From 76c939832aa95f6e0e84f173b36906eea2235cee Mon Sep 17 00:00:00 2001 From: Ben Greear Date: Wed, 30 Apr 2014 12:02:05 -0700 Subject: [PATCH] ath9k: Prevent divide-by-zero upon bad beacon_interval. A similar patch fixed crashes seen on an ath9k system when testing against a broken ath10k AP. This patch is slightly less protective, but probably will do the job and is less redundant. Signed-off-by: Ben Greear Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/beacon.c | 5 +++-- drivers/net/wireless/ath/ath9k/recv.c | 4 ++-- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c index bd9e634879e6..e387f0b2954a 100644 --- a/drivers/net/wireless/ath/ath9k/beacon.c +++ b/drivers/net/wireless/ath/ath9k/beacon.c @@ -537,8 +537,6 @@ static void ath9k_cache_beacon_config(struct ath_softc *sc, cur_conf->dtim_period = bss_conf->dtim_period; cur_conf->dtim_count = 1; cur_conf->ibss_creator = bss_conf->ibss_creator; - cur_conf->bmiss_timeout = - ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; /* * It looks like mac80211 may end up using beacon interval of zero in @@ -549,6 +547,9 @@ static void ath9k_cache_beacon_config(struct ath_softc *sc, if (cur_conf->beacon_interval == 0) cur_conf->beacon_interval = 100; + cur_conf->bmiss_timeout = + ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; + /* * We don't parse dtim period from mac80211 during the driver * initialization as it breaks association with hidden-ssid diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c index a01efd3e741e..a1fac6bdbb04 100644 --- a/drivers/net/wireless/ath/ath9k/recv.c +++ b/drivers/net/wireless/ath/ath9k/recv.c @@ -538,8 +538,8 @@ static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb) sc->ps_flags &= ~PS_BEACON_SYNC; ath_dbg(common, PS, "Reconfigure beacon timers based on synchronized timestamp\n"); - ath9k_set_beacon(sc); - + if (!(WARN_ON_ONCE(sc->cur_beacon_conf.beacon_interval == 0))) + ath9k_set_beacon(sc); if (sc->p2p_ps_vif) ath9k_update_p2p_ps(sc, sc->p2p_ps_vif->vif); } -- 2.30.2