JBT driver atomic state transition patch

[Nicolas Dufresne]

Andy,

I've reviewed the merge of WSOD patch into andy-tracking kernel and it
does not seem to be the cause of the regression that as been reported in
bug #2126. Attached, you'll find a correction that makes state
transition atomic. That will prevent getting bad states when the driver
is altered by two of more thread.

regards,
Nicolas
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