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Date: Wed, 3 Sep 2014 14:26:54 +0300
From: "Michael S. Tsirkin" <mst@redhat.com>
Message-ID: <20140903112654.GA9982@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v3] vhost_net: cleanup recovery
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To: Jason Wang <jasowang@redhat.com>
Cc: Andrey Korolyov <andrey@xdel.ru>, qemu-devel@nongnu.org, qemu-stable@nongnu.org

On Wed, Sep 03, 2014 at 06:52:46PM +0800, Jason Wang wrote:
> On 09/03/2014 06:35 PM, Michael S. Tsirkin wrote:
> > commit aad4dce934649b3a398396fc2a76f215bb194ea4
> >     vhost_net: start/stop guest notifiers properly
> >
> > changed the order of calls for guest notifiers,
> > but did not recover in the correct (reverse) order.
> > Fix it up.
> >
> > Cc: qemu-stable@nongnu.org
> > Cc: Andrey Korolyov <andrey@xdel.ru>
> > Cc: Jason Wang <jasowang@redhat.com>
> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> > ---
> >  hw/net/vhost_net.c | 12 +++++++++---
> >  1 file changed, 9 insertions(+), 3 deletions(-)
> >
> > diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
> > index ba5d544..3819044 100644
> > --- a/hw/net/vhost_net.c
> > +++ b/hw/net/vhost_net.c
> > @@ -289,7 +289,7 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
> >      BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
> >      VirtioBusState *vbus = VIRTIO_BUS(qbus);
> >      VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
> > -    int r, i = 0;
> > +    int r, e, i;
> >  
> >      if (!vhost_net_device_endian_ok(dev)) {
> >          error_report("vhost-net does not support cross-endian");
> > @@ -317,16 +317,22 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
> >          r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
> >  
> >          if (r < 0) {
> > -            goto err;
> > +            goto err_start;
> >          }
> >      }
> >  
> >      return 0;
> >  
> > -err:
> > +err_start:
> >      while (--i >= 0) {
> >          vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
> >      }
> > +    e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
> > +    if (e < 0) {
> > +        fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
> > +        fflush(stderr);
> > +    }
> > +err:
> >      return r;
> >  }
> >  
> 
> Acked-by: Jason Wang <jasowang@redhat.com>


OK I will just roll this up into the original patch.