Re: [PATCH] virtio_balloon: set DRIVER_OK before using device
"Michael S. Tsirkin" writes: > On Thu, Mar 05, 2015 at 01:24:47PM +1030, Rusty Russell wrote: >> "Michael S. Tsirkin" 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 >> >> Replied, CC'd stable. > > Did you mean applied? I stand erected. Franks, Rusty. ___ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
Re: [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" 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
>
> 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
___
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
Re: [PATCH] virtio_balloon: set DRIVER_OK before using device
"Michael S. Tsirkin" 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
Replied, CC'd stable.
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
___
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
[PATCH] virtio_balloon: set DRIVER_OK before using device
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
---
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
___
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
