linux-kernel - [PATCH] net: ipv4: Use BUG_ON directly instead of a if condition followed by BUG

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Date:   Mon, 10 Sep 2018 22:38:02 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>
CC:     <kuznet@....inr.ac.ru>, <yoshfuji@...ux-ipv6.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] net: ipv4: Use BUG_ON directly instead of a if condition followed by BUG

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@...wei.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..893bde3 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(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(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