[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>

6 files changed, 10 insertions, 11 deletions

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index ad500a4..2b6e59c 100644
--- a/net/ipv4/igmp.c
+++ b/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;
diff --git a/net/ipv4/inet_lro.c b/net/ipv4/inet_lro.c
index 20bc593..4545b64 100644
--- a/net/ipv4/inet_lro.c
+++ b/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))
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index b2b3053..f51f20e 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/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;
 		}
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 9dee70e..e5b05b0 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -144,7 +144,7 @@ static struct {
 	{ "TimestampReps", ICMP_TIMESTAMPREPLY },
 	{ "AddrMasks", ICMP_ADDRESS },
 	{ "AddrMaskReps", ICMP_ADDRESSREPLY },
-	{ 0, 0 }
+	{ NULL, 0 }
 };
 
 
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 2a9b363..307e1f1 100644
--- a/net/ipv4/route.c
+++ b/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) {
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4268cd1..e8c3948 100644
--- a/net/ipv4/tcp_input.c
+++ b/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);