[PATCH net-next 05/15] batman-adv: bat_v: initialize last_unicast_tx on neighbor creation

[Simon Wunderlich <sw@simonwunderlich.de>]

From: Sven Eckelmann <sven@narfation.org>

hardif_neigh->bat_v.last_unicast_tx is implicitly initialized to 0. As long
as no unicast packet was sent to a neighbor, the delta computed in
batadv_v_elp_wifi_neigh_probe() is therefore relative to an arbitrary point
in time. When the truncated millisecond delta happens to fall into [0,
BATADV_ELP_PROBE_MAX_TX_DIFF] (for example when jiffies passes 2^32 about 5
minutes after boot), the throughput probe for this neighbor is skipped for
one ELP interval.

Initialize last_unicast_tx on neighbor creation to a defined value to
ensure that new neighbors behave the same way - at least independent of the
time when they were created.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---
 net/batman-adv/bat_v.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c
index 596889b3522d0..4a25e513864ca 100644
--- a/net/batman-adv/bat_v.c
+++ b/net/batman-adv/bat_v.c
@@ -143,6 +143,7 @@ static void batadv_v_iface_update_mac(struct batadv_hard_iface *hard_iface)
 static void
 batadv_v_hardif_neigh_init(struct batadv_hardif_neigh_node *hardif_neigh)
 {
+	WRITE_ONCE(hardif_neigh->bat_v.last_unicast_tx, jiffies);
 	ewma_throughput_init(&hardif_neigh->bat_v.throughput);
 }
 
-- 
2.47.3