[netdrvr] Trim trailing whitespace for several drivers
[linux-2.6.git] / drivers / net / ppp_generic.c
index 7e21342..d3207c0 100644 (file)
@@ -123,7 +123,6 @@ struct ppp {
        u32             minseq;         /* MP: min of most recent seqnos */
        struct sk_buff_head mrq;        /* MP: receive reconstruction queue */
 #endif /* CONFIG_PPP_MULTILINK */
-       struct net_device_stats stats;  /* statistics */
 #ifdef CONFIG_PPP_FILTER
        struct sock_filter *pass_filter;        /* filter for packets to pass */
        struct sock_filter *active_filter;/* filter for pkts to reset idle */
@@ -367,7 +366,7 @@ 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 +397,7 @@ 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 +430,7 @@ 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 +454,11 @@ 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 +490,11 @@ 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 +558,7 @@ 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 +688,13 @@ 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 +785,7 @@ 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 +802,7 @@ 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 +816,7 @@ 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;
@@ -914,18 +913,10 @@ ppp_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
  outf:
        kfree_skb(skb);
-       ++ppp->stats.tx_dropped;
+       ++ppp->dev->stats.tx_dropped;
        return 0;
 }
 
-static struct net_device_stats *
-ppp_net_stats(struct net_device *dev)
-{
-       struct ppp *ppp = (struct ppp *) dev->priv;
-
-       return &ppp->stats;
-}
-
 static int
 ppp_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 {
@@ -946,9 +937,9 @@ 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 +984,14 @@ 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);
@@ -1095,17 +1086,17 @@ ppp_send_frame(struct ppp *ppp, struct sk_buff *skb)
 #endif /* CONFIG_PPP_FILTER */
        }
 
-       ++ppp->stats.tx_packets;
-       ppp->stats.tx_bytes += skb->len - 2;
+       ++ppp->dev->stats.tx_packets;
+       ppp->dev->stats.tx_bytes += skb->len - 2;
 
        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 +1131,7 @@ 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())
@@ -1171,7 +1162,7 @@ ppp_send_frame(struct ppp *ppp, struct sk_buff *skb)
  drop:
        if (skb)
                kfree_skb(skb);
-       ++ppp->stats.tx_errors;
+       ++ppp->dev->stats.tx_errors;
 }
 
 /*
@@ -1185,7 +1176,7 @@ 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 +1346,7 @@ 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);
 
@@ -1409,7 +1400,7 @@ static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
        spin_unlock_bh(&pch->downl);
        if (ppp->debug & 1)
                printk(KERN_ERR "PPP: no memory (fragment)\n");
-       ++ppp->stats.tx_errors;
+       ++ppp->dev->stats.tx_errors;
        ++ppp->nxseq;
        return 1;       /* abandon the frame */
 }
@@ -1425,7 +1416,7 @@ 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 +1434,7 @@ 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 +1453,7 @@ 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 +1466,19 @@ 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 +1494,13 @@ 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);
@@ -1525,7 +1516,7 @@ ppp_input_error(struct ppp_channel *chan, int code)
 static void
 ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
 {
-       if (skb->len >= 2) {
+       if (pskb_may_pull(skb, 2)) {
 #ifdef CONFIG_PPP_MULTILINK
                /* XXX do channel-level decompression here */
                if (PPP_PROTO(skb) == PPP_MP)
@@ -1538,7 +1529,7 @@ ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
 
        if (skb->len > 0)
                /* note: a 0-length skb is used as an error indication */
-               ++ppp->stats.rx_length_errors;
+               ++ppp->dev->stats.rx_length_errors;
 
        kfree_skb(skb);
        ppp_receive_error(ppp);
@@ -1547,8 +1538,8 @@ ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
 static void
 ppp_receive_error(struct ppp *ppp)
 {
-       ++ppp->stats.rx_errors;
-       if (ppp->vj != 0)
+       ++ppp->dev->stats.rx_errors;
+       if (ppp->vj)
                slhc_toss(ppp->vj);
 }
 
@@ -1563,7 +1554,7 @@ 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 +1565,13 @@ 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) {
+               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 +1597,7 @@ 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
@@ -1627,8 +1618,8 @@ ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb)
                break;
        }
 
-       ++ppp->stats.rx_packets;
-       ppp->stats.rx_bytes += skb->len - 2;
+       ++ppp->dev->stats.rx_packets;
+       ppp->dev->stats.rx_bytes += skb->len - 2;
 
        npi = proto_to_npindex(proto);
        if (npi < 0) {
@@ -1636,7 +1627,7 @@ 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);
@@ -1648,23 +1639,29 @@ ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb)
                /* check if the packet passes the pass and active filters */
                /* the filter instructions are constructed assuming
                   a four-byte PPP header on each packet */
-               *skb_push(skb, 2) = 0;
-               if (ppp->pass_filter
-                   && sk_run_filter(skb, ppp->pass_filter,
-                                    ppp->pass_len) == 0) {
-                       if (ppp->debug & 1)
-                               printk(KERN_DEBUG "PPP: inbound frame not passed\n");
-                       kfree_skb(skb);
-                       return;
-               }
-               if (!(ppp->active_filter
-                     && sk_run_filter(skb, ppp->active_filter,
-                                      ppp->active_len) == 0))
-                       ppp->last_recv = jiffies;
-               skb_pull(skb, 2);
-#else
-               ppp->last_recv = jiffies;
+               if (ppp->pass_filter || ppp->active_filter) {
+                       if (skb_cloned(skb) &&
+                           pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+                               goto err;
+
+                       *skb_push(skb, 2) = 0;
+                       if (ppp->pass_filter
+                           && sk_run_filter(skb, ppp->pass_filter,
+                                            ppp->pass_len) == 0) {
+                               if (ppp->debug & 1)
+                                       printk(KERN_DEBUG "PPP: inbound frame "
+                                              "not passed\n");
+                               kfree_skb(skb);
+                               return;
+                       }
+                       if (!(ppp->active_filter
+                             && sk_run_filter(skb, ppp->active_filter,
+                                              ppp->active_len) == 0))
+                               ppp->last_recv = jiffies;
+                       __skb_pull(skb, 2);
+               } else
 #endif /* CONFIG_PPP_FILTER */
+                       ppp->last_recv = jiffies;
 
                if ((ppp->dev->flags & IFF_UP) == 0
                    || ppp->npmode[npi] != NPMODE_PASS) {
@@ -1712,7 +1709,7 @@ 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;
                }
@@ -1762,7 +1759,7 @@ ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
        struct channel *ch;
        int mphdrlen = (ppp->flags & SC_MP_SHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN;
 
-       if (!pskb_may_pull(skb, mphdrlen) || ppp->mrru == 0)
+       if (!pskb_may_pull(skb, mphdrlen + 1) || ppp->mrru == 0)
                goto err;               /* no good, throw it away */
 
        /* Decode sequence number and begin/end bits */
@@ -1800,7 +1797,7 @@ ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
         */
        if (seq_before(seq, ppp->nextseq)) {
                kfree_skb(skb);
-               ++ppp->stats.rx_dropped;
+               ++ppp->dev->stats.rx_dropped;
                ppp_receive_error(ppp);
                return;
        }
@@ -1830,7 +1827,7 @@ 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;
@@ -1865,7 +1862,7 @@ ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb)
  * complete packet, or we get to the sequence number for a fragment
  * which hasn't arrived but might still do so.
  */
-struct sk_buff *
+static struct sk_buff *
 ppp_mp_reconstruct(struct ppp *ppp)
 {
        u32 seq = ppp->nextseq;
@@ -1922,7 +1919,7 @@ ppp_mp_reconstruct(struct ppp *ppp)
                /* Got a complete packet yet? */
                if (lost == 0 && (p->BEbits & E) && (head->BEbits & B)) {
                        if (len > ppp->mrru + 2) {
-                               ++ppp->stats.rx_length_errors;
+                               ++ppp->dev->stats.rx_length_errors;
                                printk(KERN_DEBUG "PPP: reconstructed packet"
                                       " is too long (%d)\n", len);
                        } else if (p == head) {
@@ -1931,7 +1928,7 @@ ppp_mp_reconstruct(struct ppp *ppp)
                                skb = skb_get(p);
                                break;
                        } else if ((skb = dev_alloc_skb(len)) == NULL) {
-                               ++ppp->stats.rx_missed_errors;
+                               ++ppp->dev->stats.rx_missed_errors;
                                printk(KERN_DEBUG "PPP: no memory for "
                                       "reconstructed packet");
                        } else {
@@ -1960,7 +1957,7 @@ ppp_mp_reconstruct(struct ppp *ppp)
                        if (ppp->debug & 1)
                                printk(KERN_DEBUG "  missed pkts %u..%u\n",
                                       ppp->nextseq, head->sequence-1);
-                       ++ppp->stats.rx_dropped;
+                       ++ppp->dev->stats.rx_dropped;
                        ppp_receive_error(ppp);
                }
 
@@ -1996,7 +1993,7 @@ 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;
@@ -2024,7 +2021,7 @@ int ppp_channel_index(struct ppp_channel *chan)
 {
        struct channel *pch = chan->ppp;
 
-       if (pch != 0)
+       if (pch)
                return pch->file.index;
        return -1;
 }
@@ -2037,9 +2034,9 @@ 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);
        }
@@ -2055,7 +2052,7 @@ ppp_unregister_channel(struct ppp_channel *chan)
 {
        struct channel *pch = chan->ppp;
 
-       if (pch == 0)
+       if (!pch)
                return;         /* should never happen */
        chan->ppp = NULL;
 
@@ -2087,7 +2084,7 @@ ppp_output_wakeup(struct ppp_channel *chan)
 {
        struct channel *pch = chan->ppp;
 
-       if (pch == 0)
+       if (!pch)
                return;
        ppp_channel_push(pch);
 }
@@ -2118,18 +2115,18 @@ 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;
@@ -2137,7 +2134,7 @@ 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);
                        }
@@ -2147,7 +2144,7 @@ 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;
@@ -2155,7 +2152,7 @@ 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);
                        }
@@ -2222,7 +2219,7 @@ 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)) {
@@ -2231,7 +2228,7 @@ 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))
@@ -2314,11 +2311,11 @@ 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;
@@ -2336,7 +2333,7 @@ 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);
        }
@@ -2352,7 +2349,7 @@ 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;
@@ -2371,13 +2368,13 @@ ppp_get_stats(struct ppp *ppp, struct ppp_stats *st)
        struct slcompress *vj = ppp->vj;
 
        memset(st, 0, sizeof(*st));
-       st->p.ppp_ipackets = ppp->stats.rx_packets;
-       st->p.ppp_ierrors = ppp->stats.rx_errors;
-       st->p.ppp_ibytes = ppp->stats.rx_bytes;
-       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)
+       st->p.ppp_ipackets = ppp->dev->stats.rx_packets;
+       st->p.ppp_ierrors = ppp->dev->stats.rx_errors;
+       st->p.ppp_ibytes = ppp->dev->stats.rx_bytes;
+       st->p.ppp_opackets = ppp->dev->stats.tx_packets;
+       st->p.ppp_oerrors = ppp->dev->stats.tx_errors;
+       st->p.ppp_obytes = ppp->dev->stats.tx_bytes;
+       if (!vj)
                return;
        st->vj.vjs_packets = vj->sls_o_compressed + vj->sls_o_uncompressed;
        st->vj.vjs_compressed = vj->sls_o_compressed;
@@ -2430,7 +2427,6 @@ ppp_create_interface(int unit, int *retp)
        dev->priv = ppp;
 
        dev->hard_start_xmit = ppp_start_xmit;
-       dev->get_stats = ppp_net_stats;
        dev->do_ioctl = ppp_net_ioctl;
 
        ret = -EEXIST;
@@ -2598,11 +2594,11 @@ 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);
@@ -2638,7 +2634,7 @@ 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);