Patch-mainline: v6.5-rc4
Git-commit: 25266128fe16d5632d43ada34c847d7b8daba539
References: git-fixes
From: Jason Wang <jasowang@redhat.com>
Date: Tue, 25 Jul 2023 03:20:49 -0400
Subject: [PATCH] virtio-net: fix race between set queues and probe
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.
Cc: stable@vger.kernel.org
Fixes: a220871be66f ("virtio-net: correctly enable multiqueue")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230725072049.617289-1-jasowang@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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 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)
}
}
+ _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);
--
2.35.3