linux-kernel - Re: [media/dvb_usb_af9005] BUG: unable to handle kernel paging request (WAS: [media/em28xx] BUG: unable to handle kernel)

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Date:	Thu, 25 Sep 2014 17:57:31 +0200
From:	Luca Olivetti <luca@...toso.org>
To:	Frank Schäfer <fschaefer.oss@...glemail.com>,
	Fengguang Wu <fengguang.wu@...el.com>
CC:	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	linux-media@...r.kernel.org, Jet Chen <jet.chen@...el.com>,
	Su Tao <tao.su@...el.com>, Yuanhan Liu <yuanhan.liu@...el.com>,
	LKP <lkp@...org>, linux-kernel@...r.kernel.org, crope@....fi
Subject: Re: [media/dvb_usb_af9005] BUG: unable to handle kernel paging request
 (WAS: [media/em28xx] BUG: unable to handle kernel)

El 25/09/14 15:54, Frank Schäfer ha escrit:
> 
> Am 23.09.2014 um 23:03 schrieb Luca Olivetti:
>> El 23/09/14 20:52, Frank Schäfer ha escrit:
>>
>>>>> This seems to be an ancient bug, which is known at least since 5 1/2 years:
>>>>> https://lkml.org/lkml/2009/2/4/350
>> [...]
>>>> #if defined(CONFIG_MODULE) || defined(CONFIG_DVB_USB_AF9005_REMOTE)
>>> What happens, if CONFIG_MODULES is enabled, but neither module
>>> af9005-remote nor any other IR module is available ?
>>> Has this ever been tested ?
>> I think I tested at the time and symbol_request returned NULL in that
>> case, however I'm not sure and I cannot find any documentation on how
>> symbol_request is supposed to work in that case.
> 
> Ok, thanks.
> I assume noone wants to invest some time into this old driver and covert
> it to todays kernel IR infrastructure as suggested by Antti ? :-)

Not me ;-)

> Then I'm going to send a patch with the 
> 
> #if defined(CONFIG_MODULE) || defined(CONFIG_DVB_USB_AF9005_REMOTE)
> 
> approach.
> That's at least better than leaving the bug unfixed.

Yes, it's an acceptable workaround until the bug in symbol_request is
fixed (because the bug actually is in symbol_request, isn't it?)

Bye
-- 
Luca
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