hsr: ratelimit only when errors are printed

commit 1b0120e4db0bf2838d1ce741195ce4b7cc100b91 upstream.

Recently, when automatically merging -net and net-next in MPTCP devel
tree, our CI reported [1] a conflict in hsr, the same as the one
reported by Stephen in netdev [2].

When looking at the conflict, I noticed it is in fact the v1 [3] that
has been applied in -net and the v2 [4] in net-next. Maybe the v1 was
applied by accident.

As mentioned by Jakub Kicinski [5], the new condition makes more sense
before the net_ratelimit(), not to update net_ratelimit's state which is
unnecessary if we're not going to print either way.

Here, this modification applies the v2 but in -net.

Link: https://github.com/multipath-tcp/mptcp_net-next/actions/runs/4423171069
Link: https://lore.kernel.org/netdev/20230315100914.53fc1760@canb.auug.org.au/
Link: https://lore.kernel.org/netdev/20230307133229.127442-1-koverskeid@gmail.com/
Link: https://lore.kernel.org/netdev/20230309092302.179586-1-koverskeid@gmail.com/
Link: https://lore.kernel.org/netdev/20230308232001.2fb62013@kernel.org/
Fixes: 28e8cabe80f3 ("net: hsr: Don't log netdev_err message on unknown prp dst node")
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Reviewed-by: Steen Hegelund <Steen.Hegelund@microchip.com>
Link: https://lore.kernel.org/r/20230315-net-20230315-hsr_framereg-ratelimit-v1-1-61d2ef176d11@tessares.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c
index bd0afb89911740f85cb21d4d97e693a0c96b32bc..a16f0445023aa0b4bd25fe0707caccec2878447c 100644 (file)
--- a/net/hsr/hsr_framereg.c
+++ b/net/hsr/hsr_framereg.c
@@ -422,7 +422,7 @@ void hsr_addr_subst_dest(struct hsr_node *node_src, struct sk_buff *skb,
        node_dst = find_node_by_addr_A(&port->hsr->node_db,
                                       eth_hdr(skb)->h_dest);
        if (!node_dst) {
-               if (net_ratelimit() && port->hsr->prot_version != PRP_V1)
+               if (port->hsr->prot_version != PRP_V1 && net_ratelimit())
                        netdev_err(skb->dev, "%s: Unknown node\n", __func__);
                return;
        }