[PATCH] fix-jack-debounce.patch

[Andy Green]

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Somebody in the thread at some point said:
| Andy Green wrote:
|> +	} while (kbd->hp_irq_count != kbd->hp_irq_count_in_work);
| [...]
|> +	kbd->work_in_progress = 0;
|
| There's a bit of a race condition here: if an interrupt happens
| just betwen checking and clearing work_in_progress, this
| interrupt is lost.
|
| Do we care ? Chances for this to happen look extremely small.

Nicely spotted... if it did happen that the interrupt came again after
100ms of silence at exactly the wrong moment in a window of a couple of
us, he would have to replug his jack to get correct operation.  But I
guess it happens once per million times or less.

Anyway I made a patch on top to try to deal with it I will test and send
shortly.

- -Andy
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