netdev - [PATCH net-next v3 16/16] virtio_net: take the rtnl lock when calling virtnet_set

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Date:   Fri, 12 Mar 2021 16:04:44 +0100
From:   Antoine Tenart <atenart@...nel.org>
To:     davem@...emloft.net, kuba@...nel.org, alexander.duyck@...il.com,
        mst@...hat.com, jasowang@...hat.com
Cc:     Antoine Tenart <atenart@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH net-next v3 16/16] virtio_net: take the rtnl lock when calling virtnet_set_affinity

netif_set_xps_queue must be called with the rtnl lock taken, and this is
now enforced using ASSERT_RTNL(). In virtio_net, netif_set_xps_queue is
called by virtnet_set_affinity. As this function can be called from an
ethtool helper, we can't take the rtnl lock directly in it. Instead we
take the rtnl lock when calling virtnet_set_affinity when the rtnl lock
isn't taken already.

Signed-off-by: Antoine Tenart <atenart@...nel.org>
---
 drivers/net/virtio_net.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index dde9bbcc5ff0..54d2277f6c98 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2027,7 +2027,9 @@ static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
 {
 	struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
 						   node);
+	rtnl_lock();
 	virtnet_set_affinity(vi);
+	rtnl_unlock();
 	return 0;
 }
 
@@ -2035,7 +2037,9 @@ static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
 {
 	struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
 						   node_dead);
+	rtnl_lock();
 	virtnet_set_affinity(vi);
+	rtnl_unlock();
 	return 0;
 }
 
@@ -2883,7 +2887,9 @@ static int init_vqs(struct virtnet_info *vi)
 		goto err_free;
 
 	get_online_cpus();
+	rtnl_lock();
 	virtnet_set_affinity(vi);
+	rtnl_unlock();
 	put_online_cpus();
 
 	return 0;
-- 
2.29.2