net: convert BUG_TRAP to generic WARN_ON

Removes legacy reinvent-the-wheel type thing. The generic
machinery integrates much better to automated debugging aids
such as kerneloops.org (and others), and is unambiguous due to
better naming. Non-intuively BUG_TRAP() is actually equal to
WARN_ON() rather than BUG_ON() though some might actually be
promoted to BUG_ON() but I left that to future.

I could make at least one BUILD_BUG_ON conversion.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 47 insertions, 47 deletions

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index dd919d8..a107f49 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -148,10 +148,10 @@ void inet_sock_destruct(struct sock *sk)
 		return;
 	}
 
-	BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
-	BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
-	BUG_TRAP(!sk->sk_wmem_queued);
-	BUG_TRAP(!sk->sk_forward_alloc);
+	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
+	WARN_ON(atomic_read(&sk->sk_wmem_alloc));
+	WARN_ON(sk->sk_wmem_queued);
+	WARN_ON(sk->sk_forward_alloc);
 
 	kfree(inet->opt);
 	dst_release(sk->sk_dst_cache);
@@ -341,7 +341,7 @@ lookup_protocol:
 	answer_flags = answer->flags;
 	rcu_read_unlock();
 
-	BUG_TRAP(answer_prot->slab != NULL);
+	WARN_ON(answer_prot->slab == NULL);
 
 	err = -ENOBUFS;
 	sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
@@ -661,8 +661,8 @@ int inet_accept(struct socket *sock, struct socket *newsock, int flags)
 
 	lock_sock(sk2);
 
-	BUG_TRAP((1 << sk2->sk_state) &
-		 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE));
+	WARN_ON(!((1 << sk2->sk_state) &
+		  (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
 
 	sock_graft(sk2, newsock);
 
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 2e667e2..91d3d96 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -138,8 +138,8 @@ void in_dev_finish_destroy(struct in_device *idev)
 {
 	struct net_device *dev = idev->dev;
 
-	BUG_TRAP(!idev->ifa_list);
-	BUG_TRAP(!idev->mc_list);
+	WARN_ON(idev->ifa_list);
+	WARN_ON(idev->mc_list);
 #ifdef NET_REFCNT_DEBUG
 	printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
 	       idev, dev ? dev->name : "NIL");
@@ -399,7 +399,7 @@ static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
 	}
 	ipv4_devconf_setall(in_dev);
 	if (ifa->ifa_dev != in_dev) {
-		BUG_TRAP(!ifa->ifa_dev);
+		WARN_ON(ifa->ifa_dev);
 		in_dev_hold(in_dev);
 		ifa->ifa_dev = in_dev;
 	}
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index bb81c95..0c1ae68e 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -167,7 +167,7 @@ tb_not_found:
 success:
 	if (!inet_csk(sk)->icsk_bind_hash)
 		inet_bind_hash(sk, tb, snum);
-	BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb);
+	WARN_ON(inet_csk(sk)->icsk_bind_hash != tb);
 	ret = 0;
 
 fail_unlock:
@@ -260,7 +260,7 @@ struct sock *inet_csk_accept(struct sock *sk, int flags, int *err)
 	}
 
 	newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk);
-	BUG_TRAP(newsk->sk_state != TCP_SYN_RECV);
+	WARN_ON(newsk->sk_state == TCP_SYN_RECV);
 out:
 	release_sock(sk);
 	return newsk;
@@ -386,7 +386,7 @@ struct request_sock *inet_csk_search_req(const struct sock *sk,
 		    ireq->rmt_addr == raddr &&
 		    ireq->loc_addr == laddr &&
 		    AF_INET_FAMILY(req->rsk_ops->family)) {
-			BUG_TRAP(!req->sk);
+			WARN_ON(req->sk);
 			*prevp = prev;
 			break;
 		}
@@ -539,14 +539,14 @@ EXPORT_SYMBOL_GPL(inet_csk_clone);
  */
 void inet_csk_destroy_sock(struct sock *sk)
 {
-	BUG_TRAP(sk->sk_state == TCP_CLOSE);
-	BUG_TRAP(sock_flag(sk, SOCK_DEAD));
+	WARN_ON(sk->sk_state != TCP_CLOSE);
+	WARN_ON(!sock_flag(sk, SOCK_DEAD));
 
 	/* It cannot be in hash table! */
-	BUG_TRAP(sk_unhashed(sk));
+	WARN_ON(!sk_unhashed(sk));
 
 	/* If it has not 0 inet_sk(sk)->num, it must be bound */
-	BUG_TRAP(!inet_sk(sk)->num || inet_csk(sk)->icsk_bind_hash);
+	WARN_ON(inet_sk(sk)->num && !inet_csk(sk)->icsk_bind_hash);
 
 	sk->sk_prot->destroy(sk);
 
@@ -629,7 +629,7 @@ void inet_csk_listen_stop(struct sock *sk)
 
 		local_bh_disable();
 		bh_lock_sock(child);
-		BUG_TRAP(!sock_owned_by_user(child));
+		WARN_ON(sock_owned_by_user(child));
 		sock_hold(child);
 
 		sk->sk_prot->disconnect(child, O_NONBLOCK);
@@ -647,7 +647,7 @@ void inet_csk_listen_stop(struct sock *sk)
 		sk_acceptq_removed(sk);
 		__reqsk_free(req);
 	}
-	BUG_TRAP(!sk->sk_ack_backlog);
+	WARN_ON(sk->sk_ack_backlog);
 }
 
 EXPORT_SYMBOL_GPL(inet_csk_listen_stop);
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index 0546a0b..6c52e08 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -134,8 +134,8 @@ void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f,
 	struct sk_buff *fp;
 	struct netns_frags *nf;
 
-	BUG_TRAP(q->last_in & INET_FRAG_COMPLETE);
-	BUG_TRAP(del_timer(&q->timer) == 0);
+	WARN_ON(!(q->last_in & INET_FRAG_COMPLETE));
+	WARN_ON(del_timer(&q->timer) != 0);
 
 	/* Release all fragment data. */
 	fp = q->fragments;
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 115f537..4498190 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -305,7 +305,7 @@ unique:
 	inet->num = lport;
 	inet->sport = htons(lport);
 	sk->sk_hash = hash;
-	BUG_TRAP(sk_unhashed(sk));
+	WARN_ON(!sk_unhashed(sk));
 	__sk_add_node(sk, &head->chain);
 	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 	write_unlock(lock);
@@ -342,7 +342,7 @@ void __inet_hash_nolisten(struct sock *sk)
 	rwlock_t *lock;
 	struct inet_ehash_bucket *head;
 
-	BUG_TRAP(sk_unhashed(sk));
+	WARN_ON(!sk_unhashed(sk));
 
 	sk->sk_hash = inet_sk_ehashfn(sk);
 	head = inet_ehash_bucket(hashinfo, sk->sk_hash);
@@ -367,7 +367,7 @@ static void __inet_hash(struct sock *sk)
 		return;
 	}
 
-	BUG_TRAP(sk_unhashed(sk));
+	WARN_ON(!sk_unhashed(sk));
 	list = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
 	lock = &hashinfo->lhash_lock;
 
@@ -450,7 +450,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
 			 */
 			inet_bind_bucket_for_each(tb, node, &head->chain) {
 				if (tb->ib_net == net && tb->port == port) {
-					BUG_TRAP(!hlist_empty(&tb->owners));
+					WARN_ON(hlist_empty(&tb->owners));
 					if (tb->fastreuse >= 0)
 						goto next_port;
 					if (!check_established(death_row, sk,
diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index 75c2def..d985bd6 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -86,7 +86,7 @@ void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
 			hashinfo->bhash_size)];
 	spin_lock(&bhead->lock);
 	tw->tw_tb = icsk->icsk_bind_hash;
-	BUG_TRAP(icsk->icsk_bind_hash);
+	WARN_ON(!icsk->icsk_bind_hash);
 	inet_twsk_add_bind_node(tw, &tw->tw_tb->owners);
 	spin_unlock(&bhead->lock);
 
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 38d38f0..2152d22 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -488,8 +488,8 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
 		qp->q.fragments = head;
 	}
 
-	BUG_TRAP(head != NULL);
-	BUG_TRAP(FRAG_CB(head)->offset == 0);
+	WARN_ON(head == NULL);
+	WARN_ON(FRAG_CB(head)->offset != 0);
 
 	/* Allocate a new buffer for the datagram. */
 	ihlen = ip_hdrlen(head);
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 465544f..d533a89 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -118,7 +118,7 @@ static int ip_dev_loopback_xmit(struct sk_buff *newskb)
 	__skb_pull(newskb, skb_network_offset(newskb));
 	newskb->pkt_type = PACKET_LOOPBACK;
 	newskb->ip_summed = CHECKSUM_UNNECESSARY;
-	BUG_TRAP(newskb->dst);
+	WARN_ON(!newskb->dst);
 	netif_rx(newskb);
 	return 0;
 }
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 0b491bf..1ab341e 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1096,7 +1096,7 @@ void tcp_cleanup_rbuf(struct sock *sk, int copied)
 #if TCP_DEBUG
 	struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
 
-	BUG_TRAP(!skb || before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq));
+	WARN_ON(skb && !before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq));
 #endif
 
 	if (inet_csk_ack_scheduled(sk)) {
@@ -1358,7 +1358,7 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 				goto found_ok_skb;
 			if (tcp_hdr(skb)->fin)
 				goto found_fin_ok;
-			BUG_TRAP(flags & MSG_PEEK);
+			WARN_ON(!(flags & MSG_PEEK));
 			skb = skb->next;
 		} while (skb != (struct sk_buff *)&sk->sk_receive_queue);
 
@@ -1421,8 +1421,8 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 
 			tp->ucopy.len = len;
 
-			BUG_TRAP(tp->copied_seq == tp->rcv_nxt ||
-				 (flags & (MSG_PEEK | MSG_TRUNC)));
+			WARN_ON(tp->copied_seq != tp->rcv_nxt &&
+				!(flags & (MSG_PEEK | MSG_TRUNC)));
 
 			/* Ugly... If prequeue is not empty, we have to
 			 * process it before releasing socket, otherwise
@@ -1844,7 +1844,7 @@ adjudge_to_death:
 	 */
 	local_bh_disable();
 	bh_lock_sock(sk);
-	BUG_TRAP(!sock_owned_by_user(sk));
+	WARN_ON(sock_owned_by_user(sk));
 
 	/* Have we already been destroyed by a softirq or backlog? */
 	if (state != TCP_CLOSE && sk->sk_state == TCP_CLOSE)
@@ -1973,7 +1973,7 @@ int tcp_disconnect(struct sock *sk, int flags)
 	memset(&tp->rx_opt, 0, sizeof(tp->rx_opt));
 	__sk_dst_reset(sk);
 
-	BUG_TRAP(!inet->num || icsk->icsk_bind_hash);
+	WARN_ON(inet->num && !icsk->icsk_bind_hash);
 
 	sk->sk_error_report(sk);
 	return err;
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 75efd24..67ccce2 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1629,10 +1629,10 @@ advance_sp:
 out:
 
 #if FASTRETRANS_DEBUG > 0
-	BUG_TRAP((int)tp->sacked_out >= 0);
-	BUG_TRAP((int)tp->lost_out >= 0);
-	BUG_TRAP((int)tp->retrans_out >= 0);
-	BUG_TRAP((int)tcp_packets_in_flight(tp) >= 0);
+	WARN_ON((int)tp->sacked_out < 0);
+	WARN_ON((int)tp->lost_out < 0);
+	WARN_ON((int)tp->retrans_out < 0);
+	WARN_ON((int)tcp_packets_in_flight(tp) < 0);
 #endif
 	return flag;
 }
@@ -2181,7 +2181,7 @@ static void tcp_mark_head_lost(struct sock *sk, int packets)
 	int err;
 	unsigned int mss;
 
-	BUG_TRAP(packets <= tp->packets_out);
+	WARN_ON(packets > tp->packets_out);
 	if (tp->lost_skb_hint) {
 		skb = tp->lost_skb_hint;
 		cnt = tp->lost_cnt_hint;
@@ -2610,7 +2610,7 @@ static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked, int flag)
 	/* E. Check state exit conditions. State can be terminated
 	 *    when high_seq is ACKed. */
 	if (icsk->icsk_ca_state == TCP_CA_Open) {
-		BUG_TRAP(tp->retrans_out == 0);
+		WARN_ON(tp->retrans_out != 0);
 		tp->retrans_stamp = 0;
 	} else if (!before(tp->snd_una, tp->high_seq)) {
 		switch (icsk->icsk_ca_state) {
@@ -2972,9 +2972,9 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets)
 	}
 
 #if FASTRETRANS_DEBUG > 0
-	BUG_TRAP((int)tp->sacked_out >= 0);
-	BUG_TRAP((int)tp->lost_out >= 0);
-	BUG_TRAP((int)tp->retrans_out >= 0);
+	WARN_ON((int)tp->sacked_out < 0);
+	WARN_ON((int)tp->lost_out < 0);
+	WARN_ON((int)tp->retrans_out < 0);
 	if (!tp->packets_out && tcp_is_sack(tp)) {
 		icsk = inet_csk(sk);
 		if (tp->lost_out) {
@@ -3877,7 +3877,7 @@ static void tcp_sack_remove(struct tcp_sock *tp)
 			int i;
 
 			/* RCV.NXT must cover all the block! */
-			BUG_TRAP(!before(tp->rcv_nxt, sp->end_seq));
+			WARN_ON(before(tp->rcv_nxt, sp->end_seq));
 
 			/* Zap this SACK, by moving forward any other SACKS. */
 			for (i=this_sack+1; i < num_sacks; i++)
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index a82df63..a2b06d0 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -418,7 +418,7 @@ void tcp_v4_err(struct sk_buff *skb, u32 info)
 		/* ICMPs are not backlogged, hence we cannot get
 		   an established socket here.
 		 */
-		BUG_TRAP(!req->sk);
+		WARN_ON(req->sk);
 
 		if (seq != tcp_rsk(req)->snt_isn) {
 			NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 328e0cf..5ab6ba1 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -287,7 +287,7 @@ static void tcp_retransmit_timer(struct sock *sk)
 	if (!tp->packets_out)
 		goto out;
 
-	BUG_TRAP(!tcp_write_queue_empty(sk));
+	WARN_ON(tcp_write_queue_empty(sk));
 
 	if (!tp->snd_wnd && !sock_flag(sk, SOCK_DEAD) &&
 	    !((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))) {