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Date:   Wed, 22 May 2019 08:07:46 +0200
From:   Andreas Oetken <>
To:     unlisted-recipients:; (no To-header on input)
        Andreas Oetken <>,
        Arvid Brodin <>,
        "David S. Miller" <>,,
Subject: [PATCH] hsr: fix don't prune the master node from the node_db

Don't prune master node in the hsr_prune_nodes function.
Neither time_in[HSR_PT_SLAVE_A], nor time_in[HSR_PT_SLAVE_B],
will ever be updated by hsr_register_frame_in for the master port.
Thus the master node will be repeatedly pruned leading to
repeated packet loss.
This bug never appeared because the hsr_prune_nodes function
was only called once. Since commit 5150b45fd355
("net: hsr: Fix node prune function for forget time expiry") this issue
is fixed unvealing the issue described above.

Signed-off-by: Andreas Oetken <>
 net/hsr/hsr_framereg.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c
index 9fa9abd83018..2d7a19750436 100644
--- a/net/hsr/hsr_framereg.c
+++ b/net/hsr/hsr_framereg.c
@@ -365,6 +365,14 @@ void hsr_prune_nodes(struct timer_list *t)
 	list_for_each_entry_rcu(node, &hsr->node_db, mac_list) {
+		/* Don't prune own node. Neither time_in[HSR_PT_SLAVE_A]
+		 * nor time_in[HSR_PT_SLAVE_B], will ever be updated for
+		 * the master port. Thus the master node will be repeatedly
+		 * pruned leading to packet loss.
+		 */
+		if (hsr_addr_is_self(hsr, node->macaddress_A))
+			continue;
 		/* Shorthand */
 		time_a = node->time_in[HSR_PT_SLAVE_A];
 		time_b = node->time_in[HSR_PT_SLAVE_B];

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