From 9b5bd5a4917eeb5eca00d1842a74186cfc8dd1c6 Mon Sep 17 00:00:00 2001 From: Ben Greear Date: Wed, 20 Feb 2013 09:41:08 -0800 Subject: mac80211: stop timers before canceling work items Re-order the quiesce code so that timers are always stopped before work-items are flushed. This was not the problem I saw, but I think it may still be more correct. Signed-off-by: Ben Greear Signed-off-by: Johannes Berg --- net/mac80211/mlme.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) (limited to 'net/mac80211') diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 9f6464f3e05f..6044c6d87e4c 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -3502,6 +3502,14 @@ void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; + /* + * Stop timers before deleting work items, as timers + * could race and re-add the work-items. They will be + * re-established on connection. + */ + del_timer_sync(&ifmgd->conn_mon_timer); + del_timer_sync(&ifmgd->bcn_mon_timer); + /* * we need to use atomic bitops for the running bits * only because both timers might fire at the same @@ -3516,13 +3524,9 @@ void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) if (del_timer_sync(&ifmgd->timer)) set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); - cancel_work_sync(&ifmgd->chswitch_work); if (del_timer_sync(&ifmgd->chswitch_timer)) set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); - - /* these will just be re-established on connection */ - del_timer_sync(&ifmgd->conn_mon_timer); - del_timer_sync(&ifmgd->bcn_mon_timer); + cancel_work_sync(&ifmgd->chswitch_work); } void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) -- cgit v1.2.3 From 499218595a2e8296b7492af32fcca141b7b8184a Mon Sep 17 00:00:00 2001 From: Ben Greear Date: Wed, 20 Feb 2013 09:41:09 -0800 Subject: mac80211: Fix crash due to un-canceled work-items Some mlme work structs are not cancelled on disassociation nor interface deletion, which leads to them running after the memory has been freed There is not a clean way to cancel these in the disassociation logic because they must be canceled outside of the ifmgd->mtx lock, so just cancel them in mgd_stop logic that tears down the station. This fixes the crashes we see in 3.7.9+. The crash stack trace itself isn't so helpful, but this warning gives more useful info: WARNING: at /home/greearb/git/linux-3.7.dev.y/lib/debugobjects.c:261 debug_print_object+0x7c/0x8d() ODEBUG: free active (active state 0) object type: work_struct hint: ieee80211_sta_monitor_work+0x0/0x14 [mac80211] Modules linked in: [...] Pid: 14743, comm: iw Tainted: G C O 3.7.9+ #11 Call Trace: [] warn_slowpath_common+0x80/0x98 [] warn_slowpath_fmt+0x41/0x43 [] debug_print_object+0x7c/0x8d [] debug_check_no_obj_freed+0x95/0x1c3 [] slab_free_hook+0x70/0x79 [] kfree+0x62/0xb7 [] netdev_release+0x39/0x3e [] device_release+0x52/0x8a [] kobject_release+0x121/0x158 [] kobject_put+0x4c/0x50 [] netdev_run_todo+0x25c/0x27e Cc: stable@vger.kernel.org Signed-off-by: Ben Greear Signed-off-by: Johannes Berg --- net/mac80211/mlme.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'net/mac80211') diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 6044c6d87e4c..b756d2924690 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -4319,6 +4319,17 @@ void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; + /* + * Make sure some work items will not run after this, + * they will not do anything but might not have been + * cancelled when disconnecting. + */ + cancel_work_sync(&ifmgd->monitor_work); + cancel_work_sync(&ifmgd->beacon_connection_loss_work); + cancel_work_sync(&ifmgd->request_smps_work); + cancel_work_sync(&ifmgd->csa_connection_drop_work); + cancel_work_sync(&ifmgd->chswitch_work); + mutex_lock(&ifmgd->mtx); if (ifmgd->assoc_data) ieee80211_destroy_assoc_data(sdata, false); -- cgit v1.2.3 From feda30271e5455394c57e35eba66db88d1b15077 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 28 Feb 2013 09:59:22 +0100 Subject: mac80211: really fix monitor mode channel reporting After Felix's patch it was still broken in case you used more than just a single monitor interface. Fix it better now. Reported-by: Sujith Manoharan Tested-by: Sujith Manoharan Signed-off-by: Johannes Berg --- net/mac80211/cfg.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) (limited to 'net/mac80211') diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 808f5fcd1ced..fb306814576a 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -3290,14 +3290,19 @@ static int ieee80211_cfg_get_channel(struct wiphy *wiphy, int ret = -ENODATA; rcu_read_lock(); - if (local->use_chanctx) { - chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); - if (chanctx_conf) { - *chandef = chanctx_conf->def; - ret = 0; - } - } else if (local->open_count == local->monitors) { - *chandef = local->monitor_chandef; + chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); + if (chanctx_conf) { + *chandef = chanctx_conf->def; + ret = 0; + } else if (local->open_count > 0 && + local->open_count == local->monitors && + sdata->vif.type == NL80211_IFTYPE_MONITOR) { + if (local->use_chanctx) + *chandef = local->monitor_chandef; + else + cfg80211_chandef_create(chandef, + local->_oper_channel, + local->_oper_channel_type); ret = 0; } rcu_read_unlock(); -- cgit v1.2.3 From 7cbf9d017dbb5e3276de7d527925d42d4c11e732 Mon Sep 17 00:00:00 2001 From: Marco Porsch Date: Fri, 1 Mar 2013 16:01:18 +0100 Subject: mac80211: fix oops on mesh PS broadcast forwarding Introduced with de74a1d9032f4d37ea453ad2a647e1aff4cd2591 "mac80211: fix WPA with VLAN on AP side with ps-sta". Apparently overwrites the sdata pointer with non-valid data in the case of mesh. Fix this by checking for IFTYPE_AP_VLAN. Signed-off-by: Marco Porsch Signed-off-by: Johannes Berg --- net/mac80211/tx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net/mac80211') diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index c592a413bad9..0d74f2459585 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -2755,7 +2755,8 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw, cpu_to_le16(IEEE80211_FCTL_MOREDATA); } - sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); + if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) + sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); if (!ieee80211_tx_prepare(sdata, &tx, skb)) break; dev_kfree_skb_any(skb); -- cgit v1.2.3 From 24af717c35189f7a83c34e637256ccb7295a617b Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 1 Mar 2013 17:33:18 +0100 Subject: mac80211: fix VHT MCS calculation The VHT MCSes we advertise to the AP were supposed to be restricted to the AP, but due to a bug in the logic mac80211 will advertise rates to the AP that aren't even supported by the local device. To fix this skip any adjustment if the NSS isn't supported at all. Signed-off-by: Johannes Berg --- net/mac80211/mlme.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'net/mac80211') diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index b756d2924690..141577412d84 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -647,6 +647,9 @@ static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata, our_mcs = (le16_to_cpu(vht_cap.vht_mcs.rx_mcs_map) & mask) >> shift; + if (our_mcs == IEEE80211_VHT_MCS_NOT_SUPPORTED) + continue; + switch (ap_mcs) { default: if (our_mcs <= ap_mcs) -- cgit v1.2.3 From 801d929ca7d935ee199fd61d8ef914f51e892270 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sat, 2 Mar 2013 19:05:47 +0100 Subject: mac80211: another fix for idle handling in monitor mode When setting a monitor interface up or down, the idle state needs to be recalculated, otherwise the hardware will just stay in its previous idle state. Signed-off-by: Felix Fietkau Signed-off-by: Johannes Berg --- net/mac80211/iface.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'net/mac80211') diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 640afab304d7..baaa8608e52d 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -541,6 +541,9 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) ieee80211_adjust_monitor_flags(sdata, 1); ieee80211_configure_filter(local); + mutex_lock(&local->mtx); + ieee80211_recalc_idle(local); + mutex_unlock(&local->mtx); netif_carrier_on(dev); break; @@ -812,6 +815,9 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, ieee80211_adjust_monitor_flags(sdata, -1); ieee80211_configure_filter(local); + mutex_lock(&local->mtx); + ieee80211_recalc_idle(local); + mutex_unlock(&local->mtx); break; case NL80211_IFTYPE_P2P_DEVICE: /* relies on synchronize_rcu() below */ -- cgit v1.2.3