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:	Tue, 23 Sep 2014 20:52:55 +0200
From:	Frank Schäfer <fschaefer.oss@...glemail.com>
To:	Luca Olivetti <luca@...toso.org>,
	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)


Am 19.09.2014 um 21:55 schrieb Luca Olivetti:
> El 19/09/14 21:22, Frank Schäfer ha escrit:
>
>>> So symbol_request() returns pointers.!= NULL
>>>
>>> A closer look at the definition of symbol_request() shows, that it does
>>> nothing if CONFIG_MODULES is disabled (it just returns its argument).
>>>
>>>
>>> One possibility to fix this bug would be to embrace these three lines with
>>>
>>> #ifdef CONFIG_DVB_USB_AF9005_REMOTE
>>> ...
>>> #endif
>> Luca, what do you think ?
>>
>> 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
> Well, it's been a while so I don't remember the details, but I think the
> same now as then ;-)
> The idea behind CONFIG_DVB_USB_AF9005_REMOTE was to provide an
> alternative implementation (based on lirc, at the time it wasn't in the
> kernel), since this adapter doesn't decode the IR pulses by itself.
> In theory you could leave it undefined but still provide an
> implementation in a different module. Just adding
>
> #ifdef CONFIG_DVB_USB_AF9005_REMOTE
>
> would nuke the (futile?) effort.
>
> Now, since the problem seems to be with CONFIG_MODULES disabled, maybe
> you could combine both conditions
>
> #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 ?

Regards,
Frank

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