netdev - Re: [Bugme-new] [Bug 11144] New: dhcp doesn't work with iwl4965

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Message-ID: <4887550B.2070704@tvcablenet.be>
Date:	Wed, 23 Jul 2008 17:58:03 +0200
From:	François Valenduc 
	<francois.valenduc@...ablenet.be>
To:	Patrick McHardy <kaber@...sh.net>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	bugme-daemon@...zilla.kernel.org, linux-wireless@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Jussi Kivilinna <jussi.kivilinna@...et.fi>
Subject: Re: [Bugme-new] [Bug 11144] New: dhcp doesn't work with iwl4965

Patrick McHardy a écrit :
> François Valenduc wrote:
>> Patrick McHardy a écrit :
>>>> I think I know whats happening (Jussi CCed). That commit introduced
>>>> a qdisc_skb_cb, which conflicts with the mac80211 usage of skb->cb.
>>>> mac80211 seems to expect the CB to survive the qdisc layer, which
>>>> is wrong. One possibility to fix this (or just test my theory)
>>>> would be to make sure they don't clash by adding the struct
>>>> ieee80211_tx_info to qdisc_skb_cb->data. Something like this patch.
>>>>
>>>
>> I tested your last patch. Unfortunately, I get the following compile 
>> error:
>>
>> In file included from net/mac80211/main.c:11:
>> include/net/mac80211.h: In function ‘IEEE80211_SKB_CB’:
>> include/net/mac80211.h:347: erreur: size of array ‘type name’ is 
>> negative
>
>
> I was afraid that might happen. This means skb->cb is not large
> enough to hold both the qdisc and the ieee80211 structs.
>
> Just for testing, changing (include/net/mac80211.h):
>
> #define IEEE80211_TX_INFO_DRIVER_DATA_SIZE \
>         (sizeof(((struct sk_buff *)0)->cb) - 8)
>
> to
>
> #define IEEE80211_TX_INFO_DRIVER_DATA_SIZE \
>         (sizeof(((struct sk_buff *)0)->cb) - 12)
>
> might help to get it to compile. If that doesn't work, try -16.
>
>
That didn't work, neither with -12 or -16.

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