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virtio-net: set queues after driver_ok

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commit 51b813176f upstream.

Commit 25266128fe ("virtio-net: fix race between set queues and
probe") tries to fix the race between set queues and probe by calling
_virtnet_set_queues() before DRIVER_OK is set. This violates virtio
spec. Fixing this by setting queues after virtio_device_ready().

Note that rtnl needs to be held for userspace requests to change the
number of queues. So we are serialized in this way.

Fixes: 25266128fe ("virtio-net: fix race between set queues and probe")
Reported-by: Dragos Tatulea <dtatulea@nvidia.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason Wang 2023-08-09 23:12:56 -04:00 • committed by Justin Hammond
parent 16f77f964b
commit b30a69571f
1 changed files with 2 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

4
drivers/net/virtio_net.c
View file

@ -3319,8 +3319,6 @@ static int virtnet_probe(struct virtio_device *vdev)
}
}
_virtnet_set_queues(vi, vi->curr_queue_pairs);
/* serialize netdev register + virtio_device_ready() with ndo_open() */
rtnl_lock();
@ -3333,6 +3331,8 @@ static int virtnet_probe(struct virtio_device *vdev)
virtio_device_ready(vdev);
_virtnet_set_queues(vi, vi->curr_queue_pairs);
rtnl_unlock();
err = virtnet_cpu_notif_add(vi);