On Mon, 2007-09-24 at 15:44 +0200, Dor Laor wrote:
> Rusty Russell wrote:
> > +irqreturn_t vring_interrupt(int irq, void *_vq)
> > +{
> > + struct vring_virtqueue *vq = to_vvq(_vq);
> > +
> > + pr_debug("virtqueue interrupt for %p\n", vq);
> > +
> > + if (unlikely(vq->broken))
> > + return IRQ_HANDLED;
> > +
> > + if (more_used(vq)) {
> > + pr_debug("virtqueue callback for %p (%p)\n",
> > + vq, vq->vq.callback);
> > + if (!vq->vq.callback)
> > + return IRQ_NONE;
> > + if (!vq->vq.callback(&vq->vq))
> > + vq->vring.avail->flags |=
> > VRING_AVAIL_F_NO_INTERRUPT;
> > + } else
> > + pr_debug("virtqueue %p no more used\n", vq);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> >
> Seems like there is a problem with shared irq line, the interrupt
> handler always returns IRQ_HANDLED (except for the trivial case
> were the callback is null).
To reply for a second time, this time with thought. Sorry.
Yes, this code is wrong. It should be:
irqreturn_t vring_interrupt(int irq, void *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
if (!more_used(vq)) {
pr_debug("virtqueue interrupt with no work for %p\n", vq);
return IRQ_NONE;
}
if (unlikely(vq->broken))
return IRQ_HANDLED;
pr_debug("virtqueue callback for %p (%p)\n", vq, vq->vq.callback);
if (vq->vq.callback && !vq->vq.callback(&vq->vq))
vq->vring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
return IRQ_HANDLED;
}
Cheers,
Rusty.
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