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    SubjectRe: DMA mapping
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    > of times the Qlogic f/w is confused and returns garbage instead of the correct
    > handle- it's much easier to detect this when you have an index in the range of
    > 0 to 1024 rather than assume what you get back from the card is a valid
    > pointer.

    I did the same for the i2o_block driver where I only had a 32bit wide field.
    Much to my suprise having the index also meant I could use it for other
    things I needed to hang on the requests and speeded the driver up


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