On Tue, 18 May 2010 09:03:17 pm Michael S. Tsirkin wrote: > Rusty, the patch "virtio: imply disable_cb on callbacks" is on your tree. > I'd like to figure out how it works: for example: > > diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c > --- a/drivers/block/virtio_blk.c > +++ b/drivers/block/virtio_blk.c > @@ -69,6 +69,8 @@ static void blk_done(struct virtqueue *v > /* In case queue is stopped waiting for more buffers. */ > blk_start_queue(vblk->disk->queue); > spin_unlock_irqrestore(&vblk->lock, flags); > + > + vq->vq_ops->enable_cb(vq); > } > > static bool do_req(struct request_queue *q, struct virtio_blk *vblk, > > > Since this does not check the return status from enable_cb, > it seems we could loose an interrupt if it arrives > between poll and callback enable?
It's been quite a while since I wrote this patch, and never really liked it enough to polish it. We would need to enable this *before* reading the queue, AFAICT. I'll remove it from my series; it's in the wilderness area already :) Thanks! Rusty. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
