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

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Message-ID: <45FCD0FB.70507@gmail.com>
Date:	Sun, 18 Mar 2007 14:41:15 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Jon Masters <jonathan@...masters.org>
CC:	Chuck Ebbert <cebbert@...hat.com>,
	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

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?

-- 
tejun
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