Re: [PATCH] drivers/ata: Add the SW NCQ support to sata_nv forMCP51/MCP55/MCP61

[Alan Cox]

> 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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