linux-kernel - Re: MODULE_DEVICE_TABLE(isapnp, ...) does nothing

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Message-ID: <ac3eb2510911250405j6551150eu4b68261a2e03514f@mail.gmail.com>
Date:	Wed, 25 Nov 2009 13:05:40 +0100
From:	Kay Sievers <kay.sievers@...y.org>
To:	Ondrej Zary <linux@...nbow-software.org>
Cc:	Takashi Iwai <tiwai@...e.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org,
	Jon Masters <jonathan@...masters.org>,
	Jaroslav Kysela <perex@...ex.cz>, Greg KH <gregkh@...e.de>
Subject: Re: MODULE_DEVICE_TABLE(isapnp, ...) does nothing

On Tue, Nov 24, 2009 at 22:23, Ondrej Zary <linux@...nbow-software.org> wrote:
> On Tuesday 24 November 2009 09:57:28 Kay Sievers wrote:

>> Oh, your box has acpi mapped pnp aliases for this device? You can see
>> your ID string somewhere in this list?
>>   grep . /sys/bus/acpi/devices/*/modalias
>>
>> If not, is it in the pnp bus list?
>>   grep . /sys/bus/pnp/devices/*/id
>
> It's listen in the pnp bus only:
>
> $ grep -i 80d6 /sys/bus/acpi/devices/*/modalias
> $ grep -i 80d6 /sys/bus/pnp/devices/*/id
> /sys/bus/pnp/devices/01:01.00/id:PNP80d6
> $ cat /sys/bus/pnp/devices/01\:01.00/id
> RTL8019
> PNP80d6
>
> So the acpi alias was useless (I just copied another entry). This alone works:
> alias pnp:dPNP80d6* ne

I see. Plain upstream udev would not load anything here, as the pnp
bus has no modalias support because of the non-working aliases. We
rely on acpi mapping all the pnp entries. Your system probably runs
the shell script which iterates over the "id" file and calls modprobe
for all it finds in there.

Kay
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