netdev - Re: [PATCH net] virtio-net: fix race between set queues and probe

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Date: Wed, 26 Jul 2023 09:54:52 +0800
From: Jason Wang <jasowang@...hat.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: xuanzhuo@...ux.alibaba.com, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, pabeni@...hat.com, virtualization@...ts.linux-foundation.org, 
	netdev@...r.kernel.org
Subject: Re: [PATCH net] virtio-net: fix race between set queues and probe

On Tue, Jul 25, 2023 at 3:53 PM Michael S. Tsirkin <mst@...hat.com> wrote:
>
> On Tue, Jul 25, 2023 at 03:20:49AM -0400, Jason Wang wrote:
> > A race were found where set_channels could be called after registering
> > but before virtnet_set_queues() in virtnet_probe(). Fixing this by
> > moving the virtnet_set_queues() before netdevice registering. While at
> > it, use _virtnet_set_queues() to avoid holding rtnl as the device is
> > not even registered at that time.
> >
> > Fixes: a220871be66f ("virtio-net: correctly enable multiqueue")
> > Signed-off-by: Jason Wang <jasowang@...hat.com>
>
>
> Acked-by: Michael S. Tsirkin <mst@...hat.com>
>
> stable material I guess?

Yes it is.

Thanks

>
> > ---
> >  drivers/net/virtio_net.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> > index 0db14f6b87d3..1270c8d23463 100644
> > --- a/drivers/net/virtio_net.c
> > +++ b/drivers/net/virtio_net.c
> > @@ -4219,6 +4219,8 @@ static int virtnet_probe(struct virtio_device *vdev)
> >       if (vi->has_rss || vi->has_rss_hash_report)
> >               virtnet_init_default_rss(vi);
> >
> > +     _virtnet_set_queues(vi, vi->curr_queue_pairs);
> > +
> >       /* serialize netdev register + virtio_device_ready() with ndo_open() */
> >       rtnl_lock();
> >
> > @@ -4257,8 +4259,6 @@ static int virtnet_probe(struct virtio_device *vdev)
> >               goto free_unregister_netdev;
> >       }
> >
> > -     virtnet_set_queues(vi, vi->curr_queue_pairs);
> > -
> >       /* Assume link up if device can't report link status,
> >          otherwise get link status from config. */
> >       netif_carrier_off(dev);
> > --
> > 2.39.3
>