[PATCHv2] net: ipv4: Use BUG_ON directly instead of a if condition followed by BUG

From: zhong jiang <zhongjiang@huawei.com>
To: <davem@davemloft.net>, <edumazet@google.com>
Cc: <kuznet@ms2.inr.ac.ru>, <netdev@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>
Subject: [PATCHv2] net: ipv4: Use BUG_ON directly instead of a if condition followed by BUG
Date: Tue, 11 Sep 2018 21:13:13 +0800	[thread overview]
Message-ID: <1536671593-14746-1-git-send-email-zhongjiang@huawei.com> (raw)

The if condition can be removed if we use BUG_ON directly.
The issule is detected with the help of Coccinelle.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
---
 net/ipv4/tcp_input.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 62508a2..526c05e 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4934,8 +4934,8 @@ void tcp_rbtree_insert(struct rb_root *root, struct sk_buff *skb)
 			BUG_ON(offset < 0);
 			if (size > 0) {
 				size = min(copy, size);
-				if (skb_copy_bits(skb, offset, skb_put(nskb, size), size))
-					BUG();
+				BUG_ON(skb_copy_bits(skb, offset,
+						     skb_put(nskb, size), size));
 				TCP_SKB_CB(nskb)->end_seq += size;
 				copy -= size;
 				start += size;
@@ -5327,8 +5327,8 @@ static void tcp_urg(struct sock *sk, struct sk_buff *skb, const struct tcphdr *t
 		/* Is the urgent pointer pointing into this packet? */
 		if (ptr < skb->len) {
 			u8 tmp;
-			if (skb_copy_bits(skb, ptr, &tmp, 1))
-				BUG();
+
+			BUG_ON(skb_copy_bits(skb, ptr, &tmp, 1));
 			tp->urg_data = TCP_URG_VALID | tmp;
 			if (!sock_flag(sk, SOCK_DEAD))
 				sk->sk_data_ready(sk);
-- 
1.7.12.4

