[NET]: sparse warning fixes

Fix a bunch of sparse warnings. Mostly about 0 used as
NULL pointer, and shadowed variable declarations.
One notable case was that hash size should have been unsigned.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet_hashtables.h

@@ -107,7 +107,7 @@ struct inet_hashinfo {
 	 */
 	struct inet_bind_hashbucket	*bhash;
 
-	int				bhash_size;
+	unsigned int			bhash_size;
 	unsigned int			ehash_size;
 
 	/* All sockets in TCP_LISTEN state will be in here.  This is the only

include/net/sock.h

@@ -485,17 +485,17 @@ static inline void sk_add_backlog(struct sock *sk, struct sk_buff *skb)
 	skb->next = NULL;
 }
 
-#define sk_wait_event(__sk, __timeo, __condition)		\
-({	int rc;							\
-	release_sock(__sk);					\
-	rc = __condition;					\
-	if (!rc) {						\
-		*(__timeo) = schedule_timeout(*(__timeo));	\
-	}							\
-	lock_sock(__sk);					\
-	rc = __condition;					\
-	rc;							\
-})
+#define sk_wait_event(__sk, __timeo, __condition)			\
+	({	int __rc;						\
+		release_sock(__sk);					\
+		__rc = __condition;					\
+		if (!__rc) {						\
+			*(__timeo) = schedule_timeout(*(__timeo));	\
+		}							\
+		lock_sock(__sk);					\
+		__rc = __condition;					\
+		__rc;							\
+	})
 
 extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p);
 extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p);

net/appletalk/aarp.c

@@ -822,8 +822,6 @@ static int aarp_rcv(struct sk_buff *skb, struct net_device *dev,
 				 * address. So as a precaution flush any
 				 * entries we have for this address.
 				 */
-				struct aarp_entry *a;
-
 				a = __aarp_find_entry(resolved[sa.s_node %
 							  (AARP_HASH_SIZE - 1)],
 						      skb->dev, &sa);

net/atm/signaling.c

@@ -230,7 +230,7 @@ static void sigd_close(struct atm_vcc *vcc)
 		struct hlist_head *head = &vcc_hash[i];
 
 		sk_for_each(s, node, head) {
-			struct atm_vcc *vcc = atm_sk(s);
+			vcc = atm_sk(s);
 
 			purge_vcc(vcc);
 		}

net/core/dev.c

@@ -780,7 +780,7 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
 	int i = 0;
 	const char *p;
 	const int max_netdevices = 8*PAGE_SIZE;
-	long *inuse;
+	unsigned long *inuse;
 	struct net_device *d;
 
 	p = strnchr(name, IFNAMSIZ-1, '%');
@@ -794,7 +794,7 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
 			return -EINVAL;
 
 		/* Use one page as a bit array of possible slots */
-		inuse = (long *) get_zeroed_page(GFP_ATOMIC);
+		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
 		if (!inuse)
 			return -ENOMEM;
 

net/core/pktgen.c

@@ -1563,15 +1563,17 @@ static ssize_t pktgen_if_write(struct file *file,
 	}
 
 	if (!strcmp(name, "mpls")) {
-		unsigned n, offset;
+		unsigned n, cnt;
+
 		len = get_labels(&user_buffer[i], pkt_dev);
-		if (len < 0) { return len; }
+		if (len < 0)
+			return len;
 		i += len;
-		offset = sprintf(pg_result, "OK: mpls=");
+		cnt = sprintf(pg_result, "OK: mpls=");
 		for (n = 0; n < pkt_dev->nr_labels; n++)
-			offset += sprintf(pg_result + offset,
-					  "%08x%s", ntohl(pkt_dev->labels[n]),
-					  n == pkt_dev->nr_labels-1 ? "" : ",");
+			cnt += sprintf(pg_result + cnt,
+				       "%08x%s", ntohl(pkt_dev->labels[n]),
+				       n == pkt_dev->nr_labels-1 ? "" : ",");
 
 		if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) {
 			pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
@@ -2731,6 +2733,7 @@ static unsigned int scan_ip6(const char *s, char ip[16])
 	unsigned int prefixlen = 0;
 	unsigned int suffixlen = 0;
 	__be32 tmp;
+	char *pos;
 
 	for (i = 0; i < 16; i++)
 		ip[i] = 0;
@@ -2745,12 +2748,9 @@ static unsigned int scan_ip6(const char *s, char ip[16])
 			}
 			s++;
 		}
-		{
-			char *tmp;
-			u = simple_strtoul(s, &tmp, 16);
-			i = tmp - s;
-		}
 
+		u = simple_strtoul(s, &pos, 16);
+		i = pos - s;
 		if (!i)
 			return 0;
 		if (prefixlen == 12 && s[i] == '.') {
@@ -2778,11 +2778,9 @@ static unsigned int scan_ip6(const char *s, char ip[16])
 			len++;
 		} else if (suffixlen != 0)
 			break;
-		{
-			char *tmp;
-			u = simple_strtol(s, &tmp, 16);
-			i = tmp - s;
-		}
+
+		u = simple_strtol(s, &pos, 16);
+		i = pos - s;
 		if (!i) {
 			if (*s)
 				len--;

net/core/scm.c

@@ -167,7 +167,8 @@ int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *p)
 
 int put_cmsg(struct msghdr * msg, int level, int type, int len, void *data)
 {
-	struct cmsghdr __user *cm = (struct cmsghdr __user *)msg->msg_control;
+	struct cmsghdr __user *cm
+		= (__force struct cmsghdr __user *)msg->msg_control;
 	struct cmsghdr cmhdr;
 	int cmlen = CMSG_LEN(len);
 	int err;
@@ -202,7 +203,8 @@ int put_cmsg(struct msghdr * msg, int level, int type, int len, void *data)
 
 void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
 {
-	struct cmsghdr __user *cm = (struct cmsghdr __user*)msg->msg_control;
+	struct cmsghdr __user *cm
+		= (__force struct cmsghdr __user*)msg->msg_control;
 
 	int fdmax = 0;
 	int fdnum = scm->fp->count;
@@ -222,7 +224,8 @@ void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
 	if (fdnum < fdmax)
 		fdmax = fdnum;
 
-	for (i=0, cmfptr=(int __user *)CMSG_DATA(cm); i<fdmax; i++, cmfptr++)
+	for (i=0, cmfptr=(__force int __user *)CMSG_DATA(cm); i<fdmax;
+	     i++, cmfptr++)
 	{
 		int new_fd;
 		err = security_file_receive(fp[i]);

net/ipv4/igmp.c

@@ -1695,8 +1695,8 @@ static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 			(void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
 	} else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
 #ifdef CONFIG_IP_MULTICAST
-		struct in_device *in_dev = pmc->interface;
 		struct ip_sf_list *psf;
+		in_dev = pmc->interface;
 #endif
 
 		/* filter mode change */
@@ -1799,7 +1799,7 @@ static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
 {
 	int err;
 
-	if (iml->sflist == 0) {
+	if (iml->sflist == NULL) {
 		/* any-source empty exclude case */
 		return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
 			iml->sfmode, 0, NULL, 0);
@@ -2167,7 +2167,6 @@ int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
 		return -EFAULT;
 	}
 	for (i=0; i<copycount; i++) {
-		struct sockaddr_in *psin;
 		struct sockaddr_storage ss;
 
 		psin = (struct sockaddr_in *)&ss;

net/ipv4/inet_lro.c

@@ -482,7 +482,7 @@ static struct sk_buff *__lro_proc_segment(struct net_lro_mgr *lro_mgr,
 
 		lro_init_desc(lro_desc, skb, iph, tcph, 0, NULL);
 		LRO_INC_STATS(lro_mgr, aggregated);
-		return 0;
+		return NULL;
 	}
 
 	if (lro_desc->tcp_next_seq != ntohl(tcph->seq))

net/ipv4/ip_sockglue.c

@@ -659,7 +659,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 			break;
 		}
 		msf = kmalloc(optlen, GFP_KERNEL);
-		if (msf == 0) {
+		if (!msf) {
 			err = -ENOBUFS;
 			break;
 		}
@@ -816,7 +816,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 			break;
 		}
 		gsf = kmalloc(optlen,GFP_KERNEL);
-		if (gsf == 0) {
+		if (!gsf) {
 			err = -ENOBUFS;
 			break;
 		}
@@ -836,7 +836,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 		}
 		msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
 		msf = kmalloc(msize,GFP_KERNEL);
-		if (msf == 0) {
+		if (!msf) {
 			err = -ENOBUFS;
 			goto mc_msf_out;
 		}

net/ipv4/proc.c

@@ -144,7 +144,7 @@ static struct {
 	{ "TimestampReps", ICMP_TIMESTAMPREPLY },
 	{ "AddrMasks", ICMP_ADDRESS },
 	{ "AddrMaskReps", ICMP_ADDRESSREPLY },
-	{ 0, 0 }
+	{ NULL, 0 }
 };
 
 

net/ipv4/route.c

@@ -246,7 +246,7 @@ static spinlock_t	*rt_hash_locks;
 
 static struct rt_hash_bucket 	*rt_hash_table;
 static unsigned			rt_hash_mask;
-static int			rt_hash_log;
+static unsigned int		rt_hash_log;
 static unsigned int		rt_hash_rnd;
 
 static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat);
@@ -593,7 +593,7 @@ static void rt_check_expire(struct work_struct *work)
 		i = (i + 1) & rt_hash_mask;
 		rthp = &rt_hash_table[i].chain;
 
-		if (*rthp == 0)
+		if (*rthp == NULL)
 			continue;
 		spin_lock_bh(rt_hash_lock_addr(i));
 		while ((rth = *rthp) != NULL) {

net/ipv4/tcp_input.c

@@ -2704,7 +2704,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, s32 *seq_rtt_p)
 	BUG_TRAP((int)tp->lost_out >= 0);
 	BUG_TRAP((int)tp->retrans_out >= 0);
 	if (!tp->packets_out && tcp_is_sack(tp)) {
-		const struct inet_connection_sock *icsk = inet_csk(sk);
+		icsk = inet_csk(sk);
 		if (tp->lost_out) {
 			printk(KERN_DEBUG "Leak l=%u %d\n",
 			       tp->lost_out, icsk->icsk_ca_state);

net/ipv6/anycast.c

@@ -414,7 +414,7 @@ static int ipv6_chk_acast_dev(struct net_device *dev, struct in6_addr *addr)
 				break;
 		read_unlock_bh(&idev->lock);
 		in6_dev_put(idev);
-		return aca != 0;
+		return aca != NULL;
 	}
 	return 0;
 }

net/ipv6/ipv6_sockglue.c

@@ -663,7 +663,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 			break;
 		}
 		gsf = kmalloc(optlen,GFP_KERNEL);
-		if (gsf == 0) {
+		if (!gsf) {
 			retv = -ENOBUFS;
 			break;
 		}

net/ipv6/mcast.c

@@ -1407,7 +1407,7 @@ static struct sk_buff *mld_newpack(struct net_device *dev, int size)
 	/* we assume size > sizeof(ra) here */
 	skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
 
-	if (skb == 0)
+	if (!skb)
 		return NULL;
 
 	skb_reserve(skb, LL_RESERVED_SPACE(dev));
@@ -2144,7 +2144,7 @@ static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 	/* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
 	 * so no other readers or writers of iml or its sflist
 	 */
-	if (iml->sflist == 0) {
+	if (!iml->sflist) {
 		/* any-source empty exclude case */
 		return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
 	}

net/ipv6/ndisc.c

@@ -256,7 +256,7 @@ static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
 			break;
 		case ND_OPT_PREFIX_INFO:
 			ndopts->nd_opts_pi_end = nd_opt;
-			if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0)
+			if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
 				ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
 			break;
 #ifdef CONFIG_IPV6_ROUTE_INFO

net/sched/cls_u32.c

@@ -592,7 +592,7 @@ static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 	} else
 		handle = gen_new_kid(ht, htid);
 
-	if (tb[TCA_U32_SEL-1] == 0 ||
+	if (tb[TCA_U32_SEL-1] == NULL ||
 	    RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
 		return -EINVAL;
 

net/socket.c

@@ -1929,7 +1929,7 @@ asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg,
 	 *      kernel msghdr to use the kernel address space)
 	 */
 
-	uaddr = (void __user *)msg_sys.msg_name;
+	uaddr = (__force void __user *)msg_sys.msg_name;
 	uaddr_len = COMPAT_NAMELEN(msg);
 	if (MSG_CMSG_COMPAT & flags) {
 		err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE);