linux-kernel - Re: [crash] af9005_usb_module_init(): BUG: unable to handle kernel paging request at ff100000

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Date:	Tue, 03 Feb 2009 21:41:18 +0100
From:	Luca Olivetti <luca@...toso.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Daniel Walker <dwalker@...o99.com>, Greg KH <gregkh@...e.de>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-kernel@...r.kernel.org, Hans Verkuil <hverkuil@...all.nl>,
	Janne Grunau <janne-dvb@...nau.be>
Subject: Re: [crash] af9005_usb_module_init(): BUG: unable to handle kernel
 paging request at ff100000

En/na Ingo Molnar ha escrit:
> * Daniel Walker <dwalker@...o99.com> wrote:
> 
>> On Tue, 2009-02-03 at 18:28 +0100, Ingo Molnar wrote:
>>> FYI, -tip qa keeps triggering this bootup crash occasionally, ever since 
>>> June 2008 when a DVB merge brought in this new driver:
>> It looks like it could be a config problem.. The crash happens around 
>> these two symbol "af9005_rc_keys", and "af9005_rc_keys_size" , and they 
>> are both defined inside af9005-remote.c different from where the init 
>> functions is lcoated .. af9005-remote.c needs a special config 
>> CONFIG_DVB_USB_AF9005_REMOTE to get compiled which you have disabled..
> 
> ok - but it shouldnt crash, obviously.

Did you try my suggestion I sent the past December 26th?
Quote:

El Fri, 26 Dec 2008 11:08:33 -0200
Mauro Carvalho Chehab <mchehab@...radead.org> escribió:
 > > Luca,
 > >
 > > Could you please verify this issue?

No, I don't have 2.6.28, but I guess that maybe once usb_register is
called the dvb-usb subsystem asynchronously (is that an smp system?)
starts polling the remote before the rc_decode function pointer has been
initialized.
Could you try to initialize it to NULL before calling usb_register?

Bye
-- 
Luca
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