On Tue, 25 Jul 2023 03:20:49 -0400, Jason Wang <jasowang@xxxxxxxxxx> 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@xxxxxxxxxx>
Reviewed-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
> ---
> 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
>
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