Scatter-gather list constraints

[Alan Stern]

Is there any way to express the constraint that for a particular 
request queue, all members of a scatter-gather list (except the last) 
must be a multiple of a particular length?

This question arises in connection with wireless USB mass-storage
devices.  The controller driver requires that all DMA segments
in a transfer, other than the last one, have a multiple of 1024 bytes.  
But we're sometimes getting s-g lists where an element contains an odd
number of 512-byte sectors, and of course it doesn't work.

Thanks,

Alan Stern

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