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Date:	Thu, 30 Aug 2007 14:05:30 +0200
From:	Johannes Berg <>
To:	Jochen Voss <>
Cc:	linux wireless list <>,, netdev <>,
Subject: Re: oops with recent wireless-dev tree

Hi Jochen,

[added CCs since it affects bridge code]

> If I read this correctly, the EIP in the last line corresponds to
> net/bridge/br_if.c, line 36:
>     static int port_cost(struct net_device *dev)
>     {
> 	    if (dev->ethtool_ops->get_settings) {
>                                ^^^^
> As far as I can figure out, dev->ethtool_ops is NULL and the crash
> happens while trying to derefernce ...->get_settings.
> Is dev->ethtool_ops allowed to be NULL?  In this case the appended
> patch might be the correct fix.  At least it makes the oops disappear
> for me.  Another possible fix would be to add an ethtool_ops structure
> to the device created by b43.

I don't think adding ethtool_ops in mac80211 should be necessary.


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