linux-kernel - Re: [PATCH] drivers/ata: Add the SW NCQ support to sata

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Message-ID: <20070518133456.5f1392e9@the-village.bc.nu>
Date:	Fri, 18 May 2007 13:34:56 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Zoltan Boszormenyi <zboszor@...aweb.hu>,
	Peer Chen <pchen@...dia.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/ata: Add the SW NCQ support to sata_nv for
 MCP51/MCP55/MCP61

> That shouldn't be a problem, libata default DMA mask is 32 bits (which 
> isn't overridden with this controller) and so the block layer will 
> bounce any data being read/written above that point with IOMMU or 
> swiotlb. The comment is a bit unnecessarily scary.

Adding a BUG_ON for this would be wise. Its trivial to check and a BUG
rather than corruption if this assumption ever changes would be far
preferable
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