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SubjectRe: [PATCH] virtio_balloon: set DRIVER_OK before using device
On Thu, Mar 05, 2015 at 01:24:47PM +1030, Rusty Russell wrote:
> "Michael S. Tsirkin" <mst@redhat.com> writes:
> > virtio spec requires that all drivers set DRIVER_OK
> > before using devices. While balloon isn't yet
> > included in the virtio 1 spec, previous spec versions
> > also required this.
> >
> > virtio balloon might violate this rule: probe calls
> > kthread_run before setting DRIVER_OK, which might run
> > immediately and cause balloon to inflate/deflate.
> >
> > To fix, call virtio_device_ready before running the kthread.
> >
> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
>
> Replied, CC'd stable.

Did you mean applied?

> Thanks,
> Rusty.
>
>
> > ---
> > drivers/virtio/virtio_balloon.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
> > index 5a6ad6d..6a356e3 100644
> > --- a/drivers/virtio/virtio_balloon.c
> > +++ b/drivers/virtio/virtio_balloon.c
> > @@ -508,6 +508,8 @@ static int virtballoon_probe(struct virtio_device *vdev)
> > if (err < 0)
> > goto out_oom_notify;
> >
> > + virtio_device_ready(vdev);
> > +
> > vb->thread = kthread_run(balloon, vb, "vballoon");
> > if (IS_ERR(vb->thread)) {
> > err = PTR_ERR(vb->thread);
> > --
> > MST


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