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	Fri, 28 Jan 2011 04:25:51 -0500
Subject: Re: did compat-wireless-2011-01-27 crash dhcpcd?
From: Johannes Berg <johannes@sipsolutions.net>
To: Brian Prodoehl <bprodoehl@gmail.com>
Cc: James <bjlockie@lockie.ca>,
	linux-wireless Mailing List <linux-wireless@vger.kernel.org>
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Date: Fri, 28 Jan 2011 10:25:46 +0100
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On Thu, 2011-01-27 at 18:39 -0500, Brian Prodoehl wrote:
> On Thu, Jan 27, 2011 at 6:21 PM, James <bjlockie@lockie.ca> wrote:
> > On 01/27/11 17:09, Hauke Mehrtens wrote:
> >> On 01/27/2011 09:52 PM, James wrote:
> >>> cfg80211: Calling CRDA to update world regulatory domain
> >>> Compat-wireless backport release: compat-wireless-2011-01-06-3-g8db1608
> >>> Backport based on linux-next.git next-20110121
> >>> ath9k 0000:02:09.0: PCI INT A -> Link[LNKB] -> GSI 17 (level, low) -> IRQ 17
> >>> ath: EEPROM regdomain: 0x10
> >>> ath: EEPROM indicates we should expect a direct regpair map
> >>> ath: Country alpha2 being used: CO
> >>> ath: Regpair used: 0x10
> >>> ieee80211 phy0: Selected rate control algorithm 'ath9k_rate_control'
> >>
> >>> cfg80211: wext will not work because kernel was compiled with
> >>> CONFIG_WIRELESS_EXT=n. Tools using wext interface, like iwconfig will
> >>> not work.
> >> WEXT is deactivated in compat-wireless because CONFIG_WIRELESS_EXT=y was
> >> not set in your kernel config and iwconfig does not work without wext.
> >>
> >> See: http://www.spinics.net/lists/linux-wireless/msg63449.html
> >>
> >> Hauke
> >> --
> >
> > I'm not using any tools.
> > The call trace happens after I do a modprobe.
> > I'm guessing it doesn't like dhcpcd.
> >
> > Do I really need CONFIG_WIRELESS_EXT?
> > --
> 
> 
> Something is trying to use wext.  This is from your original message:
> 
> BUG: unable to handle kernel NULL pointer dereference at 00000000000001dc
> IP: [<ffffffff8130fb9d>] wext_handle_ioctl+0xae/0x165

There's still something wrong in compat if that causes it to crash
though.

johannes