linux-kernel - Re: 2.6.33-rc3 regression: leds_alix2: can't allocate I/O for GPIO

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Date:	Thu, 07 Jan 2010 12:58:04 +0100
From:	Arnd Hannemann <hannemann@...s.rwth-aachen.de>
To:	Richard Purdie <rpurdie@...ys.net>
Cc:	Arnd Hannemann <Arnd.Hannemann@...s.rwth-aachen.de>,
	Daniel Mack <daniel@...aq.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-geode@...ts.infradead.org" <linux-geode@...ts.infradead.org>
Subject: Re: 2.6.33-rc3 regression: leds_alix2: can't allocate I/O for GPIO

Richard Purdie schrieb:
> On Thu, 2010-01-07 at 11:26 +0100, Arnd Hannemann wrote:
>> with 2.6.33-rc3 the LEDs are not working anymore on my Geode embedded board:
>> If I remember correctly this was working fine with 2.6.32, but certainly with 2.6.31
>>
>> relevant dmesg output of 2.6.33-rc3:
>>
>> [    0.709643] cs5535_gpio: base=0x6100 mask=0xb003c66 major=253
>>
>> [    2.207947] leds_alix2: system is recognized as "PC Engines ALIX.2 v0.99h"
>> [    2.228678] leds_alix2: can't allocate I/O for GPIO
>>
>>
>> For reference dmesg of 2.6.31.3:
>>
>> [    0.611953] cs5535_gpio: base=0x6100 mask=0xb003c66 major=253
>>
>> [    2.379114] leds_alix2: system is recognized as "PC Engines ALIX.2"
>> [    2.399097] Registered led device: alix:1
>> [    2.411404] Registered led device: alix:2
>> [    2.423720] Registered led device: alix:3
> 
> Its likely to be commit 7f131cf3ed96c969d7b092bf629e25c3df50901e. It
> looks like the request_region() call is failing. Daniel, any idea why?

Some additional debug information:

elara:~# rdmsr 0x5140000C
f00100006100

/proc/ioports says:
6100-61ff : 0000:00:0f.0
  6100-61ff : cs5535_gpio

BTW: why is request_region() needed there after all?

Best regards,
Arnd
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