Am Montag, 13. Oktober 2008 schrieb Benjamin Herrenschmidt:
>
> > if (--hp->count == 0) {
> > - if (hp->ops->notifier_del)
> > - hp->ops->notifier_del(hp, hp->data);
> > -
> > /* We are done with the tty pointer now. */
> > hp->tty = NULL;
> > spin_unlock_irqrestore(&hp->lock, flags);
> >
> > + if (hp->ops->notifier_del)
> > + hp->ops->notifier_del(hp, hp->data);
> > +
>
> I will try. Of course the risk here is that the interrupt happens
> after we set hp->tty to NULL, so we probably need to check within the
> interrupt handler for a NULL tty. I haven't checked if that's the case
> (I'm not in front of the code right now).
Even the old code (without my patch) was setting hp->tty to NULL before doing
the irq_free, so that should be ok.
Christian
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