linux-kernel - [PATCH net-next] net: remove unnecessary NULL checking in napi_consume

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Date:   Sat, 19 Sep 2020 10:24:47 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <linmiaohe@...wei.com>,
        <martin.varghese@...ia.com>, <fw@...len.de>, <edumazet@...gle.com>,
        <dcaratti@...hat.com>, <steffen.klassert@...unet.com>,
        <pabeni@...hat.com>, <kyk.segfault@...il.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>
Subject: [PATCH net-next] net: remove unnecessary NULL checking in napi_consume_skb()

When budget is non-zero, skb_unref() has already handled the
NULL checking.

When budget is zero, the dev_consume_skb_any() has handled NULL
checking in __dev_kfree_skb_irq(), or dev_kfree_skb() which also
ultimately call skb_unref().

So remove the unnecessary checking in napi_consume_skb().

Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
---
 net/core/skbuff.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index bfd7483..e077447 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -895,9 +895,6 @@ void __kfree_skb_defer(struct sk_buff *skb)
 
 void napi_consume_skb(struct sk_buff *skb, int budget)
 {
-	if (unlikely(!skb))
-		return;
-
 	/* Zero budget indicate non-NAPI context called us, like netpoll */
 	if (unlikely(!budget)) {
 		dev_consume_skb_any(skb);
-- 
2.8.1