On 12/02/2021 14:52, Laurent Vivier wrote:
> failover_add_primary() calls qdev_device_add() and doesn't unref
> the device. Because of that, when the device is unplugged a reference
> is remaining and prevents the cleanup of the object.
>
> This prevents to be able to plugin back the failover primary device,
> with errors like:
>
> (qemu) device_add
> vfio-pci,host=0000:41:00.0,id=hostdev0,bus=root.3,failover_pair_id=net0
> (qemu) device_del hostdev0
>
> We can check with "info qtree" and "info pci" that the device has been
> removed, and then:
>
> (qemu) device_add
> vfio-pci,host=0000:41:00.0,id=hostdev1,bus=root.3,failover_pair_id=net0
> Error: vfio 0000:41:00.0: device is already attached
> (qemu) device_add
> vfio-pci,host=0000:41:00.0,id=hostdev0,bus=root.3,failover_pair_id=net0
> qemu-kvm: Duplicate ID 'hostdev0' for device
>
> Fixes: 21e8709b29cd ("failover: Remove primary_dev member")
> Cc: quint...@redhat.com
> Signed-off-by: Laurent Vivier <lviv...@redhat.com>
I forgot to copy from the first review:
Reviewed-by: Jens Freimann <jfreim...@redhat.com>
> ---
> hw/net/virtio-net.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 5150f295e8c5..1c5af08dc556 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -862,6 +862,8 @@ static void failover_add_primary(VirtIONet *n, Error
> **errp)
> dev = qdev_device_add(opts, &err);
> if (err) {
> qemu_opts_del(opts);
> + } else {
> + object_unref(OBJECT(dev));
> }
> } else {
> error_setg(errp, "Primary device not found");
>
