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SubjectRe: [PATCH V4 0/9] rework on the IRQ hardening of virtio
On Wed, 11 May 2022 10:22:59 +0800
Jason Wang <jasowang@redhat.com> wrote:

> > CPU0
> > ----
> > lock(&vcdev->irq_lock);
> > <Interrupt>
> > lock(&vcdev->irq_lock);
> >
> > *** DEADLOCK ***
>
> It looks to me we need to use write_lock_irq()/write_unlock_irq() to
> do the synchronization.
>
> And we probably need to keep the
> read_lock_irqsave()/read_lock_irqrestore() logic since I can see the
> virtio_ccw_int_handler() to be called from process context (e.g from
> the io_subchannel_quiesce()).
>

Sounds correct.

Regards,
Halil

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