linux-kernel - Re: Loading both the pata_atiixp and the ahci driver causes problems

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Message-ID: <45FDAD74.9010402@redhat.com>
Date:	Sun, 18 Mar 2007 17:21:56 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Tejun Heo <htejun@...il.com>
CC:	Jon Masters <jonathan@...masters.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jeff Garzik <jgarzik@...ox.com>, linux-ide@...r.kernel.org,
	Conke Hu <conke.hu@...il.com>
Subject: Re: Loading both the pata_atiixp and the ahci driver causes problems

Tejun Heo wrote:
> Jon Masters wrote:
>> Chuck Ebbert wrote:
>>
>>> If you try to load both the pata_atiixp and the ahci driver
>>> (for the same ATI SB600 adapter), very strange things happen.
>>> The AHCI driver churns for three minutes or so, spewing
>>> messages like this, then nothing works:
>>>
>>> <6>ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
>>> <4>ata3.00: qc timeout (cmd 0xec)
>>> <4>ata3.00: failed to IDENTIFY (I/O error, err_mask=0x104)
>>> Shouldn't it be able to tell the device has already been
>>> claimed by some other driver?
>> One would assume it'd fail to grab the PCI IO ranges twice? I haven't
>> looked at the code but I have seen this bug mentioned elsewhere so I
>> might well end up having to do that yet :-)
> 
> Dunno much about sb600 but ahci and pata_atiixp are probably using
> separate IO regions && separate PCI functions.
> 
> Conke, care to educate us a bit here?
> 

The really funny part is that it works for some if they use:

  pci=noacpi,irqpoll


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