Commit 25266128fe16 ("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: 25266128fe16 ("virtio-net: fix race between set queues and
probe")
Reported-by: Dragos Tatulea <dtatulea at nvidia.com>
Acked-by: Michael S. Tsirkin <mst at redhat.com>
Signed-off-by: Jason Wang <jasowang at redhat.com>
---
The patch is needed for -stable.
Changes since V1: Tweak the commit log.
---
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 1270c8d23463..ff03921e46df 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -4219,8 +4219,6 @@ 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();
@@ -4233,6 +4231,8 @@ static int virtnet_probe(struct virtio_device *vdev)
virtio_device_ready(vdev);
+ _virtnet_set_queues(vi, vi->curr_queue_pairs);
+
/* a random MAC address has been assigned, notify the device.
* We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there
* because many devices work fine without getting MAC explicitly
--
2.39.3