10 files changed, 19 insertions, 6 deletions

diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 7802b72196f3..37bb33fbc742 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -271,6 +271,7 @@ static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir)
                 case NEXTHDR_DEST:
                         if (dir == XFRM_POLICY_OUT)
                                 ipv6_rearrange_destopt(iph, exthdr.opth);
+                        /* fall through */
                 case NEXTHDR_HOP:
                         if (!zero_out_mutable_opts(exthdr.opth)) {
                                 net_dbg_ratelimited("overrun %sopts\n",
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index 95516138e861..7835dea930b4 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -89,6 +89,7 @@ static bool ip6_tlvopt_unknown(struct sk_buff *skb, int optoff)
                  */
                 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr))
                         break;
+                /* fall through */
         case 2: /* send ICMP PARM PROB regardless and drop packet */
                 icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff);
                 return false;
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 4e52d52a6752..6ae5dd3f4d0d 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -864,10 +864,8 @@ static int icmpv6_rcv(struct sk_buff *skb)
                         goto discard_it;
                 hdr = icmp6_hdr(skb);
 
-                /*
-                 *      Drop through to notify
-                 */
-
+                /* to notify */
+                /* fall through */
         case ICMPV6_DEST_UNREACH:
         case ICMPV6_TIME_EXCEED:
         case ICMPV6_PARAMPROB:
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 548af48212fc..1ada9672d198 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1780,6 +1780,7 @@ static int fib6_walk_continue(struct fib6_walker *w)
                         }
                         w->state = FWS_L;
 #endif
+                        /* fall through */
                 case FWS_L:
                         left = rcu_dereference_protected(fn->left, 1);
                         if (left) {
@@ -1788,6 +1789,7 @@ static int fib6_walk_continue(struct fib6_walker *w)
                                 continue;
                         }
                         w->state = FWS_R;
+                        /* fall through */
                 case FWS_R:
                         right = rcu_dereference_protected(fn->right, 1);
                         if (right) {
@@ -1797,6 +1799,7 @@ static int fib6_walk_continue(struct fib6_walker *w)
                         }
                         w->state = FWS_C;
                         w->leaf = rcu_dereference_protected(fn->leaf, 1);
+                        /* fall through */
                 case FWS_C:
                         if (w->leaf && fn->fn_flags & RTN_RTINFO) {
                                 int err;
@@ -1815,6 +1818,7 @@ static int fib6_walk_continue(struct fib6_walker *w)
                         }
 skip:
                         w->state = FWS_U;
+                        /* fall through */
                 case FWS_U:
                         if (fn == w->root)
                                 return 0;
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 825548680b1e..4212879ff35e 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -593,6 +593,7 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
         case NDISC_REDIRECT:
                 rel_type = ICMP_REDIRECT;
                 rel_code = ICMP_REDIR_HOST;
+                /* fall through */
         default:
                 return 0;
         }
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index f5500f5444e9..59fad81e5f7a 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1722,6 +1722,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
         case MRT6_ADD_MFC:
         case MRT6_DEL_MFC:
                 parent = -1;
+                /* fall through */
         case MRT6_ADD_MFC_PROXY:
         case MRT6_DEL_MFC_PROXY:
                 if (optlen < sizeof(mfc))
diff --git a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
index 46d6dba50698..1d2fb9267d6f 100644
--- a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
+++ b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
@@ -290,7 +290,8 @@ nf_nat_ipv6_fn(void *priv, struct sk_buff *skb,
                         else
                                 return NF_ACCEPT;
                 }
-                /* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
+                /* Only ICMPs can be IP_CT_IS_REPLY: */
+                /* fall through */
         case IP_CT_NEW:
                 /* Seen it before?  This can happen for loopback, retrans,
                  * or local packets.
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index e4462b0ff801..761a473a07c5 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -1055,6 +1055,7 @@ static int rawv6_setsockopt(struct sock *sk, int level, int optname,
                 if (optname == IPV6_CHECKSUM ||
                     optname == IPV6_HDRINCL)
                         break;
+                /* fall through */
         default:
                 return ipv6_setsockopt(sk, level, optname, optval, optlen);
         }
@@ -1077,6 +1078,7 @@ static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
                 if (optname == IPV6_CHECKSUM ||
                     optname == IPV6_HDRINCL)
                         break;
+                /* fall through */
         default:
                 return compat_ipv6_setsockopt(sk, level, optname,
                                               optval, optlen);
@@ -1138,6 +1140,7 @@ static int rawv6_getsockopt(struct sock *sk, int level, int optname,
                 if (optname == IPV6_CHECKSUM ||
                     optname == IPV6_HDRINCL)
                         break;
+                /* fall through */
         default:
                 return ipv6_getsockopt(sk, level, optname, optval, optlen);
         }
@@ -1160,6 +1163,7 @@ static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
                 if (optname == IPV6_CHECKSUM ||
                     optname == IPV6_HDRINCL)
                         break;
+                /* fall through */
         default:
                 return compat_ipv6_getsockopt(sk, level, optname,
                                               optval, optlen);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 64d94afa427f..ae83615b7f6d 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1577,8 +1577,9 @@ do_time_wait:
                         refcounted = false;
                         goto process;
                 }
-                /* Fall through to ACK */
         }
+                /* to ACK */
+                /* fall through */
         case TCP_TW_ACK:
                 tcp_v6_timewait_ack(sk, skb);
                 break;
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 11d1314ab6c5..4ed9f8cc3b6a 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -152,6 +152,7 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
                 switch (nexthdr) {
                 case NEXTHDR_FRAGMENT:
                         onlyproto = 1;
+                        /* fall through */
                 case NEXTHDR_ROUTING:
                 case NEXTHDR_HOP:
                 case NEXTHDR_DEST: