From: Alan Stern <stern@rowland.harvard.edu>
Date: Fri, 20 Jun 2008 16:30:25 -0400 (EDT)
The generic device layer DMA bits does have ways to indicate
DMA restrictions such as maximum segment size, but not something
like this.
This is a pretty strange requirement, and would be probably be
quite difficult to support across the board just to handle this
strange device :)
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