linux-kernel - Re: [PATCH] net: mac80211: tx.c: be sure of 'sdata->vif.type' must be NL80211_IFTYPE_AP when be in NL80211_IFTYPE

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Message-ID: <529BD83B.4030103@gmail.com>
Date:	Mon, 02 Dec 2013 08:45:47 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Joe Perches <joe@...ches.com>
CC:	Johannes Berg <johannes@...solutions.net>,
	"John W. Linville" <linville@...driver.com>,
	rkuo <rkuo@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	linux-wireless@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: mac80211: tx.c: be sure of 'sdata->vif.type' must
 be NL80211_IFTYPE_AP when be in NL80211_IFTYPE_AP case

On 12/02/2013 06:38 AM, Joe Perches wrote:
> On Sun, 2013-12-01 at 10:35 +0100, Johannes Berg wrote:
>> Good try, but no, now ap_sdata isn't even assigned. :)
> 
> Right.  Oh well.  There's no improving this without
> significant rewrite.  Even then, there may not be much
> overall improvement.
> 
> btw: Chen, I think fall-throughs are fine as long as
> they are commented appropriately.
> 

Hmm... for me, when use fall-through, need 2 things:

 - need a comment.

 - next case need not notice about prev case which fall-through.


If we can not fit the 2 things above, either can not use sub functions
or macros for it because of performance reason, 'goto' is better than
'fall-through'.

For me, in most cases, when a function becomes a long function, it is
always better to use sub-fuctions or macros instead of some blocks (but
it is really not urgent :-) ).


Thanks.
-- 
Chen Gang
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