Patch-mainline: v6.5-rc7
Git-commit: 51b813176f098ff61bd2833f627f5319ead098a5
References: git-fixes
From: Jason Wang <jasowang@redhat.com>
Date: Wed, 9 Aug 2023 23:12:56 -0400
Subject: [PATCH] virtio-net: set queues after driver_ok
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@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: Juergen Gross <jgross@suse.com>
---
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)
}
}
- _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);
+
rtnl_unlock();
err = virtnet_cpu_notif_add(vi);
--
2.35.3