linux-kernel - Re: GAK!!!! Re: PCI: AMD SATA IDE mode quirk

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Date:	Fri, 22 Feb 2008 11:34:35 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	torvalds@...l.org, jeff@...zik.org
Subject: Re: GAK!!!! Re: PCI: AMD SATA IDE mode quirk

On 02/22/2008 11:02 AM, Alan Cox wrote:
> On Fri, 22 Feb 2008 09:48:28 +0000
> Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> 
>>>     Signed-off-by: Crane Cai <crane.cai@....com>
>>>     Acked-by: Jeff Garzik <jeff@...zik.org>
>>>     Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
>> Vomitted-upon-by: Alan Cox <alan@...hat.com>
>>
>>> -	if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
>>> -		u8 tmp;
>>> +	/* set sb600/sb700/sb800 sata to ahci mode */
>>> +	u8 tmp;
>>>  
>>> +	pci_read_config_byte(pdev, PCI_CLASS_DEVICE, &tmp);
>>> +	if (tmp == 0x01) {
>> CLASS_DEVICE is cached in pdev->class so why not simply do:
>>
>> 	if (pdev->class & (1 << 8))
> 
> or better yet
> 
> 	((pdev->class & 0xFF00) == 0x0100)

Isn't it what was there before the change:
 >>> -	if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
 >>> -		u8 tmp;
and there was some reason to change it?
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