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Date:	Mon, 12 Nov 2007 15:33:51 -0800
From:	Joe Perches <joe@...ches.com>
To:	Paul Mackerras <paulus@...ba.org>, linux-ppp@...r.kernel.org
Cc:	netdev <netdev@...r.kernel.org>, Jeff Garzik <jgarzik@...ox.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] - drivers/net/ppp_* - remove ptr comparisons to 0

fix sparse warnings "Using plain integer as NULL pointer"

Signed-off-by: Joe Perches <joe@...ches.com>

---

 drivers/net/ppp_async.c   |   34 ++++++------
 drivers/net/ppp_generic.c |  126 ++++++++++++++++++++++----------------------
 drivers/net/ppp_synctty.c |   27 +++++-----
 3 files changed, 94 insertions(+), 93 deletions(-)

diff --git a/drivers/net/ppp_async.c b/drivers/net/ppp_async.c
index 8d278c8..f023d5b 100644
--- a/drivers/net/ppp_async.c
+++ b/drivers/net/ppp_async.c
@@ -160,7 +160,7 @@ ppp_asynctty_open(struct tty_struct *tty)
 
 	err = -ENOMEM;
 	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
-	if (ap == 0)
+	if (!ap)
 		goto out;
 
 	/* initialize the asyncppp structure */
@@ -215,7 +215,7 @@ ppp_asynctty_close(struct tty_struct *tty)
 	ap = tty->disc_data;
 	tty->disc_data = NULL;
 	write_unlock_irq(&disc_data_lock);
-	if (ap == 0)
+	if (!ap)
 		return;
 
 	/*
@@ -230,10 +230,10 @@ ppp_asynctty_close(struct tty_struct *tty)
 	tasklet_kill(&ap->tsk);
 
 	ppp_unregister_channel(&ap->chan);
-	if (ap->rpkt != 0)
+	if (ap->rpkt)
 		kfree_skb(ap->rpkt);
 	skb_queue_purge(&ap->rqueue);
-	if (ap->tpkt != 0)
+	if (ap->tpkt)
 		kfree_skb(ap->tpkt);
 	kfree(ap);
 }
@@ -285,13 +285,13 @@ ppp_asynctty_ioctl(struct tty_struct *tty, struct file *file,
 	int err, val;
 	int __user *p = (int __user *)arg;
 
-	if (ap == 0)
+	if (!ap)
 		return -ENXIO;
 	err = -EFAULT;
 	switch (cmd) {
 	case PPPIOCGCHAN:
 		err = -ENXIO;
-		if (ap == 0)
+		if (!ap)
 			break;
 		err = -EFAULT;
 		if (put_user(ppp_channel_index(&ap->chan), p))
@@ -301,7 +301,7 @@ ppp_asynctty_ioctl(struct tty_struct *tty, struct file *file,
 
 	case PPPIOCGUNIT:
 		err = -ENXIO;
-		if (ap == 0)
+		if (!ap)
 			break;
 		err = -EFAULT;
 		if (put_user(ppp_unit_number(&ap->chan), p))
@@ -350,7 +350,7 @@ ppp_asynctty_receive(struct tty_struct *tty, const unsigned char *buf,
 	struct asyncppp *ap = ap_get(tty);
 	unsigned long flags;
 
-	if (ap == 0)
+	if (!ap)
 		return;
 	spin_lock_irqsave(&ap->recv_lock, flags);
 	ppp_async_input(ap, buf, cflags, count);
@@ -369,7 +369,7 @@ ppp_asynctty_wakeup(struct tty_struct *tty)
 	struct asyncppp *ap = ap_get(tty);
 
 	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
-	if (ap == 0)
+	if (!ap)
 		return;
 	set_bit(XMIT_WAKEUP, &ap->xmit_flags);
 	tasklet_schedule(&ap->tsk);
@@ -684,7 +684,7 @@ ppp_async_push(struct asyncppp *ap)
 				tty_stuffed = 1;
 			continue;
 		}
-		if (ap->optr >= ap->olim && ap->tpkt != 0) {
+		if (ap->optr >= ap->olim && ap->tpkt) {
 			if (ppp_async_encode(ap)) {
 				/* finished processing ap->tpkt */
 				clear_bit(XMIT_FULL, &ap->xmit_flags);
@@ -704,7 +704,7 @@ ppp_async_push(struct asyncppp *ap)
 		clear_bit(XMIT_BUSY, &ap->xmit_flags);
 		/* any more work to do? if not, exit the loop */
 		if (!(test_bit(XMIT_WAKEUP, &ap->xmit_flags)
-		      || (!tty_stuffed && ap->tpkt != 0)))
+		      || (!tty_stuffed && ap->tpkt)))
 			break;
 		/* more work to do, see if we can do it now */
 		if (test_and_set_bit(XMIT_BUSY, &ap->xmit_flags))
@@ -715,7 +715,7 @@ ppp_async_push(struct asyncppp *ap)
 
 flush:
 	clear_bit(XMIT_BUSY, &ap->xmit_flags);
-	if (ap->tpkt != 0) {
+	if (ap->tpkt) {
 		kfree_skb(ap->tpkt);
 		ap->tpkt = NULL;
 		clear_bit(XMIT_FULL, &ap->xmit_flags);
@@ -848,7 +848,7 @@ ppp_async_input(struct asyncppp *ap, const unsigned char *buf,
 		s = 0;
 		for (i = 0; i < count; ++i) {
 			c = buf[i];
-			if (flags != 0 && flags[i] != 0)
+			if (flags && flags[i] != 0)
 				continue;
 			s |= (c & 0x80)? SC_RCV_B7_1: SC_RCV_B7_0;
 			c = ((c >> 4) ^ c) & 0xf;
@@ -865,7 +865,7 @@ ppp_async_input(struct asyncppp *ap, const unsigned char *buf,
 			n = scan_ordinary(ap, buf, count);
 
 		f = 0;
-		if (flags != 0 && (ap->state & SC_TOSS) == 0) {
+		if (flags && (ap->state & SC_TOSS) == 0) {
 			/* check the flags to see if any char had an error */
 			for (j = 0; j < n; ++j)
 				if ((f = flags[j]) != 0)
@@ -878,9 +878,9 @@ ppp_async_input(struct asyncppp *ap, const unsigned char *buf,
 		} else if (n > 0 && (ap->state & SC_TOSS) == 0) {
 			/* stuff the chars in the skb */
 			skb = ap->rpkt;
-			if (skb == 0) {
+			if (!skb) {
 				skb = dev_alloc_skb(ap->mru + PPP_HDRLEN + 2);
-				if (skb == 0)
+				if (!skb)
 					goto nomem;
  				ap->rpkt = skb;
  			}
@@ -927,7 +927,7 @@ ppp_async_input(struct asyncppp *ap, const unsigned char *buf,
 		++n;
 
 		buf += n;
-		if (flags != 0)
+		if (flags)
 			flags += n;
 		count -= n;
 	}
diff --git a/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c
index 4b49d0e..4f69037 100644
--- a/drivers/net/ppp_generic.c
+++ b/drivers/net/ppp_generic.c
@@ -367,7 +367,7 @@ static int ppp_release(struct inode *inode, struct file *file)
 	struct ppp_file *pf = file->private_data;
 	struct ppp *ppp;
 
-	if (pf != 0) {
+	if (pf) {
 		file->private_data = NULL;
 		if (pf->kind == INTERFACE) {
 			ppp = PF_TO_PPP(pf);
@@ -398,7 +398,7 @@ static ssize_t ppp_read(struct file *file, char __user *buf,
 
 	ret = count;
 
-	if (pf == 0)
+	if (!pf)
 		return -ENXIO;
 	add_wait_queue(&pf->rwait, &wait);
 	for (;;) {
@@ -431,7 +431,7 @@ static ssize_t ppp_read(struct file *file, char __user *buf,
 	set_current_state(TASK_RUNNING);
 	remove_wait_queue(&pf->rwait, &wait);
 
-	if (skb == 0)
+	if (!skb)
 		goto out;
 
 	ret = -EOVERFLOW;
@@ -455,11 +455,11 @@ static ssize_t ppp_write(struct file *file, const char __user *buf,
 	struct sk_buff *skb;
 	ssize_t ret;
 
-	if (pf == 0)
+	if (!pf)
 		return -ENXIO;
 	ret = -ENOMEM;
 	skb = alloc_skb(count + pf->hdrlen, GFP_KERNEL);
-	if (skb == 0)
+	if (!skb)
 		goto out;
 	skb_reserve(skb, pf->hdrlen);
 	ret = -EFAULT;
@@ -491,11 +491,11 @@ static unsigned int ppp_poll(struct file *file, poll_table *wait)
 	struct ppp_file *pf = file->private_data;
 	unsigned int mask;
 
-	if (pf == 0)
+	if (!pf)
 		return 0;
 	poll_wait(file, &pf->rwait, wait);
 	mask = POLLOUT | POLLWRNORM;
-	if (skb_peek(&pf->rq) != 0)
+	if (skb_peek(&pf->rq))
 		mask |= POLLIN | POLLRDNORM;
 	if (pf->dead)
 		mask |= POLLHUP;
@@ -559,7 +559,7 @@ static int ppp_ioctl(struct inode *inode, struct file *file,
 	void __user *argp = (void __user *)arg;
 	int __user *p = argp;
 
-	if (pf == 0)
+	if (!pf)
 		return ppp_unattached_ioctl(pf, file, cmd, arg);
 
 	if (cmd == PPPIOCDETACH) {
@@ -689,13 +689,13 @@ static int ppp_ioctl(struct inode *inode, struct file *file,
 			val &= 0xffff;
 		}
 		vj = slhc_init(val2+1, val+1);
-		if (vj == 0) {
+		if (!vj) {
 			printk(KERN_ERR "PPP: no memory (VJ compressor)\n");
 			err = -ENOMEM;
 			break;
 		}
 		ppp_lock(ppp);
-		if (ppp->vj != 0)
+		if (ppp->vj)
 			slhc_free(ppp->vj);
 		ppp->vj = vj;
 		ppp_unlock(ppp);
@@ -786,7 +786,7 @@ static int ppp_unattached_ioctl(struct ppp_file *pf, struct file *file,
 		if (get_user(unit, p))
 			break;
 		ppp = ppp_create_interface(unit, &err);
-		if (ppp == 0)
+		if (!ppp)
 			break;
 		file->private_data = &ppp->file;
 		ppp->owner = file;
@@ -803,7 +803,7 @@ static int ppp_unattached_ioctl(struct ppp_file *pf, struct file *file,
 		mutex_lock(&all_ppp_mutex);
 		err = -ENXIO;
 		ppp = ppp_find_unit(unit);
-		if (ppp != 0) {
+		if (ppp) {
 			atomic_inc(&ppp->file.refcnt);
 			file->private_data = &ppp->file;
 			err = 0;
@@ -817,7 +817,7 @@ static int ppp_unattached_ioctl(struct ppp_file *pf, struct file *file,
 		spin_lock_bh(&all_channels_lock);
 		err = -ENXIO;
 		chan = ppp_find_channel(unit);
-		if (chan != 0) {
+		if (chan) {
 			atomic_inc(&chan->file.refcnt);
 			file->private_data = &chan->file;
 			err = 0;
@@ -946,9 +946,9 @@ ppp_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 
 	case SIOCGPPPCSTATS:
 		memset(&cstats, 0, sizeof(cstats));
-		if (ppp->xc_state != 0)
+		if (ppp->xc_state)
 			ppp->xcomp->comp_stat(ppp->xc_state, &cstats.c);
-		if (ppp->rc_state != 0)
+		if (ppp->rc_state)
 			ppp->rcomp->decomp_stat(ppp->rc_state, &cstats.d);
 		if (copy_to_user(addr, &cstats, sizeof(cstats)))
 			break;
@@ -993,14 +993,14 @@ ppp_xmit_process(struct ppp *ppp)
 	struct sk_buff *skb;
 
 	ppp_xmit_lock(ppp);
-	if (ppp->dev != 0) {
+	if (ppp->dev) {
 		ppp_push(ppp);
-		while (ppp->xmit_pending == 0
-		       && (skb = skb_dequeue(&ppp->file.xq)) != 0)
+		while (!ppp->xmit_pending
+		       && (skb = skb_dequeue(&ppp->file.xq)))
 			ppp_send_frame(ppp, skb);
 		/* If there's no work left to do, tell the core net
 		   code that we can accept some more. */
-		if (ppp->xmit_pending == 0 && skb_peek(&ppp->file.xq) == 0)
+		if (!ppp->xmit_pending && !skb_peek(&ppp->file.xq))
 			netif_wake_queue(ppp->dev);
 	}
 	ppp_xmit_unlock(ppp);
@@ -1100,12 +1100,12 @@ ppp_send_frame(struct ppp *ppp, struct sk_buff *skb)
 
 	switch (proto) {
 	case PPP_IP:
-		if (ppp->vj == 0 || (ppp->flags & SC_COMP_TCP) == 0)
+		if (!ppp->vj || (ppp->flags & SC_COMP_TCP) == 0)
 			break;
 		/* try to do VJ TCP header compression */
 		new_skb = alloc_skb(skb->len + ppp->dev->hard_header_len - 2,
 				    GFP_ATOMIC);
-		if (new_skb == 0) {
+		if (!new_skb) {
 			printk(KERN_ERR "PPP: no memory (VJ comp pkt)\n");
 			goto drop;
 		}
@@ -1140,7 +1140,7 @@ ppp_send_frame(struct ppp *ppp, struct sk_buff *skb)
 	}
 
 	/* try to do packet compression */
-	if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state != 0
+	if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state
 	    && proto != PPP_LCP && proto != PPP_CCP) {
 		if (!(ppp->flags & SC_CCP_UP) && (ppp->flags & SC_MUST_COMP)) {
 			if (net_ratelimit())
@@ -1185,7 +1185,7 @@ ppp_push(struct ppp *ppp)
 	struct channel *pch;
 	struct sk_buff *skb = ppp->xmit_pending;
 
-	if (skb == 0)
+	if (!skb)
 		return;
 
 	list = &ppp->channels;
@@ -1355,7 +1355,7 @@ static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
 		if (flen == len && nfree == 0)
 			bits |= E;
 		frag = alloc_skb(flen + hdrlen + (flen == 0), GFP_ATOMIC);
-		if (frag == 0)
+		if (!frag)
 			goto noskb;
 		q = skb_put(frag, flen + hdrlen);
 
@@ -1425,7 +1425,7 @@ ppp_channel_push(struct channel *pch)
 	struct ppp *ppp;
 
 	spin_lock_bh(&pch->downl);
-	if (pch->chan != 0) {
+	if (pch->chan) {
 		while (!skb_queue_empty(&pch->file.xq)) {
 			skb = skb_dequeue(&pch->file.xq);
 			if (!pch->chan->ops->start_xmit(pch->chan, skb)) {
@@ -1443,7 +1443,7 @@ ppp_channel_push(struct channel *pch)
 	if (skb_queue_empty(&pch->file.xq)) {
 		read_lock_bh(&pch->upl);
 		ppp = pch->ppp;
-		if (ppp != 0)
+		if (ppp)
 			ppp_xmit_process(ppp);
 		read_unlock_bh(&pch->upl);
 	}
@@ -1462,7 +1462,7 @@ ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
 {
 	ppp_recv_lock(ppp);
 	/* ppp->dev == 0 means interface is closing down */
-	if (ppp->dev != 0)
+	if (ppp->dev)
 		ppp_receive_frame(ppp, skb, pch);
 	else
 		kfree_skb(skb);
@@ -1475,19 +1475,19 @@ ppp_input(struct ppp_channel *chan, struct sk_buff *skb)
 	struct channel *pch = chan->ppp;
 	int proto;
 
-	if (pch == 0 || skb->len == 0) {
+	if (!pch || skb->len == 0) {
 		kfree_skb(skb);
 		return;
 	}
 
 	proto = PPP_PROTO(skb);
 	read_lock_bh(&pch->upl);
-	if (pch->ppp == 0 || proto >= 0xc000 || proto == PPP_CCPFRAG) {
+	if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) {
 		/* put it on the channel queue */
 		skb_queue_tail(&pch->file.rq, skb);
 		/* drop old frames if queue too long */
 		while (pch->file.rq.qlen > PPP_MAX_RQLEN
-		       && (skb = skb_dequeue(&pch->file.rq)) != 0)
+		       && (skb = skb_dequeue(&pch->file.rq)))
 			kfree_skb(skb);
 		wake_up_interruptible(&pch->file.rwait);
 	} else {
@@ -1503,13 +1503,13 @@ ppp_input_error(struct ppp_channel *chan, int code)
 	struct channel *pch = chan->ppp;
 	struct sk_buff *skb;
 
-	if (pch == 0)
+	if (!pch)
 		return;
 
 	read_lock_bh(&pch->upl);
-	if (pch->ppp != 0) {
+	if (pch->ppp) {
 		skb = alloc_skb(0, GFP_ATOMIC);
-		if (skb != 0) {
+		if (skb) {
 			skb->len = 0;		/* probably unnecessary */
 			skb->cb[0] = code;
 			ppp_do_recv(pch->ppp, skb, pch);
@@ -1548,7 +1548,7 @@ static void
 ppp_receive_error(struct ppp *ppp)
 {
 	++ppp->stats.rx_errors;
-	if (ppp->vj != 0)
+	if (ppp->vj)
 		slhc_toss(ppp->vj);
 }
 
@@ -1563,7 +1563,7 @@ ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb)
 	 * Note that some decompressors need to see uncompressed frames
 	 * that come in as well as compressed frames.
 	 */
-	if (ppp->rc_state != 0 && (ppp->rstate & SC_DECOMP_RUN)
+	if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN)
 	    && (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0)
 		skb = ppp_decompress_frame(ppp, skb);
 
@@ -1574,13 +1574,13 @@ ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb)
 	switch (proto) {
 	case PPP_VJC_COMP:
 		/* decompress VJ compressed packets */
-		if (ppp->vj == 0 || (ppp->flags & SC_REJ_COMP_TCP))
+		if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP))
 			goto err;
 
 		if (skb_tailroom(skb) < 124 || skb_cloned(skb)) {
 			/* copy to a new sk_buff with more tailroom */
 			ns = dev_alloc_skb(skb->len + 128);
-			if (ns == 0) {
+			if (!ns) {
 				printk(KERN_ERR"PPP: no memory (VJ decomp)\n");
 				goto err;
 			}
@@ -1606,7 +1606,7 @@ ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb)
 		break;
 
 	case PPP_VJC_UNCOMP:
-		if (ppp->vj == 0 || (ppp->flags & SC_REJ_COMP_TCP))
+		if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP))
 			goto err;
 
 		/* Until we fix the decompressor need to make sure
@@ -1636,7 +1636,7 @@ ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb)
 		skb_queue_tail(&ppp->file.rq, skb);
 		/* limit queue length by dropping old frames */
 		while (ppp->file.rq.qlen > PPP_MAX_RQLEN
-		       && (skb = skb_dequeue(&ppp->file.rq)) != 0)
+		       && (skb = skb_dequeue(&ppp->file.rq)))
 			kfree_skb(skb);
 		/* wake up any process polling or blocking on read */
 		wake_up_interruptible(&ppp->file.rwait);
@@ -1718,7 +1718,7 @@ ppp_decompress_frame(struct ppp *ppp, struct sk_buff *skb)
 		}
 
 		ns = dev_alloc_skb(obuff_size);
-		if (ns == 0) {
+		if (!ns) {
 			printk(KERN_ERR "ppp_decompress_frame: no memory\n");
 			goto err;
 		}
@@ -1836,7 +1836,7 @@ ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
 		ppp->minseq = ppp->mrq.next->sequence;
 
 	/* Pull completed packets off the queue and receive them. */
-	while ((skb = ppp_mp_reconstruct(ppp)) != 0)
+	while ((skb = ppp_mp_reconstruct(ppp)))
 		ppp_receive_nonmp_frame(ppp, skb);
 
 	return;
@@ -2002,7 +2002,7 @@ ppp_register_channel(struct ppp_channel *chan)
 	struct channel *pch;
 
 	pch = kzalloc(sizeof(struct channel), GFP_KERNEL);
-	if (pch == 0)
+	if (!pch)
 		return -ENOMEM;
 	pch->ppp = NULL;
 	pch->chan = chan;
@@ -2030,7 +2030,7 @@ int ppp_channel_index(struct ppp_channel *chan)
 {
 	struct channel *pch = chan->ppp;
 
-	if (pch != 0)
+	if (pch)
 		return pch->file.index;
 	return -1;
 }
@@ -2043,9 +2043,9 @@ int ppp_unit_number(struct ppp_channel *chan)
 	struct channel *pch = chan->ppp;
 	int unit = -1;
 
-	if (pch != 0) {
+	if (pch) {
 		read_lock_bh(&pch->upl);
-		if (pch->ppp != 0)
+		if (pch->ppp)
 			unit = pch->ppp->file.index;
 		read_unlock_bh(&pch->upl);
 	}
@@ -2061,7 +2061,7 @@ ppp_unregister_channel(struct ppp_channel *chan)
 {
 	struct channel *pch = chan->ppp;
 
-	if (pch == 0)
+	if (!pch)
 		return;		/* should never happen */
 	chan->ppp = NULL;
 
@@ -2093,7 +2093,7 @@ ppp_output_wakeup(struct ppp_channel *chan)
 {
 	struct channel *pch = chan->ppp;
 
-	if (pch == 0)
+	if (!pch)
 		return;
 	ppp_channel_push(pch);
 }
@@ -2124,18 +2124,18 @@ ppp_set_compress(struct ppp *ppp, unsigned long arg)
 
 	cp = find_compressor(ccp_option[0]);
 #ifdef CONFIG_KMOD
-	if (cp == 0) {
+	if (!cp) {
 		request_module("ppp-compress-%d", ccp_option[0]);
 		cp = find_compressor(ccp_option[0]);
 	}
 #endif /* CONFIG_KMOD */
-	if (cp == 0)
+	if (!cp)
 		goto out;
 
 	err = -ENOBUFS;
 	if (data.transmit) {
 		state = cp->comp_alloc(ccp_option, data.length);
-		if (state != 0) {
+		if (state) {
 			ppp_xmit_lock(ppp);
 			ppp->xstate &= ~SC_COMP_RUN;
 			ocomp = ppp->xcomp;
@@ -2143,7 +2143,7 @@ ppp_set_compress(struct ppp *ppp, unsigned long arg)
 			ppp->xcomp = cp;
 			ppp->xc_state = state;
 			ppp_xmit_unlock(ppp);
-			if (ostate != 0) {
+			if (ostate) {
 				ocomp->comp_free(ostate);
 				module_put(ocomp->owner);
 			}
@@ -2153,7 +2153,7 @@ ppp_set_compress(struct ppp *ppp, unsigned long arg)
 
 	} else {
 		state = cp->decomp_alloc(ccp_option, data.length);
-		if (state != 0) {
+		if (state) {
 			ppp_recv_lock(ppp);
 			ppp->rstate &= ~SC_DECOMP_RUN;
 			ocomp = ppp->rcomp;
@@ -2161,7 +2161,7 @@ ppp_set_compress(struct ppp *ppp, unsigned long arg)
 			ppp->rcomp = cp;
 			ppp->rc_state = state;
 			ppp_recv_unlock(ppp);
-			if (ostate != 0) {
+			if (ostate) {
 				ocomp->decomp_free(ostate);
 				module_put(ocomp->owner);
 			}
@@ -2228,7 +2228,7 @@ ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound)
 			break;
 		if (inbound) {
 			/* we will start receiving compressed packets */
-			if (ppp->rc_state == 0)
+			if (!ppp->rc_state)
 				break;
 			if (ppp->rcomp->decomp_init(ppp->rc_state, dp, len,
 					ppp->file.index, 0, ppp->mru, ppp->debug)) {
@@ -2237,7 +2237,7 @@ ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound)
 			}
 		} else {
 			/* we will soon start sending compressed packets */
-			if (ppp->xc_state == 0)
+			if (!ppp->xc_state)
 				break;
 			if (ppp->xcomp->comp_init(ppp->xc_state, dp, len,
 					ppp->file.index, 0, ppp->debug))
@@ -2320,11 +2320,11 @@ ppp_register_compressor(struct compressor *cp)
 	int ret;
 	spin_lock(&compressor_list_lock);
 	ret = -EEXIST;
-	if (find_comp_entry(cp->compress_proto) != 0)
+	if (find_comp_entry(cp->compress_proto))
 		goto out;
 	ret = -ENOMEM;
 	ce = kmalloc(sizeof(struct compressor_entry), GFP_ATOMIC);
-	if (ce == 0)
+	if (!ce)
 		goto out;
 	ret = 0;
 	ce->comp = cp;
@@ -2342,7 +2342,7 @@ ppp_unregister_compressor(struct compressor *cp)
 
 	spin_lock(&compressor_list_lock);
 	ce = find_comp_entry(cp->compress_proto);
-	if (ce != 0 && ce->comp == cp) {
+	if (ce && ce->comp == cp) {
 		list_del(&ce->list);
 		kfree(ce);
 	}
@@ -2358,7 +2358,7 @@ find_compressor(int type)
 
 	spin_lock(&compressor_list_lock);
 	ce = find_comp_entry(type);
-	if (ce != 0) {
+	if (ce) {
 		cp = ce->comp;
 		if (!try_module_get(cp->owner))
 			cp = NULL;
@@ -2383,7 +2383,7 @@ ppp_get_stats(struct ppp *ppp, struct ppp_stats *st)
 	st->p.ppp_opackets = ppp->stats.tx_packets;
 	st->p.ppp_oerrors = ppp->stats.tx_errors;
 	st->p.ppp_obytes = ppp->stats.tx_bytes;
-	if (vj == 0)
+	if (!vj)
 		return;
 	st->vj.vjs_packets = vj->sls_o_compressed + vj->sls_o_uncompressed;
 	st->vj.vjs_compressed = vj->sls_o_compressed;
@@ -2604,11 +2604,11 @@ ppp_connect_channel(struct channel *pch, int unit)
 
 	mutex_lock(&all_ppp_mutex);
 	ppp = ppp_find_unit(unit);
-	if (ppp == 0)
+	if (!ppp)
 		goto out;
 	write_lock_bh(&pch->upl);
 	ret = -EINVAL;
-	if (pch->ppp != 0)
+	if (pch->ppp)
 		goto outl;
 
 	ppp_lock(ppp);
@@ -2644,7 +2644,7 @@ ppp_disconnect_channel(struct channel *pch)
 	ppp = pch->ppp;
 	pch->ppp = NULL;
 	write_unlock_bh(&pch->upl);
-	if (ppp != 0) {
+	if (ppp) {
 		/* remove it from the ppp unit's list */
 		ppp_lock(ppp);
 		list_del(&pch->clist);
diff --git a/drivers/net/ppp_synctty.c b/drivers/net/ppp_synctty.c
index 00e2fb4..f0c6a19 100644
--- a/drivers/net/ppp_synctty.c
+++ b/drivers/net/ppp_synctty.c
@@ -209,7 +209,7 @@ ppp_sync_open(struct tty_struct *tty)
 
 	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
 	err = -ENOMEM;
-	if (ap == 0)
+	if (!ap)
 		goto out;
 
 	/* initialize the syncppp structure */
@@ -262,7 +262,7 @@ ppp_sync_close(struct tty_struct *tty)
 	ap = tty->disc_data;
 	tty->disc_data = NULL;
 	write_unlock_irq(&disc_data_lock);
-	if (ap == 0)
+	if (!ap)
 		return;
 
 	/*
@@ -278,7 +278,7 @@ ppp_sync_close(struct tty_struct *tty)
 
 	ppp_unregister_channel(&ap->chan);
 	skb_queue_purge(&ap->rqueue);
-	if (ap->tpkt != 0)
+	if (ap->tpkt)
 		kfree_skb(ap->tpkt);
 	kfree(ap);
 }
@@ -325,13 +325,13 @@ ppp_synctty_ioctl(struct tty_struct *tty, struct file *file,
 	int __user *p = (int __user *)arg;
 	int err, val;
 
-	if (ap == 0)
+	if (!ap)
 		return -ENXIO;
 	err = -EFAULT;
 	switch (cmd) {
 	case PPPIOCGCHAN:
 		err = -ENXIO;
-		if (ap == 0)
+		if (!ap)
 			break;
 		err = -EFAULT;
 		if (put_user(ppp_channel_index(&ap->chan), p))
@@ -341,7 +341,7 @@ ppp_synctty_ioctl(struct tty_struct *tty, struct file *file,
 
 	case PPPIOCGUNIT:
 		err = -ENXIO;
-		if (ap == 0)
+		if (!ap)
 			break;
 		err = -EFAULT;
 		if (put_user(ppp_unit_number(&ap->chan), p))
@@ -390,7 +390,7 @@ ppp_sync_receive(struct tty_struct *tty, const unsigned char *buf,
 	struct syncppp *ap = sp_get(tty);
 	unsigned long flags;
 
-	if (ap == 0)
+	if (!ap)
 		return;
 	spin_lock_irqsave(&ap->recv_lock, flags);
 	ppp_sync_input(ap, buf, cflags, count);
@@ -409,7 +409,7 @@ ppp_sync_wakeup(struct tty_struct *tty)
 	struct syncppp *ap = sp_get(tty);
 
 	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
-	if (ap == 0)
+	if (!ap)
 		return;
 	set_bit(XMIT_WAKEUP, &ap->xmit_flags);
 	tasklet_schedule(&ap->tsk);
@@ -651,7 +651,7 @@ ppp_sync_push(struct syncppp *ap)
 	for (;;) {
 		if (test_and_clear_bit(XMIT_WAKEUP, &ap->xmit_flags))
 			tty_stuffed = 0;
-		if (!tty_stuffed && ap->tpkt != 0) {
+		if (!tty_stuffed && ap->tpkt) {
 			set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 			sent = tty->driver->write(tty, ap->tpkt->data, ap->tpkt->len);
 			if (sent < 0)
@@ -669,7 +669,7 @@ ppp_sync_push(struct syncppp *ap)
 		/* haven't made any progress */
 		spin_unlock_bh(&ap->xmit_lock);
 		if (!(test_bit(XMIT_WAKEUP, &ap->xmit_flags)
-		      || (!tty_stuffed && ap->tpkt != 0)))
+		      || (!tty_stuffed && ap->tpkt)))
 			break;
 		if (!spin_trylock_bh(&ap->xmit_lock))
 			break;
@@ -677,7 +677,7 @@ ppp_sync_push(struct syncppp *ap)
 	return done;
 
 flush:
-	if (ap->tpkt != 0) {
+	if (ap->tpkt) {
 		kfree_skb(ap->tpkt);
 		ap->tpkt = NULL;
 		clear_bit(XMIT_FULL, &ap->xmit_flags);
@@ -732,7 +732,8 @@ ppp_sync_input(struct syncppp *ap, const unsigned char *buf,
 		ppp_print_buffer ("receive buffer", buf, count);
 
 	/* stuff the chars in the skb */
-	if ((skb = dev_alloc_skb(ap->mru + PPP_HDRLEN + 2)) == 0) {
+	skb = dev_alloc_skb(ap->mru + PPP_HDRLEN + 2);
+	if (!skb) {
 		printk(KERN_ERR "PPPsync: no memory (input pkt)\n");
 		goto err;
 	}
@@ -740,7 +741,7 @@ ppp_sync_input(struct syncppp *ap, const unsigned char *buf,
 	if (buf[0] != PPP_ALLSTATIONS)
 		skb_reserve(skb, 2 + (buf[0] & 1));
 
-	if (flags != 0 && *flags) {
+	if (flags && *flags) {
 		/* error flag set, ignore frame */
 		goto err;
 	} else if (count > skb_tailroom(skb)) {


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