5.4-stable review patch. If anyone has any objections, please let me know.
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From: Sven Eckelmann sven@narfation.org
commit e7e34ffc976aaae4f465b7898303241b81ceefc3 upstream.
If a temporary error happened in the evaluation of the neighbor throughput information, then the invalid throughput result should not be stored in the throughtput EWMA.
Cc: stable@vger.kernel.org Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Simon Wunderlich sw@simonwunderlich.de Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/batman-adv/bat_v_elp.c | 41 ++++++++++++++++++++++++++++------------- 1 file changed, 28 insertions(+), 13 deletions(-)
--- a/net/batman-adv/bat_v_elp.c +++ b/net/batman-adv/bat_v_elp.c @@ -58,11 +58,13 @@ static void batadv_v_elp_start_timer(str /** * batadv_v_elp_get_throughput() - get the throughput towards a neighbour * @neigh: the neighbour for which the throughput has to be obtained + * @pthroughput: calculated throughput towards the given neighbour in multiples + * of 100kpbs (a value of '1' equals 0.1Mbps, '10' equals 1Mbps, etc). * - * Return: The throughput towards the given neighbour in multiples of 100kpbs - * (a value of '1' equals to 0.1Mbps, '10' equals 1Mbps, etc). + * Return: true when value behind @pthroughput was set */ -static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh) +static bool batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh, + u32 *pthroughput) { struct batadv_hard_iface *hard_iface = neigh->if_incoming; struct net_device *soft_iface = hard_iface->soft_iface; @@ -76,14 +78,16 @@ static u32 batadv_v_elp_get_throughput(s * batman-adv interface */ if (!soft_iface) - return BATADV_THROUGHPUT_DEFAULT_VALUE; + return false;
/* if the user specified a customised value for this interface, then * return it directly */ throughput = atomic_read(&hard_iface->bat_v.throughput_override); - if (throughput != 0) - return throughput; + if (throughput != 0) { + *pthroughput = throughput; + return true; + }
/* if this is a wireless device, then ask its throughput through * cfg80211 API @@ -110,14 +114,16 @@ static u32 batadv_v_elp_get_throughput(s * possible to delete this neighbor. For now set * the throughput metric to 0. */ - return 0; + *pthroughput = 0; + return true; } if (ret) goto default_throughput; if (!(sinfo.filled & BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT))) goto default_throughput;
- return sinfo.expected_throughput / 100; + *pthroughput = sinfo.expected_throughput / 100; + return true; }
/* if not a wifi interface, check if this device provides data via @@ -135,8 +141,10 @@ static u32 batadv_v_elp_get_throughput(s hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX;
throughput = link_settings.base.speed; - if (throughput && throughput != SPEED_UNKNOWN) - return throughput * 10; + if (throughput && throughput != SPEED_UNKNOWN) { + *pthroughput = throughput * 10; + return true; + } }
default_throughput: @@ -150,7 +158,8 @@ default_throughput: }
/* if none of the above cases apply, return the base_throughput */ - return BATADV_THROUGHPUT_DEFAULT_VALUE; + *pthroughput = BATADV_THROUGHPUT_DEFAULT_VALUE; + return true; }
/** @@ -162,15 +171,21 @@ void batadv_v_elp_throughput_metric_upda { struct batadv_hardif_neigh_node_bat_v *neigh_bat_v; struct batadv_hardif_neigh_node *neigh; + u32 throughput; + bool valid;
neigh_bat_v = container_of(work, struct batadv_hardif_neigh_node_bat_v, metric_work); neigh = container_of(neigh_bat_v, struct batadv_hardif_neigh_node, bat_v);
- ewma_throughput_add(&neigh->bat_v.throughput, - batadv_v_elp_get_throughput(neigh)); + valid = batadv_v_elp_get_throughput(neigh, &throughput); + if (!valid) + goto put_neigh; + + ewma_throughput_add(&neigh->bat_v.throughput, throughput);
+put_neigh: /* decrement refcounter to balance increment performed before scheduling * this task */