igmp: fix new sparse errors

Fix following sparse errors :

net/ipv4/igmp.c:1222:25: warning: cast from restricted __be32
net/ipv4/igmp.c:1234:31: warning: incorrect type in assignment (different address spaces)
net/ipv4/igmp.c:1234:31:    expected struct ip_mc_list [noderef] <asn:4>*next_hash
net/ipv4/igmp.c:1234:31:    got struct ip_mc_list *<noident>
net/ipv4/igmp.c:1250:31: warning: incorrect type in assignment (different address spaces)
net/ipv4/igmp.c:1250:31:    expected struct ip_mc_list [noderef] <asn:4>*next_hash
net/ipv4/igmp.c:1250:31:    got struct ip_mc_list *<noident>
net/ipv4/igmp.c:2380:37: warning: cast from restricted __be32

These were added by commit e9897071350bd9
("igmp: hash a hash table to speedup ip_check_mc_rcu()")

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index a09190ddffba668bae1a3c4a4cb65f6d0ceb17e5..cd71190d29625c11fe25aa603026cc98e0e2c34b 100644 (file)
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1219,7 +1219,7 @@ static void igmp_group_added(struct ip_mc_list *im)
 
 static u32 ip_mc_hash(const struct ip_mc_list *im)
 {
-       return hash_32((u32)im->multiaddr, MC_HASH_SZ_LOG);
+       return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
 }
 
 static void ip_mc_hash_add(struct in_device *in_dev,
@@ -1231,7 +1231,7 @@ static void ip_mc_hash_add(struct in_device *in_dev,
        mc_hash = rtnl_dereference(in_dev->mc_hash);
        if (mc_hash) {
                hash = ip_mc_hash(im);
-               im->next_hash = rtnl_dereference(mc_hash[hash]);
+               im->next_hash = mc_hash[hash];
                rcu_assign_pointer(mc_hash[hash], im);
                return;
        }
@@ -1247,7 +1247,7 @@ static void ip_mc_hash_add(struct in_device *in_dev,
 
        for_each_pmc_rtnl(in_dev, im) {
                hash = ip_mc_hash(im);
-               im->next_hash = rtnl_dereference(mc_hash[hash]);
+               im->next_hash = mc_hash[hash];
                RCU_INIT_POINTER(mc_hash[hash], im);
        }
 
@@ -2377,7 +2377,7 @@ int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u
 
        mc_hash = rcu_dereference(in_dev->mc_hash);
        if (mc_hash) {
-               u32 hash = hash_32((u32)mc_addr, MC_HASH_SZ_LOG);
+               u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
 
                for (im = rcu_dereference(mc_hash[hash]);
                     im != NULL;