This is a note to let you know that I've just added the patch titled
virtio-net: set queues after driver_ok
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
virtio-net-set-queues-after-driver_ok.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 51b813176f098ff61bd2833f627f5319ead098a5 Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@xxxxxxxxxx>
Date: Wed, 9 Aug 2023 23:12:56 -0400
Subject: virtio-net: set queues after driver_ok
From: Jason Wang <jasowang@xxxxxxxxxx>
commit 51b813176f098ff61bd2833f627f5319ead098a5 upstream.
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@xxxxxxxxxx>
Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/virtio_net.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -3120,8 +3120,6 @@ static int virtnet_probe(struct virtio_d
}
}
- _virtnet_set_queues(vi, vi->curr_queue_pairs);
-
/* serialize netdev register + virtio_device_ready() with ndo_open() */
rtnl_lock();
@@ -3134,6 +3132,8 @@ static int virtnet_probe(struct virtio_d
virtio_device_ready(vdev);
+ _virtnet_set_queues(vi, vi->curr_queue_pairs);
+
rtnl_unlock();
err = virtnet_cpu_notif_add(vi);
Patches currently in stable-queue which might be from jasowang@xxxxxxxxxx are
queue-4.19/virtio-net-set-queues-after-driver_ok.patch
queue-4.19/net-do-not-allow-gso_size-to-be-set-to-gso_by_frags.patch
