From 81b4e44e41e651735dd185f78a8fe2f4d53c61d4 Mon Sep 17 00:00:00 2001 From: Sara Sharon Date: Mon, 17 Dec 2018 14:27:51 +0200 Subject: [PATCH] iwlwifi: mvm: track changes in beacon count during channel switch There are some buggy APs that keeps changing the count while forcing us to block TX. This eventually results in queue hang, assert, and disconnection. Detect such APs and disconnect gracefully in advance. Signed-off-by: Sara Sharon Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 15 +++++++++++++++ drivers/net/wireless/intel/iwlwifi/mvm/mvm.h | 2 ++ 2 files changed, 17 insertions(+) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c index af71e58bdd24..e18b57c84dd2 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c @@ -4662,6 +4662,9 @@ static int iwl_mvm_pre_channel_switch(struct ieee80211_hw *hw, iwl_mvm_schedule_csa_period(mvm, vif, vif->bss_conf.beacon_int, apply_time); + + mvmvif->csa_count = chsw->count; + mvmvif->csa_misbehave = false; break; default: break; @@ -4700,6 +4703,18 @@ static void iwl_mvm_channel_switch_rx_beacon(struct ieee80211_hw *hw, if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_CS_MODIFY)) return; + if (chsw->count >= mvmvif->csa_count && chsw->block_tx) { + if (mvmvif->csa_misbehave) { + /* Second time, give up on this AP*/ + iwl_mvm_abort_channel_switch(hw, vif); + ieee80211_chswitch_done(vif, false); + mvmvif->csa_misbehave = false; + return; + } + mvmvif->csa_misbehave = true; + } + mvmvif->csa_count = chsw->count; + IWL_DEBUG_MAC80211(mvm, "Modify CSA on mac %d\n", mvmvif->id); WARN_ON(iwl_mvm_send_cmd_pdu(mvm, diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h index 79d7fcb95b6f..4e179e69fd32 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h @@ -490,6 +490,8 @@ struct iwl_mvm_vif { bool csa_countdown; bool csa_failed; u16 csa_target_freq; + u16 csa_count; + u16 csa_misbehave; struct delayed_work csa_work; /* Indicates that we are waiting for a beacon on a new channel */ -- 2.30.2