On Tue, Nov 10, 2015 at 10:46:44AM +0000, Andrew Cooper wrote:
> ml_interface_{read,write}() would miscalculate the quantity of
> data/space in the ring if it crossed the ring boundary, and incorrectly
> return a short read/write.
>
> This causes a protocol stall, as either side of the ring ends up waiting
> for what they believe to be the other side needing to take the next
> action.
>
> Correct the calculations to cope with crossing the ring boundary.
>
> In addition, correct the error detection. It is a hard error if the
> producer index gets more than a ring size ahead of the consumer, or if
> the consumer ever overtakes the producer.
>
> Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Reviewed-by: Wei Liu <wei.l...@citrix.com>
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