Re: [PATCH net-next] net: remove unnecessary NULL checking in napi_consume_skb()

[David Miller]

From: Yunsheng Lin 
Date: Sat, 19 Sep 2020 10:24:47 +0800

> 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 

Applied.

[PATCH net-next] net: remove unnecessary NULL checking in napi_consume_skb()

[Yunsheng Lin]

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 
---
 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