netdev - Re: problem with function vlan_get

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Date:	Sun, 17 Jul 2011 16:15:51 +0800
From:	"jiangtao.jit" <jiangtao.jit@...il.com>
To:	"Francois Romieu" <romieu@...zoreil.com>
Cc:	"netdev" <netdev@...r.kernel.org>
Subject: Re: problem with function vlan_get_protocol()


Thanks a lot Francois
thank you for your explanation

--
jiangtao



发件人： Francois Romieu 
发送时间： 2011-07-17  15:49:00 
收件人： jiangtao.jit 
抄送： netdev 
主题： Re: problem with function vlan_get_protocol() 
 
jiangtao.jit <jiangtao.jit@...il.com> :
[...]
> do we need an else branch on pointer protop failed ?  through the else is unlikely 
> 
>  if (likely(protop))
>  protocol = *protop;
>     else
>  protocol = proto;
> 
> is it necessary ?
The else branch signals that skb_header_pointer uncloaked a really tiny
ethernet frame : the content of proto is not even initialized (stack
allocation), whence irrelevant. In such circumstances the default
initialization value of protocol (0) does not seem too bad.
-- 
Ueimor