linux-kernel - Re: [PATCH 2/2] Workaround for SB600 SATA ODD issue

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Date:	Sat, 4 Nov 2006 12:52:45 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Luugi Marsan <luugi.marsan@....com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Workaround for SB600 SATA ODD issue

On Fri, Nov 03, 2006 at 02:00:04PM -0500, Luugi Marsan wrote:
> From: conke.hu@....com
> 
> There was an ASIC bug in the SB600 SATA controller of low revision (<=13) and CD burning may hang (only SATA ODD has this issue, and SATA HDD works well). The patch provides a workaround for this issue.

Please make the code ahear to Documentation/CodingStyle (aka the style
used everywhere else in ahci.c..)

Something like:

static int ahci_check_atapi_dma(struct ata_queued_cmd *qc)
{
	struct pci_dev *pdev = to_pci_dev(qc->ap->host->dev);

	/*
	 * Walkaround for ATI/AMD SB600 SATA ODD isue.
	 */
	if (pdev->vendor = PCI_VENDOR_ID_ATI && pdev->device == 0x4380) {
		struct ahci_host_priv *priv = qc->ap->host->private_data;

		if (priv->rev < 14) {
			u32 rq_len = qc->scsicmd->request_bufflen;
			u32 low_8k = rq_len & 0x1fff;

			if ((rq_len & 0xffffe000) && low_8k && low_8k < 512)
        	               	return 1;
		}
	}

	return 0;
}
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