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

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Message-ID: <20080222094828.2a0124ca@core>
Date:	Fri, 22 Feb 2008 09:48:28 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	torvalds@...l.org, jeff@...zik.org
Subject: GAK!!!! Re: PCI: AMD SATA IDE mode quirk

>     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))

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