bp->vlgrp) {
 			vlan_hwaccel_receive_skb(skb, bp->vlgrp,
 				rx_hdr->l2_fhdr_vlan_tag);
 		}
@@ -5660,7 +5660,7 @@
 		vlan_tag_flags |= TX_BD_FLAGS_TCP_UDP_CKSUM;
 	}
 
-	if (bp->vlgrp != 0 && vlan_tx_tag_present(skb)) {
+	if (bp->vlgrp && vlan_tx_tag_present(skb)) {
 		vlan_tag_flags |=
 			(TX_BD_FLAGS_VLAN_TAG | (vlan_tx_tag_get(skb) << 16));
 	}
diff --git a/drivers/net/cassini.c b/drivers/net/cassini.c
index 2bacb5e..14299f8 100644
--- a/drivers/net/cassini.c
+++ b/drivers/net/cassini.c
@@ -5085,7 +5085,7 @@
 
 	/* give us access to cassini registers */
 	cp->regs = pci_iomap(pdev, 0, casreg_len);
-	if (cp->regs == 0UL) {
+	if (!cp->regs) {
 		dev_err(&pdev->dev, "Cannot map device registers, aborting.\n");
 		goto err_out_free_res;
 	}
diff --git a/drivers/net/eepro100.c b/drivers/net/eepro100.c
index 1548a80..3003e92 100644
--- a/drivers/net/eepro100.c
+++ b/drivers/net/eepro100.c
@@ -1788,7 +1788,7 @@
 			/* Check if the packet is long enough to just accept without
 			   copying to a properly sized skbuff. */
 			if (pkt_len < rx_copybreak
-				&& (skb = dev_alloc_skb(pkt_len + 2)) != 0) {
+				&& (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
 				skb_reserve(skb, 2);	/* Align IP on 16 byte boundaries */
 				/* 'skb_put()' points to the start of sk_buff data area. */
 				pci_dma_sync_single_for_cpu(sp->pdev, sp->rx_ring_dma[entry],
diff --git a/drivers/net/hamradio/6pack.c b/drivers/net/hamradio/6pack.c
index 580cb4a..0a9b751 100644
--- a/drivers/net/hamradio/6pack.c
+++ b/drivers/net/hamradio/6pack.c
@@ -701,7 +701,7 @@
 	sp = tty->disc_data;
 	tty->disc_data = NULL;
 	write_unlock(&disc_data_lock);
-	if (sp == 0)
+	if (!sp)
 		return;
 
 	/*
diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index 803a3bd..cfcd15a 100644
--- a/drivers/net/hamradio/mkiss.c
+++ b/drivers/net/hamradio/mkiss.c
@@ -821,7 +821,7 @@
 	tty->disc_data = NULL;
 	write_unlock(&disc_data_lock);
 
-	if (ax == 0)
+	if (!ax)
 		return;
 
 	/*
diff --git a/drivers/net/hp100.c b/drivers/net/hp100.c
index 49421d1..571dd80 100644
--- a/drivers/net/hp100.c
+++ b/drivers/net/hp100.c
@@ -1153,7 +1153,7 @@
 	printk("hp100: %s: init pdls\n", dev->name);
 #endif
 
-	if (0 == lp->page_vaddr_algn)
+	if (!lp->page_vaddr_algn)
 		printk("hp100: %s: Warning: lp->page_vaddr_algn not initialised!\n", dev->name);
 	else {
 		/* pageptr shall point into the DMA accessible memory region  */
diff --git a/drivers/net/mac89x0.c b/drivers/net/mac89x0.c
index a19b595..2a66e5b 100644
--- a/drivers/net/mac89x0.c
+++ b/drivers/net/mac89x0.c
@@ -289,7 +289,7 @@
 	err = register_netdev(dev);
 	if (err)
 		goto out1;
-	return 0;
+	return NULL;
 out1:
 	nubus_writew(0, dev->base_addr + ADD_PORT);
 out:
diff --git a/drivers/net/mace.c b/drivers/net/mace.c
index 95ebe72..451acdc 100644
--- a/drivers/net/mace.c
+++ b/drivers/net/mace.c
@@ -409,7 +409,7 @@
 
     /* free some skb's */
     for (i = 0; i < N_RX_RING; ++i) {
-	if (mp->rx_bufs[i] != 0) {
+	if (mp->rx_bufs[i] != NULL) {
 	    dev_kfree_skb(mp->rx_bufs[i]);
 	    mp->rx_bufs[i] = NULL;
 	}
@@ -441,7 +441,7 @@
     cp = mp->rx_cmds;
     for (i = 0; i < N_RX_RING - 1; ++i) {
 	skb = dev_alloc_skb(RX_BUFLEN + 2);
-	if (skb == 0) {
+	if (!skb) {
 	    data = dummy_buf;
 	} else {
 	    skb_reserve(skb, 2);	/* so IP header lands on 4-byte bdry */
@@ -903,7 +903,7 @@
 	out_le16(&cp->command, DBDMA_STOP);
 	/* got a packet, have a look at it */
 	skb = mp->rx_bufs[i];
-	if (skb == 0) {
+	if (!skb) {
 	    ++dev->stats.rx_dropped;
 	} else if (nb > 8) {
 	    data = skb->data;
@@ -953,9 +953,9 @@
 	    break;
 	cp = mp->rx_cmds + i;
 	skb = mp->rx_bufs[i];
-	if (skb == 0) {
+	if (!skb) {
 	    skb = dev_alloc_skb(RX_BUFLEN + 2);
-	    if (skb != 0) {
+	    if (skb) {
 		skb_reserve(skb, 2);
 		mp->rx_bufs[i] = skb;
 	    }
diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 97ba14b..2341b89 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -354,8 +354,8 @@
 		goto err_out_free_netdev;
 	}
 
-	if (((mem_ptr0 == 0UL) && (mem_len == NETXEN_PCI_128MB_SIZE)) ||
-			(mem_ptr1 == 0UL) || (mem_ptr2 == 0UL)) {
+	if ((!mem_ptr0 && mem_len == NETXEN_PCI_128MB_SIZE) ||
+			!mem_ptr1 || !mem_ptr2) {
 		DPRINTK(ERR,
 			"Cannot remap adapter memory aborting.:"
 			"0 -> %p, 1 -> %p, 2 -> %p\n",
@@ -1337,7 +1337,7 @@
 
 static int __init netxen_init_module(void)
 {
-	if ((netxen_workq = create_singlethread_workqueue("netxen")) == 0)
+	if ((netxen_workq = create_singlethread_workqueue("netxen")) == NULL)
 		return -ENOMEM;
 
 	return pci_register_driver(&netxen_driver);
diff --git a/drivers/net/skfp/hwmtm.c b/drivers/net/skfp/hwmtm.c
index 438f424..8a430a3 100644
--- a/drivers/net/skfp/hwmtm.c
+++ b/drivers/net/skfp/hwmtm.c
@@ -1746,7 +1746,7 @@
 	DB_GEN("queue_llc_rx: mb = %x",(void *)mb,0,4) ;
 	smc->os.hwm.queued_rx_frames++ ;
 	mb->sm_next = (SMbuf *)NULL ;
-	if (smc->os.hwm.llc_rx_pipe == 0) {
+	if (smc->os.hwm.llc_rx_pipe == NULL) {
 		smc->os.hwm.llc_rx_pipe = mb ;
 	}
 	else {
@@ -1786,7 +1786,7 @@
 	DB_GEN("_rx: queue_txd_mb = %x",(void *)mb,0,4) ;
 	smc->os.hwm.queued_txd_mb++ ;
 	mb->sm_next = (SMbuf *)NULL ;
-	if (smc->os.hwm.txd_tx_pipe == 0) {
+	if (smc->os.hwm.txd_tx_pipe == NULL) {
 		smc->os.hwm.txd_tx_pipe = mb ;
 	}
 	else {
diff --git a/drivers/net/skfp/smt.c b/drivers/net/skfp/smt.c
index ced2c8f..ffbfb1b 100644
--- a/drivers/net/skfp/smt.c
+++ b/drivers/net/skfp/smt.c
@@ -712,7 +712,7 @@
 			smc->mib.priv.fddiPRIVECF_Reply_Rx++ ;
 			DB_SMT("SMT: received ECF reply from %s\n",
 				addr_to_string(&sm->smt_source),0) ;
-			if (sm_to_para(smc,sm,SMT_P_ECHODATA) == 0) {
+			if (sm_to_para(smc,sm,SMT_P_ECHODATA) == NULL) {
 				DB_SMT("SMT: ECHODATA missing\n",0,0) ;
 				break ;
 			}
diff --git a/drivers/net/sungem.c b/drivers/net/sungem.c
index 467d80d..9721279 100644
--- a/drivers/net/sungem.c
+++ b/drivers/net/sungem.c
@@ -3056,7 +3056,7 @@
 	netif_carrier_off(dev);
 
 	gp->regs = ioremap(gemreg_base, gemreg_len);
-	if (gp->regs == 0UL) {
+	if (!gp->regs) {
 		printk(KERN_ERR PFX "Cannot map device registers, "
 		       "aborting.\n");
 		err = -EIO;
diff --git a/drivers/net/sunhme.c b/drivers/net/sunhme.c
index 25ce26a..b4e7f30 100644
--- a/drivers/net/sunhme.c
+++ b/drivers/net/sunhme.c
@@ -3060,7 +3060,7 @@
 		goto err_out_clear_quattro;
 	}
 
-	if ((hpreg_base = ioremap(hpreg_res, 0x8000)) == 0) {
+	if ((hpreg_base = ioremap(hpreg_res, 0x8000)) == NULL) {
 		printk(KERN_ERR "happymeal(PCI): Unable to remap card memory.\n");
 		goto err_out_free_res;
 	}
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index a9f1640..db606b6 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -12675,7 +12675,7 @@
 		tg3reg_len = pci_resource_len(pdev, 2);
 
 		tp->aperegs = ioremap_nocache(tg3reg_base, tg3reg_len);
-		if (tp->aperegs == 0UL) {
+		if (!tp->aperegs) {
 			printk(KERN_ERR PFX "Cannot map APE registers, "
 			       "aborting.\n");
 			err = -ENOMEM;
diff --git a/drivers/net/tokenring/smctr.c b/drivers/net/tokenring/smctr.c
index 93da3a3..8909050 100644
--- a/drivers/net/tokenring/smctr.c
+++ b/drivers/net/tokenring/smctr.c
@@ -2310,7 +2310,7 @@
                                                 && (tp->acb_head->subcmd
                                                 == RW_TRC_STATUS_BLOCK))
                                         {
-                                                if(tp->ptr_bcn_type != 0)
+                                                if(tp->ptr_bcn_type)
                                                 {
                                                         *(tp->ptr_bcn_type)
                                                                 = (__u32)((SBlock *)tp->misc_command_data)->BCN_Type;
@@ -2980,7 +2980,7 @@
                 return (UCODE_PRESENT);
 
         /* Verify the firmware exists and is there in the right amount. */
-        if((tp->ptr_ucode == 0L)
+        if (!tp->ptr_ucode
                 || (*(tp->ptr_ucode + UCODE_VERSION_OFFSET) < UCODE_VERSION))
         {
                 return (UCODE_NOT_PRESENT);
diff --git a/drivers/net/wan/lmc/lmc_main.c b/drivers/net/wan/lmc/lmc_main.c
index 37c52e1..6635ece 100644
--- a/drivers/net/wan/lmc/lmc_main.c
+++ b/drivers/net/wan/lmc/lmc_main.c
@@ -491,13 +491,13 @@
                     int pos;
                     int timeout = 500000;
 
-                    if(xc.data == 0x0){
+                    if (!xc.data) {
                             ret = -EINVAL;
                             break;
                     }
 
                     data = kmalloc(xc.len, GFP_KERNEL);
-                    if(data == 0x0){
+                    if (!data) {
                             printk(KERN_WARNING "%s: Failed to allocate memory for copy\n", dev->name);
                             ret = -ENOMEM;
                             break;
@@ -1643,7 +1643,7 @@
          * just allocate an skb buff and continue.
          */
         
-        if(skb == 0x0){
+        if (!skb) {
             nsb = dev_alloc_skb (LMC_PKT_BUF_SZ + 2);
             if (nsb) {
                 sc->lmc_rxq[i] = nsb;
diff --git a/drivers/net/wan/lmc/lmc_media.c b/drivers/net/wan/lmc/lmc_media.c
index c9c878c..8aa461c 100644
--- a/drivers/net/wan/lmc/lmc_media.c
+++ b/drivers/net/wan/lmc/lmc_media.c
@@ -1219,10 +1219,6 @@
 static void
 lmc_set_protocol (lmc_softc_t * const sc, lmc_ctl_t * ctl)
 {
-  if (ctl == 0)
-    {
-      sc->ictl.keepalive_onoff = LMC_CTL_ON;
-
-      return;
-    }
+	if (!ctl)
+		sc->ictl.keepalive_onoff = LMC_CTL_ON;
 }
diff --git a/drivers/net/wan/pc300_drv.c b/drivers/net/wan/pc300_drv.c
index 99fee2f..57914fb 100644
--- a/drivers/net/wan/pc300_drv.c
+++ b/drivers/net/wan/pc300_drv.c
@@ -2365,17 +2365,17 @@
 
 static irqreturn_t cpc_intr(int irq, void *dev_id)
 {
-	pc300_t *card;
+	pc300_t *card = dev_id;
 	volatile ucchar plx_status;
 
-	if ((card = (pc300_t *) dev_id) == 0) {
+	if (!card) {
 #ifdef PC300_DEBUG_INTR
 		printk("cpc_intr: spurious intr %d\n", irq);
 #endif
 		return IRQ_NONE;		/* spurious intr */
 	}
 
-	if (card->hw.rambase == 0) {
+	if (!card->hw.rambase) {
 #ifdef PC300_DEBUG_INTR
 		printk("cpc_intr: spurious intr2 %d\n", irq);
 #endif
@@ -3648,7 +3648,7 @@
 {
 	pc300_t *card = pci_get_drvdata(pdev);
 
-	if (card->hw.rambase != 0) {
+	if (card->hw.rambase) {
 		int i;
 
 		/* Disable interrupts on the PCI bridge */
diff --git a/drivers/net/wan/pc300_tty.c b/drivers/net/wan/pc300_tty.c
index e24a7b0..63abfd7 100644
--- a/drivers/net/wan/pc300_tty.c
+++ b/drivers/net/wan/pc300_tty.c
@@ -313,7 +313,7 @@
 	if (cpc_tty->num_open == 0) { /* first open of this tty */
 		if (!cpc_tty_area[port].buf_tx){
 			cpc_tty_area[port].buf_tx = kmalloc(CPC_TTY_MAX_MTU,GFP_KERNEL);
-			if (cpc_tty_area[port].buf_tx == 0){
+			if (!cpc_tty_area[port].buf_tx) {
 				CPC_TTY_DBG("%s: error in memory allocation\n",cpc_tty->name);
 				return -ENOMEM;
 			}
@@ -678,7 +678,7 @@
 		for (j=0; j < CPC_TTY_NPORTS; j++) {
 			cpc_tty = &cpc_tty_area[port];
 		
-			if ((buf=cpc_tty->buf_rx.first) != 0) {
+			if ((buf=cpc_tty->buf_rx.first) != NULL) {
 				if (cpc_tty->tty) {
 					ld = tty_ldisc_ref(cpc_tty->tty);
 					if (ld) {
@@ -784,7 +784,7 @@
 		} 
 		
 		new = kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC);
-		if (new == 0) {
+		if (!new) {
 			cpc_tty_rx_disc_frame(pc300chan);
 			continue;
 		}
@@ -863,7 +863,7 @@
 			} 
 			new->size = rx_len;
 			new->next = NULL;
-			if (cpc_tty->buf_rx.first == 0) {
+			if (cpc_tty->buf_rx.first == NULL) {
 				cpc_tty->buf_rx.first = new;
 				cpc_tty->buf_rx.last = new;
 			} else {
@@ -891,7 +891,7 @@
 
 	CPC_TTY_DBG("%s: cpc_tty_tx_work init\n",cpc_tty->name);
 	
-	if ((tty = cpc_tty->tty) == 0) { 
+	if ((tty = cpc_tty->tty) == NULL) { 
 		CPC_TTY_DBG("%s: the interface is not opened\n",cpc_tty->name);
 		return; 
 	}
@@ -1027,7 +1027,7 @@
 	ulong flags;
 	int res;
 
-	if ((cpc_tty= (st_cpc_tty_area *) pc300dev->cpc_tty) == 0) { 
+	if ((cpc_tty= (st_cpc_tty_area *) pc300dev->cpc_tty) == NULL) {
 		CPC_TTY_DBG("%s: interface is not TTY\n", pc300dev->dev->name);
 		return; 
 	}
diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index 42670ac..be9aa4e 100644
--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -2032,7 +2032,7 @@
 
 	/* get a packet to send */
 
-	if ((skb = skb_dequeue(&ai->txq)) == 0) {
+	if ((skb = skb_dequeue(&ai->txq)) == NULL) {
 		airo_print_err(dev->name,
 			"%s: Dequeue'd zero in send_packet()",
 			__FUNCTION__);
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index bca37bf..7483d45b 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1073,7 +1073,7 @@
 		if (!xen_feature(XENFEAT_auto_translated_physmap)) {
 			/* Do all the remapping work and M2P updates. */
 			MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu,
-					 0, DOMID_SELF);
+					 NULL, DOMID_SELF);
 			mcl++;
 			HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl);
 		}