linux-kernel - Re: [PATCH] acerhdf: Limit modalias matching to supported boards

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Date:	Fri, 02 Oct 2009 08:50:52 +0200
From:	Peter Feuerer <peter@...e.net>
To:	Borislav Petkov <petkovbb@...glemail.com>
Cc:	Stefan Bader <stefan.bader@...onical.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] acerhdf: Limit modalias matching to supported boards

Borislav Petkov writes:

> On Wed, Sep 30, 2009 at 02:13:55PM +0200, Stefan Bader wrote:
>> We got reports of acerhdf issuing warnings on Acer laptops other
>> than Aspire Ones. Looking at the dmi match this sounds a bit to
>> generic. IOW the module gets loaded on any Acer laptop. After the
>> following patch the module gets still loaded on my Aspire One but
>> not on the reported other laptop.
>> The same change might be helpful for the other two dmi matches, but
>> I had no way of testing.
> 
> Yeah, we might need someone with such a machine to give us
> /sys/class/dmi/id/modalias content. Peter, do you have any users with
> such machines?

I search my acerhdf-inbox for the people who sent me the BIOS versions, 
maybe they still have the netbook and can me send the modalias content. I'll 
hopefully find some time upcoming weekend.

But, can't we simply assume, following dmi lines?

MODULE_ALIAS("dmi:*:*Acer*:*AOA*:");
MODULE_ALIAS("dmi:*:*Gateway*:*AOA*:");
MODULE_ALIAS("dmi:*:*Packard Bell*:*AOA*:");
MODULE_ALIAS("dmi:*:*Packard Bell*:*DOA*:");

We have exactly those constellations within the BIOS settings table. If I 
interpret the modalias line correctly, "pnAOA110" means "Product Name 
AOA110" and that's what we have already in the BIOS settings table. So I 
think we do already have all information we need to create a complete patch 
for the problem, or am I wrong?

> 
>> From 389f61f7e66ce615dc6418cb856e167edaa74b42 Mon Sep 17 00:00:00 2001
>> From: Stefan Bader <stefan.bader@...onical.com>
>> Date: Mon, 28 Sep 2009 17:11:29 +0000
>> Subject: [PATCH] UBUNTU: acerhdf: Limit modalias matching to supported boards
>> 
>> BugLink: https://bugs.launchpad.net/ubuntu/+bug/435958
>> 
>> The module alias currently matches any Acer computer but when loaded the
>> BIOS checks will only succeed on Aspire One models. This causes a invalid
>> BIOS warning for all other models (seen on Aspire 4810T).
>> This is not fatal but worries users that see this message. Limiting the
>> moule alias to models starting with AOA. Probably the same change should be
>> made for the two other entries.
>> 
>> Signed-off-by: Stefan Bader <stefan.bader@...onical.com>
> 
> Acked-by: Borislav Petkov <petkovbb@...il.com>
> 
>> ---
>>  drivers/platform/x86/acerhdf.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>> 
>> diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
>> index aa298d6..763f233 100644
>> --- a/drivers/platform/x86/acerhdf.c
>> +++ b/drivers/platform/x86/acerhdf.c
>> @@ -629,7 +629,7 @@ static void __exit acerhdf_exit(void)
>>  MODULE_LICENSE("GPL");
>>  MODULE_AUTHOR("Peter Feuerer");
>>  MODULE_DESCRIPTION("Aspire One temperature and fan driver");
>> -MODULE_ALIAS("dmi:*:*Acer*:*:");
>> +MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
>>  MODULE_ALIAS("dmi:*:*Gateway*:*:");
>>  MODULE_ALIAS("dmi:*:*Packard Bell*:*:");
>>  
>> -- 
>> 1.5.4.5

kind regards,
--peter
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