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

["François Valenduc" <francois.valenduc@tvcablenet.be>]

Patrick McHardy a =C3=A9crit :
> Fran=C3=A7ois Valenduc wrote:
>> Patrick McHardy a =C3=A9crit :
>>>> I think I know whats happening (Jussi CCed). That commit introduce=
d
>>>> a qdisc_skb_cb, which conflicts with the mac80211 usage of skb->cb=
=2E
>>>> 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=
=2E
>>>>
>>>
>> I tested your last patch. Unfortunately, I get the following compile=
=20
>> error:
>>
>> In file included from net/mac80211/main.c:11:
>> include/net/mac80211.h: In function =E2=80=98IEEE80211_SKB_CB=E2=80=99=
:
>> include/net/mac80211.h:347: erreur: size of array =E2=80=98type name=
=E2=80=99 is=20
>> 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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