RE: OHCI issue with RT patch

Hi,
> > I did further debugging on this and seems the issue could be due to
> > RT changes done at kernel/irq/manage.c
> >
> > We faced the same hang issue even when CONFIG_PREEMPT_RT is disabled.
> > Then we tried below patch which reverts a change by RT patch and
> > observed it to start working fine.
> >
> > ------------ ------- ----------------
> > --- a/kernel/irq/manage.c
> > +++ b/kernel/irq/manage.c
> >  <at>  <at>  -746,8 +746,9  <at>  <at>  __setup_irq(unsigned int irq, struct irq_desc *desc,
> > struct irqaction *new) rand_initialize_irq(irq);
> >         }
> >
> > -       /* Preempt-RT setup for forced threading */
> > -       preempt_hardirq_setup(new);
> > +       /* Oneshot interrupts are not allowed with shared */
> > +       if ((new->flags & IRQF_ONESHOT) && (new->flags & IRQF_SHARED))
> > +               return -EINVAL;
> >
> >         /*
> >          * Check whether the interrupt nests into another interrupt
> 
> Do I understand correctly that by this change you are disabling important
> part if preempt-rt, namely hardirq threading?

Yes, correct and that's why it seems I am getting series of kernel panics.

-Ajay
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